05/28/2026
It’s that time of year again! Poorly insulated ductwork in a humid crawlspace can allow warm, moist air to condense on the cold metal duct surfaces, especially during cooling operation. This condition can lead to several concerns, including:
* Moisture damage to insulation, framing, and subfloor materials
* Elevated humidity levels within the crawlspace
* Mold and microbial growth on duct insulation and surrounding materials
* Reduced HVAC efficiency and energy loss
* Deterioration or sagging of duct insulation
* Rust/corrosion on metal duct components
* Potential air quality concerns due to mold spores and moisture-related contaminants
* Water dripping onto the crawlspace floor, potentially contributing to standing moisture conditions