Thanks for the info...I have researched domes. I am disappointed to hear how cold it stays inside. I was assuming it would warm up and stay warm inside;they do sell extra heaters with some dome models.
I guess the gas prices would scare me off too, since it ridiciously high to heat our homes in the winter already.
So you have used more as a winter "cover " and don't really swim in it when it gets cold?

I have looked at ameridome and one other brand.
I still may try it one of these years for 2,000$ it is worth taking a chance, since we will never have an indoor pool.
Thanks for your input.