Many homeowners tend to flip the switch over to emergency heat when they feel temps below 90f coming from the registers or notice the unit running almost constantly. Variable speed blowers solve a lot of the low discharge temp issues since they can ramp up slowly and keep the outlet temp at optimum level. If they didn't charge such a price premium for them... You could also install a time delay/coil thermostat/head pressure switch on a conventional air handler to help with "cold blast".
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