I have an 11 year old Rheem gas furnace. I have been running the AC over
the last several days and the air circulates through the furnace. Tonight I
went to change the air filter and found the bottom of the filter was all
damp. There was also some moisture that accumulated in the bottom of the
unit. It is humid here today.
In all my time that I have owned this furnace I do not recall having any
condensation inside the unit. Any thoughts about what is causing this? Is
it okay to run?