> I'm presenting temp/humidity numbers that are reasonable for where I live (NYC where the summers still are pretty hot and humid) NYC, while it does get fairl

> I'm presenting temp/humidity numbers that are reasonable for where I live (NYC where the summers still are pretty hot and humid) NYC, while it does get fairly hot in the summer, is actually not very humid compared to South Texas or South Florida. > you're dehumidifying down to 45% RH -- my consumer-level heat pump doesn't even have that option A typical home A/C system (not heat pump, just straight A/C) in South Florida or South Texas will output a dewpoint of around 50 to 55 degrees F. (I used 12 C = 53.6 F in my heat transfer calculations upthread.) That's significantly lower than the typical dewpoint output of a heat pump (different working fluids, hence different temperatures at the indoor heat exchanger).