Spa Covers

I guess it is not very practical to have a pool or spa here in our town because we always have a cold temperature here even during summer time. So that tells me why most houses here don't have it. I am assuming that houses like in California or maybe in Florida has it mostly for they have the most hottest weather in the country. And having a spa in the house is just so cool, but make sure to put spa covers on it to keep the water clean and usable for the next swimming. That is going to be perfect for a family bonding and maybe a picnic is a good idea too.