30 Down-and-Dirty Tricks for Big DIY Savings

Install a shower timer that slows and then shuts off the flow of water after a preset time. Use this to cut your daily showering time from 20 minutes to 10.

Cost: $111 for the automatic timer at The Shower Manager.

Savings: $75 or more a year off your water-heating bill, depending on the type of boiler.

Bonus: Shorter steamy showers mean less moisture-induced mold and mildew.