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Heating blowing coo air downstairs and warm upstairs?

We have a 2 story house with 2258 sq. feet. There are laminate floors in the entire downstairs and carpet upstairs. We have 1 honeywell thermostate that is located in the hallway of the upstairs. The vents downstairs blow cool air? If you come from outside, it does feel fairly warm on the main level but when you go upstairs, it is much warmer.

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Some of this depends on where the air handler/furnace is located. Most often in two story houses, it's in the attic upstairs, or in a closet upstairs. A duct routes air from the furnace to the downstairs supply duct, so it is a distance from the air handler.
When the unit first initiates a heating cycle, that duct is going to be full of cool air, and the duct itself will be cool. So the furnace has to run long enough to push the cool air out, as well as warm the duct up, before your going to feel warm air at the registers downstairs.

Keep in mind, heat rises. And, your thermostat only monitors the immediate area where it's located. In your case, upstairs.
Two story houses are problematic because of this. And one way around it is to have a damper system installed that distributes the air upstairs or downstairs based on a thermostat located in those spaces. There would be 2 dampers, and 2 thermostats (one upstairs, one downstairs). Each stat would control a damper, and the call for heat or cooling.

Let me know if you would like to consider a system like this, and I can point you to components to use. I've put several system like this in.

Posted on Jan 27, 2009

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