Is it fair to say that after upgrading to a York/Coleman/Luxaire modulating furnace previous experience with thermostat setbacks (on a 70% eff) must be unlearned since the modulating unit will not recover very quickly?
100K LP9C furnace Heat Loss est at 17F (Current OD temp) = 52K. Furnace running over 1 hr to raise indoor temp by 2F (Remeber, the furnace only starts at 35% eff so it takes a while before the unit achieves ballance point...)
Is there a general guideline that ballances comfort and efficiency for these newer units during cold spells? Based upon recovery time it seems that the ecconomic cost savings for turning the stat back 4F isn't worth waiting for the house to warm back up in the morning.