Why doesn't she satisfy the thermostat?


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Old 01-24-14, 07:50 AM
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Why doesn't she satisfy the thermostat?

RUUD 95+ condensing furnace, about six years old and she has always worked fine. The last few days she will not satisfy the thermostat ( at night I set her at +68 and then when we get up set her at+73). The last few days she is at +69 after about two hours, heat s coming but does not appear to be overly hot (I have a probe thermostat in register to see what temp she was putting out, and it read +125). The only change in my home is I added a room humidifier as our humidity level has been at about 30%, the best I can get is about 45% room and she runs constantly. Would this be affecting the heat output/room temperature?
 
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Old 01-24-14, 08:12 AM
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Does the air flow from the registers seem lower than it has before? Have you checked your filter or started using a different filter than usual?
 
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Old 01-24-14, 08:18 AM
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I was getting ready so delete this post as porn when I saw "she satisfy the thermostat". I was expecting something really weird.

First I would check to make sure that you have a clean, normal furnace filter. The ultra filtration ones being pushed/advertised now can restrict the airflow much more than a standard filter. Not as big a deal with a gas furnace as it is with a heat pump but you still want the best airflow you can get.

Check to make sure all your registers are open and make sure you are getting good airflow from all of them. If you're not getting good flow out of a register it could mean a duct has come loose. Also try to visually inspect your ducts, especially the cold air return for anything disconnected or leaking. The last thing you want with these record cold temps is to be sucking in cold outside air or blowing heated air into your attic or crawl space.
 
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Old 01-24-14, 10:10 AM
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Satisfy Thermostat (no PORN intended).

Mystery solved. My system, one air handler for a two story home, has dampers on the upstairs and downstairs air flow. The upstairs damper had slipped to half open, I closed her to minimal flow UP and all is well. Thanks for the posts.
 
 

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