Graciec,

You are welcome for the info.

I would suspect that if you heat the pool in the winter the air temperature in the dome would be warm too. I would think that one of these manufacturers make a heater for them, but I haven't looked into that.

I do want to see if I can keep it open all year, but I am afraid of going broke with the price of gas.

I think the dome can extend the season in our area, but unless you have a large disposable income to feed the gas company, you might not be keeping it open all year.