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50 Super Simple Ways to Save on Energy Costs

Watch your utility bills drop with these smart (and easy!) energy saving projects you can DIY.

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Air Leak Testing & Sealing

Do Air Leak Testing & Sealing

Follow these surprisingly easy tips and techniques for sealing air leaks in your home and save big money on your heating and cooling bills. Learn about air leak testing and sealing.

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Family Handyman

Seal Attic Air Leaks


Small air leaks into uninsulated attic space are a major source of heat loss in many homes. Here’s how to locate the leak spots and plug them without spending a lot of money. Learn how to seal attic air leaks.

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Use a High-Tech Thermostat


If you want to save money by setting back your thermostat at night, use a two-stage thermostat on a two-stage furnace. Learn how to save money with a high-tech thermostat.

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Family Handyman

Insulate Crawl Space Ducts


Leaky, uninsulated ducts in crawlspaces and attics waste huge amounts of energy and money. Use duct wrap insulation for a quick fix with a big, immediate payoff. Learn how to insulate crawl space ducts.

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Family Handyman

Close Heat Registers


It seems like a waste to heat unused rooms, but closing heat registers may actually increase heating costs, especially with newer systems. Learn how to save energy by closing heat registers.

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Insulating Walls

Insulate Walls


Get the most energy efficiency from your insulation by filling all gaps, avoiding compression, sealing holes in framing and other expert tips. Even small gaps can reduce efficiency as much as 25 percent. Learn all about insulating walls.

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Family Handyman

Use Less Hot Water


Here’s a tip that could save you big money on utility bills. If you’re washing and rinsing your clothes in hot water, you’re wasting a chunk of change heating all that water. The juice needed to power the machine motor doesn’t cost much—the big expense is heating all that water. Detergents are designed to perform in temps of 65 to 85 degrees F. And cold water is just as effective for rinsing as warm or hot. So dial back those temperature settings! Check the water temperature in the tub right after it fills. You just might find that even the cold setting on the washing cycle is above 65 degrees and no hot water is even needed. Just make sure you never put one of these 11 things in the washing machine.

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hot water heater timerPhoto: You Touch Pix of EuToch/Shutterstock

Use a Water Heater Timer

This device allows you to program the times when your water heater activates and deactivates during a 24-hour period. Each household is different and you must determine, based on your hot water use, if a timer is right for you. Better yet, check out these amazing tech tools for the home, including one that will allow you to shut off the water at home.

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Weather-strippingFamily Handyman

Use Weatherstripping

If you can see light creeping beneath exterior doors, air is also escaping. Grab a few packages of self-adhesive rubber foam weatherstripping and go to town, sealing any and all doors that lead outside. Weatherstripping already installed but you’re still suffering from a high gas bill? It might be time to replace the strips installed by the previous owners. Check out this handy tutorial on installing weatherstripping.

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dfh5_shutterstock_73233349 change furnace filterSerenethos/Shutterstock

Change Furnace Filter Regularly

Homeowners should change their furnace filters once a month, according to experts. And changing the filter regularly not only helps extend the life of your furnace, it helps with air quality in your home and keeps energy costs down.

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clothes line air dryAfrica Studio/Shutterstock

Use a Clothesline

A simple clothesline allows you to dry your clothes for free using the power of the sun instead of expensive electricity. Electric clothes dryers can really put a dent in your pocketbook (up to $85 a year in electricity costs), especially if you have a large household. While a clothesline does require a bit of manual labor to hang the clothes, you will enjoy a fresh, natural smell in your laundry as well as a reduced utility bill.

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HVACDavid Spates/Shutterstock

Try Using a Ductless Mini Split HVAC System

When it is time to replace your HVAC system, consider switching to a ductless mini split. The super-efficient systems require less labor during installation, do not require air ducts and allow you to cool/heat your home in zones instead of the entire house. This can have a profound effect on your energy costs in a good way. See 10 other clever ways to save money on energy costs.

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repair-and-reglaze-window

Reglaze Windows

Instead of forking over $5,000-10,000 to replace all of your old windows with brand new ones, consider repairing old windows yourself. With a few hundred dollars in supplies (sand paper, paint, window glaze, etc.), you’ll be prepared to reglaze every window in your house. Though it can be a tad time consuming, you can prioritize the project by room, removing windows one by one to paint, reglaze, and, if necessary, replace any cracked glass. Get started glazing your windows here.

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energy efficient lightbulbfixer00/Shutterstock

Use Energy Star Products

According to energystar.gov, folks saved upwards of $30 million on their utility bills and helped to reduce greenhouse gases by using Energy Star-rated products. These super-efficient products include CFL and LED light bulbs, household appliances, building materials such as windows and doors and HVAC equipment among many others. Not only is switching to Energy Star products one of the best frugal living tips, but it also allows you take advantage of their energy savings and may qualify you for the Residential Renewable Energy Tax Credit.

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Family Handyman

Switch to CFL Bulbs

CFL bulbs will provide 10,000 hours of light and use $10.40 of electricity (at 8 cents per kilowatt hour). To get the same output with incandescents, you would have to use seven bulbs, which would cost less up front, but the electricity would cost $48. Check out our guide to CFLs so you know what you’re getting into.

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Family Handyman

Add Smarter Switches to Lights

Install smarter switches and save up to $100 a year. Motion sensors are the perfect solution for left-on lights. They turn off automatically so you don’t waste electricity. Motion sensors are great for home security but do you know the secrets a home security installer won’t tell you?

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noisy air conditioner fixFamily Handyman

Maintain the A/C

The best way to keep your air conditioner running at peak efficiency is to spend a couple of hours each year on basic maintenance—cleaning and straightening the fins, changing the filter and lubricating the motor.

Roughly half of an average home’s annual energy bill (gas and electric), about $1,000, is spent on heating and cooling. Air conditioners placed in direct sunlight use up to 10 percent more electricity. If yours sits in the sun, plant tall shrubs or shade trees nearby—but don’t enclose the unit or impede the airflow. Place window units on the north side of the house or install an awning over them. Check out these 21 air conditioner maintenance and home cooling tips.

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Electricity surge protectorFamily Handyman

Plug in Electronics into a Power Strip

Electronics guzzle lots of power even when they’re turned off. Stop wasting electricity: Plug them into a power strip, then turn off the strip.

Seventy-five percent of the electrical use by home electronics occurs when they’re turned off, according to the Department of Energy. These “energy vampires” suck electricity all day long—costing you an extra $100 each year. So if you’d like to keep that Ben Franklin in your wallet, unplug your electronics or plug them into a power strip, then turn off the strip.

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Family Handyman

Clean the Dryer Duct

A clogged lint screen or dryer duct drastically reduces the efficiency of your dryer, whether it’s gas or electric. Clean the lint screen after each load and clean the exhaust duct once a year. The cleaner shown here has an auger brush that attaches to a drill to clean out the ducts. It’s available at home centers.

Electric dryers use about $85 of electricity annually. A dirty lint screen can cause the dryer to use up to 30 percent more electricity ($25 per year), according to the Consumer Energy Center. Lint buildup is also a common cause of fires.

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Family Handyman

Drain the Water Heater

To make your water heater even more efficient, drain the tank and flush out the sediment at the bottom. Otherwise, you could be heating through inches of sediment before heating the water.

If your electric water heater is warm or hot to the touch, it’s losing heat. Wrap it with an insulating blanket (sold at home centers). Sick of a bulky water heater, try investing in a tankless water heater.

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Family Handyman

Try Smart Metering

Smart metering programs vary among utility companies, but the basic idea is the same: The utility installs a special “smart” meter that tracks how much electricity you’re using. The utility uses that data to make sure its power grid doesn’t get overloaded and cause blackouts. If the grid nears capacity, the utility can shut off major appliances in homes for short periods of time (such as 15 minutes per hour). Not all companies offer smart metering, but some do and many others are considering it.

What’s in it for you? Money! Some programs pay for signing up. Others let you view your home’s usage online in real time so you can better manage your electrical consumption. Others let you choose “real-time” or “time-of-use” pricing that allows you to pay less for electricity that’s used during off-peak hours (for example, on weekdays from early afternoon until 8 p.m.). These plans reward you for using electricity when it’s cheapest. Smart metering makes the most sense if you’re away from home all day—you won’t notice or care if things get turned off (although it’s a good idea for everyone else too!). According to SRP, a power utility company, the plans cut 7 percent off your bill, which is $140 for the average $2,000 yearly energy bill. Check with your local company to find out what smart metering programs are available in your area. Make sure you’re protecting your electronics properly with these tips.

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clean-refrigerator coils

Clean Refrigerator Coils

Refrigerator condenser coils are located on the back of the fridge or across the bottom. When coils are clogged with dust, pet hair and cobwebs, they can’t efficiently release heat. The result is your compressor works harder and longer than it was designed to, using more energy and shortening the life of your fridge. Clean the coils with a coil-cleaning brush and vacuum. A coil-cleaning brush, which is bendable to fit in tight areas, does a thorough job. Look for one online or at appliance stores. For tips on repairing your refrigerator (without a service call), check out our guide and how to clean each home in the house faster.

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Family Handyman

Seal Up a Seldom-Used Chimney

Fireplace chimneys can be very inefficient, letting your warm inside air disappear like smoke up a chimney. If you have airtight glass doors that seal the opening, you’re in good shape. (The doors are available at fireplace retailers and home centers.) If not, a special balloon or chimney-top damper will get the job done.

For fireplace chimneys that are seldom or never used, inflate a Chimney Balloon inside the chimney to stop the air leaks. Buy it directly from the company. Partially inflate the balloon by mouth or with a pump, then stick it into the chimney and blow it up the rest of the way.

Putting in and taking out the reusable balloon can be messy (here’s when to clean a chimney flue), so you don’t want to hassle with chimney balloons if you regularly use your fireplace. But that doesn’t mean you have to settle for energy loss. Instead, you can install a chimney-top damper system, like the Chim-a-lator, which seals the top of the flue when the chimney’s not in use. A lever in the fireplace controls the damper via a long cable.

Installation involves attaching the damper and screened-in cap to the chimney top, then mounting the lever in the fireplace. If you don’t feel comfortable working on the roof, hire a chimney sweep or mason, who can install the system for you.

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fire within a large stone arched fireplace, with pile of logs and basket of pine kernelsAdamEdwards/Shutterstock

Close a Fireplace

Wood-burning fireplaces can warm up a room, but more often, they rob a house of heat by letting it escape up the chimney. If you have a modern fireplace with a cold air intake from outside, make sure you equip it with an airtight door. If you have an older fireplace that uses room air for combustion, equip it with a door that has operable vents. And only keep those vents open when you have a fire in the fireplace. Otherwise, heat will constantly be sucked out of the house.

Airtight doors have gaskets that seal the doors. They fasten to the masonry opening like other door systems, but they seal the area to keep heated air from leaking up the chimney. Prices start at $700 (yes, that’s a lot compared with the cost of regular doors, which start at about $230). Enter “fireplace doors” in a search engine to find local retailers. One online retailer is fireplacedoorsonline.com. Also consider a chimney-top damper, which stops heat loss.

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Family Handyman

Cover Air Conditioners

A room air conditioner keeps a section of the house cool. The problem is, it’ll keep the room cool all winter long if it isn’t covered properly. If you have a window unit, the best solution is to remove it so the cold air won’t flow through and around it. If you decide to leave it in or you have a permanently installed wall unit, grab some removable caulk and a window air conditioner cover to keep out the cold. And if you have a central air conditioner unit, cleaning it annually can also save you energy and money.

Place the cover over the outside of the air conditioner, fitting the sewn-in corner straps over the bottom corners. Wrap the middle straps under and up the sides of the unit, then hook them over the top. Inside the house, apply removable caulk around the air conditioner where it meets the wall or window. If the air conditioner is a built-in unit, permanently seal it with latex caulk.

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Family Handyman

Add a Flap to the Dryer Vent

Is your laundry room cold in the winter? Cold air might be coming through your dryer vent. The vent should have a flap (or flaps) at the end to stop air infiltration. Go outside and make sure there’s a flap and that it’s not stuck open. If the flap works well, check the caulking. If it’s cracking and peeling away, it’s probably allowing cold air to leak in. Cut away the old caulking, make sure the vent is flush against the siding, and apply new latex caulk.

If the flap doesn’t close on its own, try cleaning it and then spray silicone on the pivot point. If the flap still won’t close, replace it. A new vent costs about $5 at home centers, and installing it will only take about 15 minutes.

Start by cutting away the caulking around the vent on the siding with a utility knife, remove any screws and unclamp the duct leading to the dryer. Slide the old vent out of the wall, slip in the new one and reattach it to the duct. Caulk around the vent flange.

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Family Handyman

Create an Air Barrier on Open Soffits

Builders often put a soffit where they want to put cabinets or recessed light fixtures, and sometimes they use soffits to contain heating ducts. Soffits have a high potential for leakage, especially if they contain recessed lights. Refer to your sketch and dig around in the insulation if necessary to find them. Reflective foil insulation, sometimes called “bubble-pack” insulation, works well as an air barrier for soffits. It’s flexible and only about 1/4 in. thick, making it easy to cut with a scissors. You have to clear insulation from the surrounding wood to get the caulk to stick. Then cover the foil with insulation when you’re finished. However, don’t put insulation within 3 in. of recessed lights unless the fixture is IC rated (for “insulation contact”). The rating will be listed on a label inside the recessed can.

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Family Handyman

Use Storm Windows

Storm windows aren’t new, but they’re definitely improved: New ones open and close and can be left on year-round. Some offer low-emissivity coatings to further cut heat loss. You can use low-e versions even if your windows already have a low-e coating.

You’ll see the biggest payback when they’re used over single-pane windows. But don’t use storm windows over aluminum windows—heat buildup between the two windows can damage the aluminum, and drilling holes for installation can cause leaks.

You can buy or special-order storm windows at home centers, but you may have trouble finding low-e models. Two sources are Menards and Larson Windows and Doors. Storm windows start at $30. Measure the height and width of the window (from the outside) before ordering. Do-it-yourself installation takes about 30 minutes per window.

“Almost half of U.S. homes have single-pane windows. Windows are major sources of heat loss, but low-e storm windows can reduce that heat loss by more than 50 percent.” —Department of Energy.

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Family Handyman

Fill Gaps Around Electrical Boxes

Electrical outlets and switches on exterior walls can leak a lot of cold outside air into the house. Add up all the outlets in the average house and you can have some serious heat loss—which makes it worth spending 10 minutes per outlet plugging the holes.

Before you start, flip the circuit breaker off and use a noncontact voltage tester to ensure there’s no power. Remove the cover plate. If the gap between the electrical box and the drywall is less than 1/4 in., fill it with acrylic latex caulk. If the gap is bigger and lopsided, use foam sealant that’s formulated for use around doors and window framing. The minimally expanding foam won’t drip down your walls. After the foam dries, cut away any that protrudes, add a foam gasket (to reduce drafts through the box) and replace the cover plate. Do the same around register openings on the inside of exterior walls.

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Family Handyman

Fill Gaps Under Sinks

Pull back the escutcheons on plumbing pipes where they enter exterior walls and you’ll probably see generous gaps around the pipes. In cold weather, you might also feel the draft coming in. All it takes is a can of expanding foam to seal those leaks. (You won’t believe these 12 mind-blowing uses for spray foam.)

Shake the can vigorously, then squirt the foam around the pipes inside the wall. Don’t completely fill the gap—the foam will expand. If it expands too much and you can’t get the escutcheon back on, wait for it to dry, then slice it flush with the wall with a utility knife.

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Family Handyman

Use ‘Winter Curtains’

If you’re turning up the heat in the house to compensate for drafty windows, consider quilted curtains, which can increase your comfort and let you keep the temp down. The curtains are available in various colors, patterns and sizes. Enter ‘quilted curtain’ in a search engine to find retailers. Online sources include plowhearth.com and amazon.com. Prices start at under $100, and a curtain can be installed in less than 10 minutes on your existing curtain rod. Learn more here about how “winter curtains” can keep you warm.

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Family Handyman

Seal Small Attic Holes With Foam and Caulk

Hot air rises, so leaks in the ceiling are even worse than leaks in walls. And in many homes, this airflow through ceilings and into the attic is the No. 1 source of heat loss. You can check for leaks around ceiling light fixtures and the attic access door using an incense stick. But the only way to detect other leaks is to crawl up into the attic, pull back the insulation and look for them. Most leaks occur where chimneys and electrical and plumbing lines pass through the ceiling. Although the attic is a nasty place to work, plugging these leaks is a simple project—mostly caulking and foaming gaps.

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Family Handyman

Add a Door Sweep

If you can feel the breeze and see daylight under your entry door, it’s costing you big-time. It also means you need to adjust your door threshold or install a new door sweep. Door sweeps start at $10. The hardest part about replacing them is usually taking off the door.

Start by adjusting the threshold. Newer versions have screws that raise and lower them. Turn all of the threshold screws until the door opens and closes without much drag and any draft is eliminated. If that doesn’t work, or your threshold doesn’t have adjustment screws, replace the door sweep.

Close the door and pop out the hinge pins with a pin punch to remove the door. Set the door on a work surface and remove the old door sweep. Caulk the ends of the door, then install the replacement sweep. Some sweeps are tapped into place and stapled along the door bottom; others are screwed to the side along the door bottom. If a drafty sliding patio door is your problem, here’s how to fix it.

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dfh11_shutterstock_507528532 space heaterYevhen Prozhyrko/Shutterstock

Turn Down the Heat

We all know the mantra by now — turn down the thermostat during the winter months and you’ll save money. And it’s true. According to the Department of Energy, for every degree you lower the thermostat, you’ll save 1 percent on your energy bill. But turning down the heat has a big drawback — you have to wear extra clothes to stay warm. The solution? Use a space heater to stay comfortable in the room where family members gather, like the living room. Fireplaces and fireplace inserts can provide space heating, but electric heaters are the easiest way to warm up a room. Curious about how to install a gas fireplace? Here’s a complete guide.

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Family Handyman

Button Up Hatches and Doors

After sealing the attic bypasses, push the insulation back into place with an old broom handle or a stick as you back out of the attic. Then finish up by sealing the access hatch with self-sticking foam weatherstrip. You may have to add new wood stops to provide a better surface for the weatherstrip and enough room for hook-and-eye fasteners. Position the screw eyes so that you slightly compress the weatherstrip when you latch the hatch. Use a similar procedure if you have a hinged door that leads to the attic.

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Family Handyman

Seal Up Ducts

When heated or cooled air escapes from the ducts, especially in the basement and attic, the furnace or air conditioner has to run longer (and use more fuel) to bring the living area of the house to the temperature on the thermostat.

Our heating expert confessed that he never thought duct leakage was a big issue until he saw a thermographic image showing just how much heat is lost at the duct joints. Today he’s a believer in duct sealing.

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Family Handyman

Patch Up Air Leaks Outside

Look behind any air conditioner compressor or heat exchanger and you’ll find at least one large hole for plumbing and wiring. It’s usually bigger than it needs to be and sometimes only partially plugged with a large wad of electrician’s putty, making it a good spot for heat to get out and mice to get in.

Make these holes more weathertight and less unsightly with a 1-1/2-in. rubber plumbing boot (available for about $4 in the roofing section in home centers).

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Family Handyman

Wrap Pipes With Insulation


Insulating your exposed hot water pipes reduces heat loss and helps deliver hotter water at a lower temperature setting. Insulate all accessible hot water pipes within 3 feet of your water heater using quality pipe insulation or a pipe sleeve. Place the pipe sleeve so the seam is face down on the pipe and use aluminum foil tape to secure the insulation to the pipe every foot or so. On gas water heaters, keep pipe insulation at least 6 inches from the flue.

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removing caulk from window

Opt for Removable Caulk

Removable caulk is a great solution for leaky, energy-wasting windows. It looks a whole lot better than covering windows with plastic film, and you can easily pull it off when springtime rolls around. If you don’t find it at a local home center, just search online for “removable caulk” (about $6 per tube). Don’t use any caulk on bedroom or other windows that may have to be opened quickly to escape a fire. Don’t have a caulk gun? Here’s how to improvise. 

Plus: Why you should caulk your toilet to the floor.

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loose fill attic insulation

Learn How to Insulate an Attic


Learn how to insulate your attic yourself with blown-in cellulose insulation, and start saving money on your utility bills. This step-by-step article walks you through every detail of the job, plus you’ll learn about attic insulation costs.

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Geothermal heatFamily Handyman

Consider Geothermal

A geothermal heat pump can save you so much money in energy costs (while helping the environment) that you will be tempted to install one immediately. However, consider the geothermal heat pump cost because it is expensive to install that you will be tempted to forget the whole thing. Read on to learn about some of the pros and cons of geothermal energy.

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Family Handyman

Research Triple Glazed Windows

If you want to upgrade your old windows, be sure to check out the benefits of triple pane windows as well as double-pane. In cold regions, such as New England, triple-glazed windows can save 2 to 3 percent of your heating bill, compared with double-glazed windows. From a cost standpoint, it’ll take a few decades to recoup the 10 to 15 percent upcharge to go from low-e double-glazed windows to triple-glazed. For example, if you pay $1,000 per year in energy bills, have 20 windows in your house, and 22 percent of your energy is lost through your windows (which is average), then each window is losing $11 worth of energy per year. A triple-glazed window will reduce that loss by about $1, so it’ll take 35 years to cover a $35 upcharge for triple-glazing. Of course, if your energy bills and energy loss are greater, you’ll recoup the cost sooner.

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indoor tankless water heaterVia The Home Depot

Find Out the Pros and Cons of Tankless Water Heaters

A tankless water heaters uses 30 to 50 percent less energy than units with tanks, saving a typical family about $100 or more per year, depending on water usage. Tankless units (also called “on demand” units) heat water only when you turn on the faucet. They usually operate on natural gas or propane. The main advantage is that they eliminate the extra cost of keeping 40 to 50 gallons of water hot in a storage tank, so you waste less energy. They also offer a continuous supply of hot water, which is ideal for filling a big hot tub or a whirlpool. They’re more compact than a standard water heater and mount on a wall.

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atticISTOCK/IRI_SHA

Add a Radiant Barrier to Your Roof Deck or Attic Ceiling

A radiant barrier is a highly reflective material that reflects radiant heat rather than absorbing it. When combined with insulation, “it provides substantially more energy efficiency than anything you can do on the top of the roof like shingles,” Sears Home Services product manager Jim Eldredge says.

Applying a radiant barrier to the underside of the decking helps extend the life of your roof, keeps the decking and attic area cooler and provides additional energy efficiency throughout your house, he explains.

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putting up sidingBonita R. Cheshier/Shutterstock

Replace your home’s siding

“Replacement is the only way to make siding more energy efficient,” Eldredge says. In other words, you can’t really patch up siding to make a significant difference.

“We install a ¾-inch foam insulation behind all of our siding,” he explains, “which helps to make the home more energy efficient.”

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dfh3_shutterstock_433760101 water heater temperaturebrizmaker/Shutterstock

Adjust Your Water Heater Temperature

If your conventional water heater’s temperature is set too high, you could be losing lots of energy keeping that water warm when no one is using it. Take a look at your water heater and use your manual (or search online) to find where the energy efficient temperature dials are, if you don’t already know. Gas water heater tanks tend to have one bottom control, while electric water heaters may have two different sensors to tweak. And turn the temperature setting down to 120 degrees F. And this temperature will still get your clothes and dishes clean.

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dfh4_shutterstock_544153177 open up blinds curtains to let sun inAfrica Studio/Shutterstock

Open Up Your Blinds

A lot of solar energy can pass through standard residential windows. And use that to your advantage! When then sun is out and bright, open up your window coverings and let the solar energy efficient heat in.

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dfh8_shutterstock_255038101 thermostat programKaspars Grinvalds/Shutterstock

Remodel Your HVAC for Zones

If you are really committed to improving energy efficiency, consider installing a zone heating and cooling system. With these systems, you choose which zones of the house to heat and which to leave unheated. And in larger houses in particular, this allows you to save money, since people tend to congregate in only one or two rooms. Note that merely sealing up your vents will not work, since this tends to make your HVAC system work even harder.

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dfh11_shutterstock_422339740 maintain refrigerator temperatureshowcake/Shutterstock

Clean and Maintain Your Refrigerator

If you’re like most people, your refrigerator probably sees a lot of use during the winter holidays, and that can waste a lot of energy. However, you can prep your fridge with a few maintenance tips. First, make sure the refrigerator temperature is around 38-40 degrees F. in most compartments. This is plenty cool enough for most foods. And in refrigerators, spaced-out food stays cool more easily, while in the freezer packing food close together is more energy efficient. You may also want to use a refrigerator calculator to see if you can save money with an upgrade. And always remember that if your refrigerator has coils, keep them free of dust.

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Insulate a Garage Door


Studies done by garage door manufacturers prove that an energy-efficient R-18 insulated garage door can keep your garage about 12 degrees warmer in winter months and about 25 degrees cooler in summer. That reduces energy loss along the insulated walls and ceiling. A new R-18 garage door costs about $1,400 (installed price for a two-car garage), so it really doesn’t pay to replace yours based on energy savings alone. You can, however, add insulation, doorstop weather stripping and a new bottom seal to your existing door to gain some savings and comfort. You can complete the entire job in about four hours for less than $200. Just buy the materials from any home center and gather up a utility knife, tape measure, straightedge, saw, dust mask, and a hammer and nails. Here’s how to do it.