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Replace the Furnace Filter
One of the fastest ways to create problems with a forced-air heating and cooling system is to forget to replace the filter. Locate the furnace filter and buy replacements if the previous owners didn't leave you a stash. Replace the filter (and get in the habit of doing it every month). Here's how!
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Protect the A/C Compressor or Risk Damage From a Falling Icicle
There's no reason to wrap your entire air conditioner for the winter, and many manufacturers advise against it because it can invite rodents and cause condensation, which can lead to early corrosion. But it's not a bad idea to set a piece of plywood on top of the unit to protect it from falling icicles. And see our maintenance guide to learn how to clean your air conditioners in the spring.