The Hull Truth - Boating and Fishing Forum - View Single Post - Programmable home A/C thermostats
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Old 01-15-2015, 05:06 AM
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Set the cooling up no more than 3*F and the heating no more than 2*F if it's on a heat pump.

Depending on the stat it may have a smart recovery feature that will learn what it takes to heat or cool your house to your desired temperatures and will come on early to achieve your programmed setpoint at the programmed time.

Used properly they can help save money, how much will depend on how you like to heat/cool your home.