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tom80 11-01-2011 10:36 AM

Central cold Air Return
 
My son purchased a 1400 sqft. ranch home last year (vintage 1960). It has a 5 year old mid-efficiency furnace installed by the previous owners. The system uses a central air return located in wall of the central hallway outside the 3 bed rooms and LR. QUESTION: Is this air return adequate from an efficiency stand point - i.e. would he benefit from adding returns to the other rooms? The house heats up fine, but the air return is very noisy due to the volume of air moving (or trying to move) through it. I cleaned the return out completely when he moved in. It just seems like a cheap return system to me.
Any thoughts would be greatly appreciated.
Thanks,
Tom

Doc Holliday 11-01-2011 11:00 AM

Might be too restrictive which is why you're hearing the noise. Possibly the original system was smaller than the replacement the last home owners put in and in the event they simply upsized the system than the air flow required would also have needed to be upsized, meaning duct work.

Good thing about returns, you can never hurt a system by adding as many as you like and they generally always help when you do.

tom80 11-01-2011 11:11 AM

Quote:

Originally Posted by tom80 (Post 761445)
My son purchased a 1400 sqft. ranch home last year (vintage 1960). It has a 5 year old mid-efficiency furnace installed by the previous owners. The system uses a central air return located in wall of the central hallway outside the 3 bed rooms and LR. QUESTION: Is this air return adequate from an efficiency stand point - i.e. would he benefit from adding returns to the other rooms? The house heats up fine, but the air return is very noisy due to the volume of air moving (or trying to move) through it. I cleaned the return out completely when he moved in. It just seems like a cheap return system to me.
Any thoughts would be greatly appreciated.
Thanks,
Tom

Thanks - adding ducts should be fairly easy as it's only one level and I have access to the entire first floor through the basement. I was think about running flexible ducts from each of the bedrooms back to the main return on the side of the furnace. As all the heating vents are on the outside walls, I am guessing that putting the return on the opposite wall would be best (and in this case easiest as well)? Thanks again

Doc Holliday 11-01-2011 11:15 AM

Yup, you got it. You don't want to suck the supply air directly back into the system as it comes out of the register so the further away the better.


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