This seems impossible


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Old 12-26-09, 05:01 PM
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This seems impossible

I have a small cape cod with a single zone forced hot air system. Two of the registers blow cool air, the rest hot air. Since I have air flow from the cool registers, I assume they are not cloggged. Any ideas?
 
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Old 12-26-09, 05:11 PM
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The usual explanation for this is that you got on Santa's "naughty" list.
 
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Old 12-26-09, 05:27 PM
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Is this something that just happened? Or has it always been like that?

And do you have central air conditioning or not?

Where do the ducts run?: In a basement, crawl space, or attic? What is the approx. temp in the area the ducts run? And do all the ducts run in each of thsoe areas, or do some run through a basement, while some run through say a much colder attic or crawl space?

There are explanations, depending on what you say.
 
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Old 12-26-09, 05:33 PM
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Are you sure you are not feeling return air movement??
 
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Old 12-26-09, 06:01 PM
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mbk3

Return air? Doesn't the return air return a different "magic" way? Shouldn't all registers blow hot air at the same time in a single zone system? I think this has been a problem for some time?
 
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Old 12-26-09, 06:06 PM
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ecman 51

I think this has been a problem for at least a few years. This is a rental house so I am not there all the time.

No central AC.

Ducts all run in basement. Temp in basement is somewhat warm because furnace is there. One cool blowing register is in center of the house. I think the other is on an outside wall.
 
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Old 12-26-09, 06:52 PM
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Registers

An easy way to tell if the registers in question are supply or return is to hold a piece of tissue in front of the register while the furnace is running. If the tissue blows away from the register, that register is a supply. If the tissue is drawn toward the register, it is a return. You could be feeling a return draft.
 
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Old 12-27-09, 08:56 AM
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Grady, others

Are you saying that some registers are NOT supposed to supply heat ever, but just suck cool air from the room back into the system? If so, why would there be only a return register in a bedroom. I think this may be the case. I'll have to check.
 
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Old 12-27-09, 09:23 AM
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Maybe the heat regsiter got carpeted over. I have seen carpet guys carpet over registers, and they cut it out later, but have forgot. Or the bedroom may have been a Jack and Jill room after-thought - and now you have 2 small bedrooms rather than one bigger one. The Jack bedroom has the heat and the Jill bedroom has the cold air return.

Let us know about the tissue test, so we can move on, if need be. I see your light is on.
 
 

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