Green Tip of the Day

Spend a lot less time twiddling knobs. Install a programmable thermostat to automatically use less A/C or heat while you're at work and asleep, and combat sky-high energy costs.

Installing a digital, programmable thermostat in your home will avert about 1,800 pounds of air-polluting CO2 per year (and they're mercury-free, unlike old-school types). Expect to save about $150 per year on energy bills.

Check this handy site that walks you through installation in seven steps.