Last year we purchased an above ground 16'x48" pool. After filling it with water (early July) it took several days before we could gingerly get into the cold water to float around and until August until it was comfortable enough to stand in it. The pool was not expensive (under $300). We are going to put it up this weekend. Is there an inexpensive way to bring the water temp up a few degrees We live in Montana where it can be very windy at times. Pool use is good until about the end of August - maybe a week or so into Sept. Thank you.