1. Shorten your dryer-vent hose. First, disconnect it and vacuum it out. Then trim the hose length so that it's just long enough for you to pull the dryer a few feet out from the wall. A short and unobstructed line makes your dryer run more efficiently. Cost: Free. Savings: $25 a year on electric, gas, or propane. Bonus: Your clothes will dry about 20 percent faster.