Quote:
Originally Posted by calvin-c
If my HVAC is working properly then it maintains the temperature where I set it-so I rarely change it.
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Yep. And imagine if one left one's home for more than a few days. An extended family visit, or per chance even a vacation. Could you imagine someone in that situation setting their properly working HVAC to a more efficient--less comfortable--setting while they were gone? If so, then it shouldn't be that much of stretch to imagine the joy it might give someone to be able to gradually bring their home to a more comfortable temperature on the drive/flight back, so so they don't have to come home to a chilly or sweltering house.