So, it's finally warming up in Ohio. Heat pump doing ok, got pool up to 75 today and hopefully up closer to 80 tomorrow. Main question is whether it is better to take off solar cover during sunny warmer portion of day while heating or leave on until we swim mid to late day? Either way heat pump will be running aroun 11am-6 pm. I have a 12 mil standard light blue solar cover which keeps heat in well at night. I know most heat loss is from evaporation, but does cover decrease heating efficiency during day or improve it?