I would be surprised if the ice is off in May here (NW Minnesota) this year - long cold winter. We only have a 4x20 and a 2x20 for our 18x33, so I'm hoping that will bring our temps into a comfy range. Last year we had an 18' x 48" round pool with just the 2x20 and it kept it at about 82 average (except end of July when we had to run it at night to cool it off!) I guess we could always order another panel if needed. Its FREE heat, can't sneeze at that.

If its normal temps (whats normal?) this year, is it only wishful thinking that the 2x20 with the 4x20 panels will be enough to keep our new pool warm?