***Official 2022 Weather Thread***

MeanDean

Well-Known Member
SuperFanatic
Jan 5, 2009
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Blue Grass IA-Jensen Beach FL
How does everyone handle their thermostat in extreme cold like this? I typically drop mine to 58 while I'm at work and then fire it up about 30 minutes before I head home. I see mixed opinions on whether or not that is actually an efficient method to reduce cost.
Yes, that's a savings. The more the temperature difference between inside and outside the more you have to heat (or A/C) in the summer. Your furnace will run less during the day versus how hard it will work to bring it back up to temperature. This assumes you're gone for a while so the 58 degree setting is in place for a bit.
 

AgronAlum

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Jul 12, 2014
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I Don’t want to start an endless debate on this, but that’s not how it works. I’ll try to simplify this as much as possible

Your house has a certain amount of “heat loss” or leakage. The greater the temperature difference between the outside and the inside (delta T in nerd terms..) the greater that leakage or heat loss becomes. So, as the two temperatures (inside and outside) get closer, your furnace has to run less to maintain that temperature.

So out of curiosity, how does a concrete floor holding temperature at a way higher rate than the rest of the house factor in? It’ll sit and radiate cold air for days if you let it cool down.
 

herbicide

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SuperFanatic
SuperFanatic T2
Mar 23, 2006
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Ankeny, IA
So out of curiosity, how does a concrete floor holding temperature at a way higher rate than the rest of the house factor in? It’ll sit and radiate cold air for days if you let it cool down.
Think of it as a reservoir. Whatever you take out you have to put back in. But the rules still apply, it just takes longer (more energy) to change temperatures; it also slows down the change in the room itself.

In simple terms in the big picture it doesn’t have a net effect on the heating bill; the temperature changes just take more time, both up and down.