My work shop is 20' X 22' I'm looking for the best method to heat it during the winter. I live in southeast PA, it can get pretty cold in the winter. I'd like a ceiling mounted heater, not alot of free floor space in my small shop. I was thinking about getting a ceiling mounted propane fired forced air heater or infared heater. Has anyone had any experience with either of these heaters? Any pro or cons of either type, any other suggestions?

Thanks,
Shawn