Furnace & AC Replacement Cost Calculator
Estimate furnace and AC replacement costs — and see how much you save by replacing both at the same time.
How It Works
Select what's being replaced
Choose furnace only, AC only, or both — bundling saves 5–8% on labor.
Enter home size and efficiency
Input square footage and preferred SEER/AFUE rating for the new equipment.
Apply IRA tax credits
High-efficiency units may qualify for $600–$2,000 in federal tax credits.
Should You Replace Both at Once?
If your furnace and AC are both over 10 years old, replacing them together typically saves 5–8% on total costs versus two separate jobs. You also get matched efficiency ratings and a single warranty period.
AC Only
$2,500 – $5,500
Furnace Only
$1,800 – $4,000
Both (Bundle)
$4,000 – $9,000
Frequently Asked Questions
Should I replace my furnace and AC at the same time?
If both units are over 10 years old or one is near end of life, replacing both together saves 5–8% on total cost versus two separate jobs. You also get matched efficiency ratings, a single warranty start date, and one service call. If one unit is relatively new (under 7 years), replace them separately to maximize each unit's lifespan.
How much does furnace replacement cost?
Gas furnace replacement costs $1,800–$4,000 for a standard 80% AFUE unit installed. High-efficiency 96%+ AFUE furnaces cost $2,500–$5,500 installed. Electric furnaces cost less upfront ($1,500–$3,000) but have higher operating costs. Oil furnaces are the most expensive to replace at $3,000–$6,500. Always compare AFUE ratings — a 96% furnace vs 80% furnace saves 16% annually on heating bills.
How long do furnaces and AC units last?
Gas furnaces last 15–25 years with proper maintenance. Central AC units last 12–17 years. Heat pumps last 15–20 years. Key factors affecting lifespan: filter changes (monthly or quarterly), annual professional maintenance, proper sizing, and local climate. Units in very hot or cold climates run harder and wear faster.
What is a good AFUE rating for a furnace?
AFUE (Annual Fuel Utilization Efficiency) measures furnace efficiency. 80% AFUE is the federal minimum for most climates. 90–95% is considered high-efficiency and qualifies for tax credits. 96–98% are premium units that save the most on fuel. In cold climates, upgrading from 80% to 96% AFUE saves roughly 20% on heating bills annually — the payback is typically 5–8 years in cold areas.
Get your personalized estimate
Answer 5 quick questions for a cost range tailored to your home.
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