Just bought a house here in Florida. I have the MH plugged in 'just' because I am using the antenna from the MH to power the TV inside the house while I remodel. That said.
It's been plugged in, windows closed, with all roof vents open(they have maxxair covers) for one year now.....no ac or fan on inside and all is well! Heat naturally rises so all the hat goes out the vents.
If it were true that a fan or ac HAS to be on in RV's parked in Florida or they would be ruined........then each and every RV on a dealership lot would be not be worth selling. And they don't even open the roof vents.:W