Your best bet is to contact your management company or owner and inquire as to what temperature they set the pool at. We have stayed at villas where the pool temperature was anywhere between 78 to 90! You can also inquire as to whether there is another guest staying immediately before you arrive and if they are paying to heat the pool. If so, your pool should be heated when you arrive. As you are paying extra for pool heat most people would assume that the pool will be warm when they arrive, but not necessarily so! This year the people staying next door to us chose not to heat the pool for 2 months and when the next renters arrived, the pool was unswimable despite the new renters paying for pool heat. If the temperature is cool at night, it can also take up to 5-7 days to come up to temperature! This said, I would not hesitate to pay the extra for pool heat or find a management company that factors the extra cost into your daily rental costs.