What size forced air furnace should a 1600 square foot house have?

For a 1600 square foot house, the size of a forced air furnace typically ranges from 60,000 to 80,000 BTUs, depending on factors such as climate, insulation quality, and the home's layout. A more accurate calculation can be made using a Manual J load calculation, which considers specific details about the house. It’s advisable to consult with a heating professional to determine the optimal size for efficiency and comfort.