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A properly sized furnace ensures efficient and effective heating, comfort, and lower energy bills, and maximized furnace lifespan. What is the most common furnace size? The most common residential furnace size is around 60,000 BTUs, but this can vary based on factors like climate, insulation, and home size.
The heating capacity of a furnace is measured in thousands of BTU (British Thermal Units). Furnaces are rated by the amount of fuel energy consumed when running, called Input BTU. Different furnaces of the same Input BTU have different efficiencies, measured in percentages. For example, a furnace with an Input BTU can have an efficiency of 80%.
If your furnace runs continuously, it could indicate that your home is losing heat faster than the furnace can produce it, which may be due to poor insulation or air leaks. Additionally, running a furnace continuously can increase energy consumption and wear out the system faster. Typical Furnace Run Time in Different Conditions
Sep 22, 2016 · This heating load calculation can then be matched with a furnace that provides the correct BTU output. It’s important to get a furnace sized just right. Too few BTUs will result in a cold house. Too large of a furnace will short-cycle, turning off and on as the house cools, and will be under unnecessary strain. Furnace Efficiency
Square Footage of Your Home x Climate Zone Heating Factor = Total BTUs Needed. For instance, if you have a 1,800-square-foot home in Toronto (Zone 4), and you use a heating factor of 50 BTUs per square foot, you’d calculate: 1,800 sq. ft. x 50 BTUs = 90,000 BTUs. This means you’d start by looking for a furnace that offers around 90,000 BTUs.
An 80 AFUE furnace (with 100,000 BTU rating) and an efficient furnace (94 AFUE 100,000 BTU) will both produce 100,000 BTU of heating output. It’s just that an efficient furnace will need less fuel (propane, gas, electricity) to create this output. To properly size a furnace, we need to use BTU heating needed per square foot for each climate zone:
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Jul 7, 2023 · So, use the calculator and input different efficiency ratings based on the furnaces you might be considering. In a warm climate, experiment with 80% and 90% to 92%. You probably don’t need a more efficient furnace. If your climate is cold, an 80% furnace might not even be available. So, consider furnaces of 90% and higher AFUE.
