I'm new to pellet stoves and need some help. I like the looks of the XXV and the MtVernon. I have approx 1900 sq feet upstairs and down to heat. Will install on 1st floor. XXV 50,000BTU, MTVernon 60,000 BTU. Quad dealer says quads are more efficient, Harman dealer says Harman ;-) . All of your help will be very helpful in my decicion making, THANKS