programmable thermostat
Photo: Ryan Benyi
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Cut Costs With a Programmable Thermostat

Going digital with a model that automatically changes the indoor temperature setting is fairly easy, and it can trim about $180 off your annual heating and cooling costs. Simple models that only control heat are sold at home centers for around $25. But units like the one shown here can handle many more functions, including cooling and humidifying. Typically they're purchased through and installed by HVAC contractors, but you can get a good deal on one by buying online and install it yourself in no time.

Cost: About $475.

See How to Install a Programmable Thermostat for full step-by-step instructions.
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