I have a 50 year old house located in Northern NY. It has original windows and doors, I would assume its not the tightest house. To help mix the air better (old ductwork, floor supply and returns) I have increased the blower on my 2 ton AC with Comfort R from (640cfm and 800cfm) to (800cfm and 1000cfm). It makes the air feel less stagnant. I know by doing this my humidity could suffer. I do keep the fan set to Auto. On a 80F (I think design temp was 95F) day outside, with my thermostat set to 72F, I can hold humidity in the low 40s. This is with the AC cycling on and off. a few times an hour I think. When the AC is not running (at night) the humidity goes up near high 50s, which I would assume is normal.
I was wondering what kind of relative humidity readings others get when the AC is running with similar conditions (moderate load etc.) ? Thanks