Be sure to consult a dealer when sizing. Previous heating
efficiencies, and heat loss need to be considered when sizing a
furnace. This is only a guideline. The sizing calculation estimates
the existing fossil fuel (heating oil, propane, natural gas) heating
equipment performing at 75% efficiency.
This calculator estimates your cost savings based on the assumption
that you obtain your own firewood at no cost to you. In addition, the
calculation is based on the alternate energy costs and units of energy
that you supply. If the costs or units of energy vary over time the
actual cost savings could be more or less. The results that you obtain
from the calculator are therefore not a guarantee of annual cost
savings that you can expect to realize.