One of my children is thinking about having a week's break in February/March and has been looking at villas in Orlando. He has asked me a question I can't answer but I'm sure I'll find the answer here.

It seems obvious that if he's going to use the pool it will need heating at that time of year. His question is, when the villa hasn't been occupied in the preceding week, when is the heating actually switched on and and how long from that point will it take for the water temperature to get to a comfortable level? I suppose his real question is whether it's actually worth doing for 1 week if the pool is being heated from cold.