you guys down south are lucky...I'm in New England. I opened my pool on Memorial Day weekend and did the spring opening routine and topped off the water level. the water temp was 54 degrees then and now about 64 on a hot day. Seems to lose about 5 degrees overnight depending on the nighttime temps. If we have a heat wave (about 5 days of 90+ weather) the water temp might get up to 75 or so if I use the solar cover. I'm thinking of a solar heater but then I'd need to use the cover very night, then I'd need the reel...nothing but money...thanks for your replies