Crawl Spaces and Your AC in Chattanooga
A damp crawl space can make a well-working AC feel like it isn't doing its job. In a rainy, humid valley, crawl spaces deserve attention.
Request an AC technicianAir moves up
Air from the crawl space moves into the living space through gaps in the floor and leaky ducts.
Ground moisture
Bare soil gives off moisture. A vapor barrier cuts it down.
Duct problems
Disconnected or torn ducts can dump cooled air under the house or pull damp air in.
Condensation
Cold ducts and pipes can sweat in a humid crawl space, wetting insulation.
Drainage
Gutters, downspouts and grading keep rainwater away from the foundation.
Dehumidifiers
A dedicated dehumidifier helps on mild, damp days when the AC doesn't run much.
Pests
Animals can damage ducts and insulation. Seal openings and check after winter.
Get help
See crawl space humidity.
Check after storms
After heavy rain, look for standing water under the house. Water that stays for days means drainage needs work.
Get a full picture
A contractor who looks at the crawl space, ducts and AC together can find the real source of a humidity problem.
Signs inside the house
Cupping hardwood floors, a musty smell when you walk in, sticky surfaces and mold on stored items in lower closets often trace back to the crawl space rather than the AC.
Insulation under the floor
Batts hanging loose or soaked under the floor no longer insulate. Wet insulation should be removed and the moisture source fixed before new insulation goes in.
Who to involve
Crawl space moisture can involve drainage, the AC and the building itself. A contractor who looks at all three gives you a clearer plan than one who looks at only one.
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