I live in good old tropical Queensland and humidity is an issue for all. I do have aircon but it's in the lounge. If I turn it on it will seep through to the bedroom eventually but the best way to combat it is a really good fan. Regardless, quality of sleep is affected.
What we need is to do away with heated humidification and go to chilled air for the CPAP.
My need for air conditioning is significantly reduced since installing a good ceiling fan. It's quiet, and I stay comfortable on all but the warmest nights. I just got back from the Florida Keys for a couple weeks. Temperatures in the upper 80s day and 70s nights. I used AC the first day to acclimate, then just used natural ventilation and a ceiling fan.
Heat and humidity is different at the many locations members live, and each of us has a different tolerance for temperature. There is no single right answer for this question.
FWIW, I sleep just fine at 80 F temp and 25%RH. And I run a system one with heated tube with temperature setting at 1 so my delivered air temp is a bit higher.
I dont think Cpap makes a difference in your room temperature need.
Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.