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Joist Space Storage
Don't waste all that space between joists in a basement or garage. Screw wire shelving to the underside of the joists. An 8-ft. x 16-in. length of wire shelving and a pack of plastic clips (sold separately) costs about 20 bucks. Don't forget that wire shelving also shines on walls. Learn the best practices for installing wire shelving here.
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Seal Outlets and Ceiling Boxes
The tiny gaps around outlets on exterior walls and ceiling boxes let cold air in (and warm air out). Sealing these areas takes just half a day and will help cut down on drafts (and your heating bill!).