🔥 Furnace Size Calculator
Calculate the right BTU furnace size for your home based on climate and construction
Home Details
Insulation & Windows
Fuel & Costs
Quick Sizing Guide
| Home Size | Mild | Moderate | Cold |
|---|---|---|---|
| 1,000 sq ft | 30-40k | 40-50k | 50-60k |
| 1,500 sq ft | 40-55k | 55-70k | 70-85k |
| 2,000 sq ft | 55-70k | 70-90k | 90-110k |
| 2,500 sq ft | 70-90k | 90-110k | 110-130k |
| 3,000 sq ft | 90-110k | 110-135k | 135-160k |
BTU ranges in thousands. Actual needs depend on insulation, windows, and other factors.
HVAC Tips
⚠️ Don't Oversize: An oversized furnace short-cycles, wasting energy and wearing out faster.
✅ Right Size: Properly sized furnaces run longer, more efficient cycles.
🔧 Manual J: For accuracy, have an HVAC pro perform a Manual J calculation.
🌡️ Two-Stage: Consider a two-stage furnace for better comfort and efficiency.
⚠️ Professional Sizing Recommended
This calculator provides estimates based on general guidelines. For accurate sizing, a licensed HVAC contractor should perform a Manual J heat load calculation which considers your specific home's construction, orientation, ductwork, and local climate data. Improper sizing can lead to comfort issues, higher energy bills, and equipment problems.
About Furnace Size Calculator - BTU & HVAC Sizing
Calculate the right BTU furnace size for your home. Estimate heating requirements based on climate and construction.
Furnace Size Calculator - BTU & HVAC Sizing is a powerful online utility designed to help you process images quickly and securely. You can combine this with our Image Compressor for a complete workflow.
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