I could look into it again because it has been years. Natural gas was more economical than propane and the heaters require an orifice change. To my knowledge a dual fuel option is not common or possibly not sold.
Creativity seems to be discouraged in the liability laden HVAC market.
I did not know coatings would prevent the floor sweating. I will confirm that with my neighbor, he spent $3k on his floor prior to his oldest sons grad party 5-6 years ago.
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