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best fan settings in winter?

Posted by cindywhitall (My Page) on
Tue, Nov 6, 12 at 0:16

While reading a cost comparison between using a space heater in a basement, or running the hvac fan in "on" somebody posted the settings they use to help keep even temps between first and second floor. Didn't see a clear answer as to the electric cost of running the fan in "on" vs "auto" or whether it ages the motor faster.

They wrote (OLD post) to a poster: "Glad to hear that you do notice that it helps to keep the fan on.

If you get to the point where you don't like switching the fan and off all the time. Upgrade to a new t-stat like Honeywell VisionPro. You can program the blower to come on, or to Auto, or to Circ.

I have the above t-stat, and I program mine to do the stuff below.

-7am 68, fan ON
-8am 60, fan ON
-5pm 68, fan ON
-10pm 60, Fan Circ

Summer, I leave the temp at 76 at all times, and only run fan in AUTO in the day, and Circ at night. "

Does this make good sense? So far my temps are pretty even but it hasn't been that cold yet. I didn't have these options on my old stat so I don't know what works best.


Follow-Up Postings:

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RE: best fan settings in winter?

With the variable speed and X13 blower motors the amount of energy used to circulate air is minimal. I would not run any fan on the regular 'high' stat calling for heat for circulation. I run mine in circulate mode in the winter and in auto in the summer purely because circulate tends to keep the humidity higher in the summer. In the winter I run a pellet stove in the basement when it gets stupid cold so the circulate mode helps bring more of that heat upstairs but also aids in pulling moisture out of the humidifier.

With a newer system to me it is just comfort based as some houses will have more even temps with circulation and others it doesn't make a huge difference.


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RE: best fan settings in winter?

In Winter running the airhandler fan full time will produce air flow that will feel cold except when the heat source is actually supplying heat. Easy enough for your to confirm for yourself.


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RE: best fan settings in winter?

The cost of keeping a fan running in the winter isn't just the electricity used, countryboy.

In many houses, ducts and/or furnaces are in unconditioned spaces (attics, crawlspaces, garages, etc). The air running through the system will lose heat and so will cause the furnace to cycle more frequently. Also, houses with leaky supply ducts (which so many have) will be under negative pressure and so will suck in cold outside air while the fan is running.


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