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Furnace Size Calculator — Free Online Tool
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Furnace Size Calculator

Calculate required furnace heating capacity in BTUs based on home area and climate

HVAC Standard: Heating requirements depend on total conditioned square footage, regional climate zones, and home insulation quality. Standard calculation: $\text{Area} \times \text{BTU per sq ft}$.
Home & Climate Parameters

Calculation Results

⚠️ Furnace sizing estimates are for planning purposes. Proper Manual J load calculations by a certified HVAC professional should be performed prior to equipment purchase.

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