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- Jul 2, 2007
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- 5,294
Conditioned crawl space, no foundation vents. One supply duct blows heat or cool into crawl space, open ended w/ no register grill. Approx. 6 - 8 ft from this single duct that supplies conditioned air to crawl space, there is a return opening that draws crawl space air into the system, intermixing it with return air from the living space above.
Yesterday, an HVAC technician recommended blocking off that crawl space return. Said when their company does new construction rough-ins they never put returns in conditioned crawl spaces, only supply registers, and if you *are* going to have a return in there that intermixes crawl space air with living space air then you should consider having a UV light treatment system installed on the return plenum (in a serviceable area, usually on return plenum near where it connects to furnace) as well as a dehumidifier installed in crawl space.
I tend to agree with this guy. I don't think the rough-in contractor back in 2003 when house was built should've put a return opening in the crawl space. I am going to take the advice of yesterday's technician (from company that installed the new Amana system in February) and block off the crawl space return vent. May also install dehumidifier in crawl space as well, could be plumbed into sump pump's drain pipe with relative ease.
Yesterday, an HVAC technician recommended blocking off that crawl space return. Said when their company does new construction rough-ins they never put returns in conditioned crawl spaces, only supply registers, and if you *are* going to have a return in there that intermixes crawl space air with living space air then you should consider having a UV light treatment system installed on the return plenum (in a serviceable area, usually on return plenum near where it connects to furnace) as well as a dehumidifier installed in crawl space.
I tend to agree with this guy. I don't think the rough-in contractor back in 2003 when house was built should've put a return opening in the crawl space. I am going to take the advice of yesterday's technician (from company that installed the new Amana system in February) and block off the crawl space return vent. May also install dehumidifier in crawl space as well, could be plumbed into sump pump's drain pipe with relative ease.