What not go with a electric heater, then all that's involved by a contractor would be running a 220v line. That's
done everyday and shouldn't cost near as much as the gas equivalent with all that's required. You could hang
the heater from the ceiling. According to the ratings by the manufactures, you need about 25K BTUs/Hr to heat
750 sq/ft. They call it a garage heater, but is that insulated ? I know my 45K heater is way more than I need, but
I'm insulated in all but one wall.
It's a shame to have such a super nice floor that you can't enjoy 6 months of the year. I have my computer, dual
monitors and everything I need in the garage, I'm in there almost every day, all day.
https://www.northerntool.com/shop/t...age-heaters+4294837179+4294837165_0_0_P-Price
.