I have a quick question. I have an add-on burner. Hotblast 1557m, and it heats our 1400 Sq. ft house Awesome. It get's up near 80 degrees + and we have to open a window. My question is, when it is in single digits, the unit has a hard time staying up to 70 degrees, especially when we have a strong cold west wind. Anything I can do to make the house heat up like it does normally?