How does the furnace replacement cost calculator work?

It scales a national equipment price by your home size and adjusts for your city using a location factor derived from federal regional price data (BEA RPP). The result is an estimate, not a quote.

What size system do I need?

As a rough rule, homes need about 1 ton of cooling per 500–600 sq ft, but climate, insulation, and windows matter. A contractor's Manual J load calculation gives the exact size — don't just match the old unit.

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Furnace Replacement Cost Calculator

By the HomeCostLens editorial team · Reviewed January 2026

Estimate your furnace replacement cost by home size, system, and city. The calculator applies a local price factor so the estimate reflects your metro's labor and material costs. National average for reference: ~$5,500.

Home size (square feet)SystemCity

Estimated furnace replacement cost in Phoenix, AZ

~$7,900

Typical range: $6,700 – $9,500

Estimate only. Scales a national equipment price by home size and a local cost factor (BEA RPP). A contractor's load calculation (Manual J) gives the exact system size. Get free local quotes for a firm price.

Prefer a city-by-city breakdown? See furnace replacement cost by city →

Frequently asked questions

How does the furnace replacement cost calculator work?: It scales a national equipment price by your home size and adjusts for your city using a location factor derived from federal regional price data (BEA RPP). The result is an estimate, not a quote.
What size system do I need?: As a rough rule, homes need about 1 ton of cooling per 500–600 sq ft, but climate, insulation, and windows matter. A contractor's Manual J load calculation gives the exact size — don't just match the old unit.