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Furnace Replacement Cost Calculator
A furnace replacement runs $3,500–$8,500 for a standard gas unit and more for oil or high-efficiency condensing models. This calculator sizes the installed budget and flags where ductwork or fuel switching adds cost.
typical 60k–100k for 1500–2500 sq ft
Estimated total
$6,250
installed
Low end
$5,313
High end
$7,500
Equipment cost
$3,400
unit only
Ductwork cost
$0
How the math works
Furnace replacement typically runs $3,500–$7,500 installed for a standard gas unit. Higher AFUE (96%+ condensing) models cost more up-front but pay back through energy savings in 4–8 years in most climates.
Add ductwork cost if the existing system is leaking, undersized, or returning air from an unsuitable location. A Manual J load calculation is worth the $200–300 to right-size the new unit.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Furnace Replacement Cost Calculator is built to give a quick, browser-based estimate for furnace replacement cost. A furnace replacement runs $3,500–$8,500 for a standard gas unit and more for oil or high-efficiency condensing models. This calculator sizes the installed budget and flags where ductwork or fuel switching adds cost. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the furnace replacement cost result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this furnace replacement cost estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter target BTU capacity. 60,000–80,000 BTU covers most 1,500–2,500 sq ft homes in moderate climates; cold climates need more.
- Select fuel. Natural gas is cheapest to install and operate; oil requires a tank; electric has no fuel delivery but higher operating cost.
- Set target AFUE (annual fuel utilization efficiency). Standard is 80%; condensing is 95%+.
- Choose ductwork condition. Replacement can add $3,000–$8,000.
- Apply regional cost factor — higher in HCOL metros with union labor.
Frequently Asked Questions
Is a 96% AFUE furnace worth the upgrade?
In colder climates, yes — payback is typically 4–8 years. In moderate climates where heating runs only a few months per year, the savings may not justify the $800–1,500 upgrade cost.
Should I replace just the furnace or the full HVAC?
If the AC is under 10 years old, replace just the furnace. If both are over 12 years and the AC is R-22 refrigerant, replace together for better price and matched efficiency. Use the HVAC calculator for a full system replacement.
Do I need a permit?
Almost always yes — HVAC work involves gas connections (or electrical), and jurisdictions require inspection. Unpermitted work creates insurance and resale problems. Permit cost is usually $100–$400.
Can I go with a heat pump instead?
Heat pumps are increasingly competitive, especially with IRA tax credits. A hybrid heat pump + gas furnace system works well in cold climates. Add $1,500–$3,500 over a straight furnace replacement.
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