Quote Originally Posted by Spensar View Post
Just a solar cover will do very, very, little to increase the temperature of the pool. The best utility of the cover is if you have a heater and the water temperature is heated to be higher than the night time temperature of the air. That results in a large loss of heat due to the evaporation, which is greatly mitigated with the use of a solar cover.

If you get a cover without any other heating, I will virtually guarantee that after a bit you will hardly use the cover.
The solar cover is actually poorly named. It's really a blanket that prevents heat loss (particularly overnight). Early or late in the season here in the Northeast one can lose several degrees in one night.