I have a super insulated, envelope home. I have R-88 in the ceiling and R-44 in the walls. Living in Northern WI I do have heating requirements, but nowhere near the output of the 90,000 BTU furnace that was originally installed. After living in the home a few years I decreased the burner orifices to give a 50,600 BTU output. This was better and I have used it for the last 20 years. Now my furnace is 33 years old and I am looking for the "Right" furnace to install.
I have connected my furnace to my computer and have recorded every burn cycle for the last year. I have read my gas meter to calculate the amount of gas used per minute. I then calculated that my furnace requirement is about a 25000 BTU furnace. The smallest furnace I can find on the market is a 40,000 BTU furnace. I calculate the 40,000 BTU furnace about twice as much heat as I need.
I do not want to decrease the output of my current furnace (by reducing the number of gas nozzles), as I am concerned with effecting the efficiency of the furnace.
What are my options for such a small heating requirement?