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Question for OT HVAC engineers

Posted on 1/5/18 at 8:53 pm
Posted by Jim Rockford
Member since May 2011
98367 posts
Posted on 1/5/18 at 8:53 pm
Should you turn the heat down when you're gone all day, or leave the house at a constant temperature?

Same question goes for AC in summer.
Posted by Walt OReilly
Poplarville, MS
Member since Oct 2005
124694 posts
Posted on 1/5/18 at 8:53 pm to
Constant temp

Posted by jamboybarry
Member since Feb 2011
32668 posts
Posted on 1/5/18 at 8:53 pm to
Set a fire while you’re gone so you have that crackling natural warmth when you come back home
Posted by Bullfrog
Institutionalized but Unevaluated
Member since Jul 2010
56442 posts
Posted on 1/5/18 at 9:30 pm to
I get cheaper bills when it doesn’t run while I’m away. FWIW YMMV

ETA: Insulation of the house and quality of the HVAC are big variables.

I have shitty insulation and pretty good and new HVAC.
This post was edited on 1/5/18 at 9:35 pm
Posted by Spankum
Miss-sippi
Member since Jan 2007
56119 posts
Posted on 1/5/18 at 11:08 pm to
It has been proven that lowering the heat while you are away does save money....however, I crunched the numbers and it is just not worth the additional hassle for me, so I don't do it. Probably would be smart for me to buy a thermostat that can do that for me...
Posted by keakar
Member since Jan 2017
30138 posts
Posted on 1/6/18 at 12:24 am to
it takes more energy to bring the house back to temperature then you save by turning it off.

what you should do though is turn it down a little, with a/c turn it up to around 80 during the day while you are at work. it oinly takes about 30 minutes to recool the house as well as walls and furniture (yes they all hold trapped in heat).

it is just the opposite for heating, turn it to 65 while you are at work.

doing this saves money but doesnt waste all the savings of it not running as much, by making the system run for well over an hour to get the temperatures back to normal settings and stop short cycling after shutting off.
Posted by East Coast Band
Member since Nov 2010
62906 posts
Posted on 1/6/18 at 12:30 am to
The only real savings I can see with constant temps and using a heat pump is to try to heat your house during the daylight hours, when the heat pump is more productive and efficient, as opposed to heating it a lot when you get home and it is dark and colder.
This will lead to the auxillary heat coming on as well, which will drive up your power bill.

I can not see the savings benefit in any type "constant" temp using AC, or a gas furnace heater.
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