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This also can depend on the type of heat you use. A heat pump can take forever to recover temperature and also will force you to use secondary heat. Oil or gas heat can recover much more quickly due to the higher duct temperature. A heat pump with gas or oil secondary heat changes things as well. The 5 to 10 degrees numbers are reasonable. And as Rick noted A/C and humidity control situations are important as well. Normal summer time settings are high 70s to 80 you certainly wouldnt want to allow the house to creep up to 90 during setback modes.
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Kevin
'79 Coupe
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