We too are looking to make this move too. We have been to disney in June an August. What we plan to do is do everything possible we can very late evening even midnight or later after it cools off. Does not work for dr appointments, picking up presciptions, face to face banking (who does that on a regular bases)
Meaning if we don't want to go out in the heat of the day we don't have to for the most part.
Walk neighborhoods you interested in living in stop an talk to the ppl who live there. Ask them lots of questions about the neighborhood. How long most residents have lived there an ages. How BARKING dogs are handled along with dogs running loose both very huge issues in some areas. Walk neighborhood at different times of the day am, afternoon an evening. If possible several different days too.
Go grocery shopping price everything you normally buy add it up, take along copies of your utility bills call the local utility companies as how much bill would be for your average usage now. Remember summer electric might be higher than you paying now but winter should be cheaper. If you tend to water lawn an flowers now your water bill will prolly go up as you will prolly water more often in florida.
When house hunting the 1st thing DH looked at along with price of home was the property taxes didn't matter if the house was reasonible price if taxes was high. Tax rate can vary greatly in the same county too.