The two most important qualities of a furnace when determining its size are its heat output and efficiency. BTUs (Heat Output) To heat a home, 30 to 60 BTUs are required per square foot.

natural gas and oil. Like with air conditioning systems, a furnace’s size is measured in British thermal units, or BTUs. The number of BTUs appropriate for your space is roughly determined by ...

The BTUs affect the cost of replacing the furnace. While electric furnaces are cheaper, they may drive up electricity costs, especially during freezing winters. They are better in areas that ...

A homeowner in Pickering, Ontario works with an experienced HVAC pro to improve comfort, efficiency, and energy savings with a high-efficiency hydronic forced-air furnace upgrade.