I am new here and need some good advice. I have a 40x48x14 in a Michigan climate. I bought a Reznor in-fared heater. It has 75,000 Btu and I have 40 feet of pipe. I had it run for 3 hours and it might of climb 5 degrees or so. I also had the chill of with a salamader heater. The last 2...