We recently installed a solarium 105,000 BTU heat pump that I purchased through poolheatpumps.com. The temps have not been great here in KS this week only in the low to mid 60's with on and off rain, not much wind. I have run my heat pump 24/7 since Friday morning and the water temp as of today (Sunday) is 74 degrees, which was about what it was yesterday as well. From what I have seen i should be able to get my pool up to the 80's even if my air temp is in the high 50's, but it does not seem to be getting even close. I do not have a cover on it yet - thought it would come Friday when the reel arrived. I would still think that I should be able to get that temp up higher in the daytime. Are we doing something wrong? Does anyone have a heat pump that could tell me how long it takes to heat the pool? BTW we have an 18 x 36 lagoon shape, sports pool (two sides are shallow, the middle about 6' deep) approx 180000 gallons of water.