A return leak in a vented crawl space is most likely to cause?
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A 30% return duct leak on a hot or cold day can decrease your heating or cooling capacity more than 50% That may sound extreme, but it’s not an uncommon condition. A poorly performing duct system can cause air comfort problems, high utility bills and could become hazardous. A qualified contractor can measure your entire system’s performance and show you how to get the most out of your central heating and air conditioning.
I would recommend a duct renovation with air balancing. For more information on the benfits of these, go to www.howellsac.com
return leak? as in a return air duct on your Air Conditioner? it will pull in what ever dust or dirt is up there along with the warm unconditioned attic air back to the unit, and depending on where your air filter is located you may be getting your evaporator coil very dirty, seal up any and all air leaks you can find.
If your question was regarding something else, please elaborate.
A big waste of energy . If your crawlspace has lots of mositure it will be entering the living area. If you live in an area with radon gas you will also be sucking that in as well.
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