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Furnace Size Calculator

Estimate the furnace size you need in BTU per hour from home square footage and climate zone. A 2000 sq ft home in a cold climate needs about 90000 to 100000 BTU.

Recommended furnace output

95,000 BTU/hr

Zone range

90,000 to 100,000 BTU/hr

BTU per sq ft used

47.5 BTU/sq ft

Climate zone

Zone 4 Cold

Sizing note

Estimates use a square footage rule of thumb. A Manual J load calculation by an HVAC professional is the accurate method.

This is a rule-of-thumb estimate for planning only. A Manual J load calculation performed by a qualified HVAC professional is the accurate method for sizing a furnace and should be used before purchase.

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