I bought a house in july and I started fixing up the old old wood burner in the basement. Its a gravity flow deal. The old guy who owned the home hasnt used it for 10 years. I spent a lot of time cleaning it up and making it functional again. New gaskets new ducting cleaned the chimney. I burnt some small stuff in it to test it. And everything functions great. Well we had some cool evenings high 40s and low 50s and ive been racking my brain. As to why it wasnt heating the house more than 2 or 3 degrees. tonight I built a fire in it. 37 outside and its heating like crazy. The burner has physically heated up better. From 60 in the house to 70 in an hour. I cant believe it. 2 changes happened tonight. I put a flue damper in and after it warmed I closed it about 1/2 and the temp outside is much lower my question is does out side temp effect how a wood burner functions?