Free tool
Furnace Size Calculator
Estimate the right furnace size (BTU) for your home based on square footage, climate and efficiency.
Higher AFUE means a smaller input size for the same heat.
Recommended size
100,000
BTU furnace
94,000
Heat output needed
For a 2,000 sq ft home in this climate, a 100,000 BTU furnace at 96% AFUE is a strong starting point. Oversizing causes short-cycling and uneven heat — proper sizing matters more than going bigger.
Get a properly-sized quote