I'm now at 71ºF using solar and a relatively thin opaque electric safety cover, but was up to 74ºF before it rained the last couple of days. Average day/night temps have been 51ºF so the solar this time of year wouldn't be expected to get much above 76ºF anyway, but we're due for warmer weather with day/night average moving toward 60ºF at which point the solar could get well into the 80's. Starting tonight, I'll use gas to heat it up so my wife can start swimming. [EDIT] Got it to 88ºF after running gas around 18 hours and and my wife is in the pool now for therapy exercise. [END-EDIT]