Yep, we know the furnace is "borderline" for our house. As is common for lake home in the northwest area of Detroit, most lake homes are or were cottages since in the 30's and 40's this was "up-north" (now it's the upper peninsula of Michigan). I added to my home in 1992, from around 900 square feet to about 1600 (almost double). Because it was small, my furnace, hot water heater, washer & dryer and water softner are all in an 8' x 7' room (washer & dryer are stacking!). Not a lot of room to put a larger furnace in. Most years not a problem, but between the temps and winds (across the lake we're on), it struggles this year (can't wait for the twenties this weekend!). Don't want to see the gas bill! My oldest son with his truck on the lake - notice the drifts at the house!