Well it's January and here in ohio last night was my first real test running my pellet stove with a thermostat. I have a mostly finished basement (no flooring yet) and an upstairs the same size. Both measure to be 1480 sqft. So there is roughly 2900 sqft I'm heating. I turned my electric furnace tstat to 67 degrees and in the basement I turned the pellet stove tstat to 68. Last night it got to 4 degrees. I woke up this morning and I used about 3/4 of a bag of pellets in 10 hours and the upstairs was 69 and the basement was 68 and was not calling for heat. Needless to say for an old pellet stove I'm extremely happy with the performence. Just in case someone was thinking about a tstat I am very happy with it. I got it tuned in just about perfect. Running on d mode aND holding temp wonderfully.