We finished our pool late last year (September) and did not get a heater. We have an automatic cover and I'm kinda cheep so I didn't buy a heater. The wife wants to add a heater to warm up in the spring and keep the water around 80-85 degrees. I am saying with the cover, we will have warm water in no time and the sun will keep it warm if we keep the cover on. Any opinions? Location is central Indiana.