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Old 02-04-2013, 05:42 PM
 
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Does this seem odd, or normal.

When I turn my thermostat down to a lower temperature, instead of the fan shutting off until that lower temperature is reached, and then the heat turning back on, my thermostat just continually blows cooler air. So my HVAC constantly either blows warm air or cold air.

My utility bill doesn't seem any higher, but this just doesn't seem normal. Most other places, changing the temperature makes the air stop blowing until the home temperature is below the chosen temperature.
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Old 02-04-2013, 05:56 PM
 
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I am not understanding the problem or the symptoms

Are you saying when the heat is turned down to the lowest temperature the fan keeps running?
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Old 02-04-2013, 06:19 PM
 
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My fan has a manual switch ON the thermostat - but having said that I keep that switch turned ON all the time; if it were turned off, the fan cycles on and off with a slight hysteresis as needed by the current AC - either heat or cold (or neither).
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Old 02-04-2013, 06:31 PM
 
Location: Alexandria, VA
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Is it an older thermostat? There is an option for Auto and On - you should have it on Auto
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Old 02-04-2013, 06:33 PM
 
Location: Somewhere in northern Alabama
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Could also be a stuck contactor. $15 part $100 service call.
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Old 02-04-2013, 06:38 PM
 
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If the fan keeps running only when you turn the heat down then it is most likley the fan control.

It is usually a cheap little klixon disc that turns the fan on after the heat warms things up so there is no draft.

If it sticks the fan keeps running .
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Old 02-04-2013, 07:54 PM
 
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Yes, only when the heat is turned down. A couple of nights ago it was extremely hot in the middle of the night. We turned the thermostat down, but the fan never stopped, it just started blowing cooler air to cool down the house. It is an older thermostat with the options of "Fan" and "Auto on". It's currently set to Auto on.

From my recollection if you turned the temperature down, the fan would stop, the house would cool down, and then the heat would turn on to regulate the temperature.
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Old 02-05-2013, 02:09 AM
 
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fan control is acting up i bet.
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Old 02-05-2013, 04:43 AM
 
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Quote:
Originally Posted by Jeepchic View Post
It is an older thermostat with the options of "Fan" and "Auto on". It's currently set to Auto on.
That is what ours is, too - and we keep it set to "Fan".

Other than power outages (really rare in our neighborhood) and filter changes, that fan has been ON for about 10 years now.

Last edited by sullyguy; 02-05-2013 at 05:45 AM.. Reason: Changed misleading "ON" to "Fan"
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Old 02-05-2013, 02:49 PM
 
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Quote:
Originally Posted by sullyguy View Post
That is what ours is, too - and we keep it set to "Fan".

Other than power outages (really rare in our neighborhood) and filter changes, that fan has been ON for about 10 years now.
A continous fan operation can be desirable in cooling for the air motion but don't you feel a draft in heating season? I've never heard of anyone operating their fan like that.
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