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Heat temperature issues with Goodman GMP 100-4 furnace

Hi-
The problem that i am having is that the furnace blows around 92 degree air. It cycling and getting my thermostat to temperature. I have extra thermometers sitting all around my house and i have confirmed that i have about a 3 degree temperature drop from shoulder level thermostat to floor. When i raise the temp on the thermostat the furnace will blow much warmer air(around 130 or so) until it gets the thermostat there and then cycle off. Then the cycling from there on to hold that temperature goes back to the cooler air unless i raise the temperature so more. When that cooler air i can never get from about waist down to heat up. It always does heat up when that warmer air is blowing, but it doesn't do it everytime the furnace comes on, only when i raise the temp. Hope this makes sense to someone. I have only been told by a professional that my unit is undersized. They said it is 69,000 btu's. My house is 2000 square feet of conditioned space. I use propane and propane alone is costing $300 per month and i am still not comfortable. Thanks so much for your time.
Kathy

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69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.

Posted on Feb 21, 2009

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Posted on Jan 02, 2017

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