The heat output is 4,000 to 9,000 BTU, and—using a 1-pound propane cylinder—this heater provides 3 to 6 hours of warmth to an area of 225 square feet. For comparison, a 14-foot by 16-foot room ...

We put indoor air quality through our scientific testing to find which models work—and which models don’t. View our ratings and reviews to find the best indoor air quality monitors.