[QUOTE=Poconos;64779]
Quote Originally Posted by Spensar View Post
Otherwise, they don't do much for the pool temperature in a moderate or northern climate.

Spensar,

I don't know what you consider a moderate or northern climate but I can assure anyone that here in the northeast they do make a big difference as those tables in the links will confirm. Nights are usually quite cooler than the water and they do help retain any heat you gain during the day. Heat is heat whether it is obtained naturally from just the sun on the pool or by fossil fuel or heat pump. Am I missing something?

Al
True, heat is heat. If you have a hot day and the water heat's up, the cover will help keep the heat in.

I think it is fair to give people a heads up that a solar cover by itself will not do a lot to increase the temperature of the pool water. It's greatest utility is in keeping the heat in, not generating it. This especially applies if there is a big difference between the water and air temperature like when you are heating the pool. To many people by it thinking it is some kind of solar heat that will do wonders for their pool temperature, and are very dissapointed afterwards with the modest impact. Most people around here don't bother with it after a while, unless they are heating. I'm in Ottawa, Ontario.