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How big of a heat pump do I need?

2) How big of a heat pump do I need?

To determine the size of heat pump required, a professional should perform a heat loss/heat gain assessment of the building to determine how much energy is required to heat/cool the building. This can vary greatly due to differences in insulation, air-tightness, basement size, solar access, wind exposure, etc. Typically a heat pump is sized to heat the whole building’s heating demand which may be 70% to 90% of the calculated heat loss if done correctly. The additional 10% to 30% of heat is attributed to other heat sources such as people, appliances, lights, etc. Multiple, smaller systems are more efficient than one large, central system and are recommended if more than 6 tons of heat pump capacity or required. The chart below can be used to approximate the size of the heat pump for an average home, but should be only used as an approximation. 

heat pump capacity

house size (above ground if built to code in the past 20 years)

ton

sq. feet

sq. meters

2

1000

93

3

1500

140

4

2000

186

5

2500

232

6

3000

280

Committee Vocabulary: 

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