We have a 1400 sq. foot ranch with a great room where the stove is located. After insulating properly, I have been kicking myself for buying the P68 because it's too much stove for the house. I don't know what would have happened with the P43, but I actually had to get up in the middle of the night to turn the temperature down, it was too hot. The bedroom off the great room was 71, the bedrooms at the far end of the house were 68 degrees, the great room was 73, the temp outside was -3 degrees. During the day those temps would be fine in the house, I just like it cooler at night. We don't get those temps too much around here, so I haven't had much chance to test the stove. It was nice to know I think it could handle anything that we might get. Hope everyone had a warm night last night!