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HVAC return ducts in crawlspace under the house?
My house is around 1500 sq ft, mostly peer-and-beam. The central HVAC system was installed before I bought the house with metal delivery ducts in the attic, but the air return is basically just open grilles around the floor allowing air to get into the crawl space under the house. The blower uses air from the crawl space at the intake of the HVAC main unit, which is housed in the garage. Obviously this is not an ideal system as there is humidity under the house and the crawl space has vents to the outside, which allows outside air to come into it. Temperatures can get to over 100 here in Texas - but covering up those crawl space vents increases the humidity inside the house. I am also concerned about any mold/dust/other contaminants present under the house getting into the house via the HVAC.
What would be the best way to feed the air intake of the HVAC unit? I assume installing flexible insulated HVAC ducts under the house, connected to the floor vents on one end and to the HVAC intake to the other would be the best solution. What considerations should I take into account (aside from the air volume calculations) and would anyone have any suggestions as far as what materials to use? Should this be a "sealed system" so that no air from the crawl space gets into the intake?
Many thanks,
Cleber
2 Answers
- 1 decade agoFavorite Answer
Yes it should be a sealed system. You don't want air from the crawl space coming into your house.
That is what i would do is run some insulated flex from the return grates to the return on the air handler.
- ?Lv 45 years ago
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