30 Down-and-Dirty Tricks for Big DIY Savings

Ventilate your roof to help cool your home in the summer and prevent ice dams in the winter. Do this by installing intake vents and a solar-powered fan (you may need two, depending on your roof size) that draw out warm air trapped in the attic.

Cost: Systems start at $250.

Savings: In Texas, for instance, where the average annual cost to operate a central-air unit is $668, fan makers claim you can save 30 percent on your operating costs, or $200 per year.

Bonus: You may be eligible for federal and/or state tax rebates to help cover the cost of your setup.