Heating capacity is the amount of heat a system can deliver in a given time, usually measured in BTU per hour or kilowatts. It determines whether a furnace, boiler, or heat pump can keep a space comfortable in cold weather. Proper sizing ensures efficiency, comfort, and equipment longevity.
/ˈhiːtɪŋ kəˈpæsɪti/
Heating capacity is the amount of heat a system can deliver in a given time, usually measured in BTU per hour or kilowatts. It determines whether a furnace, boiler, or heat pump can keep a space comfortable in cold weather. Proper sizing ensures efficiency, comfort, and equipment longevity.
Why does heating capacity matter?
It ensures your system can meet heating demand efficiently without wasting energy or sacrificing comfort.
Source: The Cooling Company
Load calculations match system capacity to the building.
A contractor runs a heat load calculation to select a furnace with enough capacity to heat a home without oversizing.
Always use a professional load calculation before replacing heating equipment.
“Always use a professional load calculation before replacing heating equipment.”
Modulating systems can adjust output to match demand, improving comfort and efficiency.
How is heating capacity calculated?
It’s based on climate, insulation, window area, and building size using a load calculation.
Can I increase heating capacity without replacing equipment?
Not significantly. Improving insulation and sealing reduces the required capacity instead.
Does heating capacity affect energy bills?
Yes. Incorrect capacity can increase energy use and reduce comfort.
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