As an owner is it better to a) install mini splits or  b) make renter supply their own air conditioner.

I'm optimistic that Air Force base upgrades (North) and the Trinity hospital development (South) will create a positive growth trend over the course of the next 5+ years. 

He did a full renovation and in the process switched from a wall heater/central forced air to mini splits.

OK.. still pretty hi.. and keep in mind many of these is done with pipe burst no digging or new hot tap,, My brother in law does them in the SF Bay area as they are required on certain age homes if your transferring title.

People hear heated and expect a hot tub.

The last 2 years of hot inflation is still burned into all our minds.

Shelter is a “human need” according to NASA, along with water air and food.   

Also what type of repairs-new hot water tank, replacing all the electrical and plumbing?

Yes they took down old 14x14 deck and pergola, and hauled away the hot tub (for an extra $1800).

Legislation around short-term rentals also seems to be a hot topic on Dauphin Island, so there is some risk to the STR market there in general.