Humidity and negative pressure
A customers home (zone 4 non-marine) has condensation problems (summertime) on a particular HVAC duct. Upon inspection the %RH was at 60%. There is a whole house dehumidifier hooked in with the HVAC System (Fan runs at low speed continuously) Bathroom exhaust fans are backflowing and letting in a significant amount of heat, and when opening the front door one can feel the hot air entering the house. There is no ductwork in the attic, it is all in the basement.
I have thought about disconnecting the Dehumidifier from the HVAC (running it independently) and letting the fan cycle with the A/C rather than constantly on.
I still can’t sort out the negative pressure issue.
Any thoughts on the issue.
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