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We recently built a home in central Alabama with spray foam insulation. After a long discussion with our HVAC contractor about humidity in tightly built homes, we opted for the variable speed AHU and two-stage compressor for our HVAC (trane units). Fast forward to our first winter, and we've had nearly two months where our HVAC runs very little. I would guess on average it runs for a few minutes once or twice a day, and some days not at all. So there is little to no humidity control. Unfortunately, the humidity outside has been relatively high for most of the winter so far, and the humidity in most of the house stays between 55% and 60% and the master bedroom usually stays between 60% and 65%. Oddly enough, our basement is the driest part of the house as it's only creeped above 55% in the past few days. I run the vent fans, but it's just pulling in humid air from outside.
Should I be considering a central dehumidifier? I'd love to say this type of weather is rare in Alabama, but I'd say this is probably the norm for a good portion of winter and spring.
Should I be considering a central dehumidifier? I'd love to say this type of weather is rare in Alabama, but I'd say this is probably the norm for a good portion of winter and spring.