Amy Nieland 3:26 PM (6 minutes ago) to me Good afternoon folks. I just wanted to let you all know, that after the brutal cold we’ve had up here in Minnesota over the past week, this unit hasn’t failed us once. Last night the temperature dropped to -36 degrees Fahrenheit. The day before it was -34 degrees Fahrenheit with a 35 mph wind, making the windchills close to -70°. Yesterday’s high was -20°, yes that was our high temperature. This unit kept our 4,000 sq ft. house at a comfortable 72°. Thank you for such a wonderful product!