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Brubst 07-14-2013 06:47 PM

Air return or not?
 
We have an old clapboard house. Our only cold air return was covered over in a renovation project. I posted a question a few days ago about air re-circulating from our basement and received two great responses. We have HVAC coming out this week, but would like to know beforehand if it is even necessary for a home to have a return vent. Does it affect the furnace in any way if we don't have one. Our budget is a little tight right now, so if we can cap off the hole in the furnace where the old air return was, and save putting in a new one for a future date, it would be great. Any input would be appreciated. thanks!

Patrick Eubanks 07-14-2013 07:07 PM

return
 
Yes, it is necessary

HVAC1000 07-14-2013 07:12 PM

Quote:

Originally Posted by Brubst
We have an old clapboard house. Our only cold air return was covered over in a renovation project. I posted a question a few days ago about air re-circulating from our basement and received two great responses. We have HVAC coming out this week, but would like to know beforehand if it is even necessary for a home to have a return vent. Does it affect the furnace in any way if we don't have one. Our budget is a little tight right now, so if we can cap off the hole in the furnace where the old air return was, and save putting in a new one for a future date, it would be great. Any input would be appreciated. thanks!

Your unit will not be able to push out any air if you can't pull any in

TarheelTerp 07-14-2013 07:17 PM

Quote:

Originally Posted by Brubst (Post 1215917)
...but would like to know beforehand if it is even necessary for a home to have a return vent.

Yes. Ideally... there should be a return vent in EACH room.
Central returns will work... but not as well.

FClef 07-14-2013 07:23 PM

Quote:

Originally Posted by Brubst (Post 1215917)
We have an old clapboard house. Our only cold air return was covered over in a renovation project. I posted a question a few days ago about air re-circulating from our basement and received two great responses. We have HVAC coming out this week, but would like to know beforehand if it is even necessary for a home to have a return vent. Does it affect the furnace in any way if we don't have one. Our budget is a little tight right now, so if we can cap off the hole in the furnace where the old air return was, and save putting in a new one for a future date, it would be great. Any input would be appreciated. thanks!

Think of the furnace in your home as a wind tunnel. What is going to happen if you close off the air supply? You will get substantially less airflow through the tunnel, yes? The basic principle of a warm air/AC duct system is to have an even flow of air over the heat exchanger/evaporator coil. This is controlled by your duct system sizing, dampers on the vents etc. If you reduce the flow of air through the unit, your heat/AC will run forever trying to do the same job it used to do easily. It is the same thing as having a dust plugged filter, it reduces efficiency and airflow.

This is a case of pay me now or pay me later. If you get the work done now it may hurt a little, but you will be operating that system correctly. If you wait, the unit will work harder to do the same job which will cost more in the long run, and also could cause premature failure of your furnace. Pay me now or pay me later. Your choice, but if you can swing it and do it right you won't regret it.

ben's plumbing 07-14-2013 07:32 PM

yes you have to have a return air......ben sr

SPS-1 07-14-2013 07:42 PM

Think of it this way: If a hundred cubic feet of (hot) air is going to exit your furnace, then a hundred cubic feet of (cooler) air has to enter your furnace.

Its not rocket science.


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