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Furnace Replacement Cost: Why the 95% AFUE Rule Changes the Math
Furnace replacement cost moved on two fronts this year: the installed range most homeowners now see runs $3,500 to $9,500, and the US Department of Energy’s new 2025 rule quietly deleted the cheapest option in roughly 30 northern states by raising the minimum efficiency floor to 95% AFUE. If your furnace is dead while a cold front is outside, here is what a straight quote should look like and where the money actually goes.
Furnace Replacement Cost at a Glance
- Gas furnace (the US default): about $3,500 to $9,500 installed depending on efficiency tier and market; manufacturers’ current planning ranges run as wide as $3,800 to $12,000 for complex installs.
- Most common turnkey bill: Angi’s 2026 data pegs the typical replacement near $6,000 to $7,500.
- Equipment only, for reference: an 80% AFUE gas unit is roughly $1,400; a 92% single-stage about $1,800; a 96% two-stage $2,000-$2,700; and a 97%+ modulating unit $2,500-$3,000+.
- All the rest is labor, duct repair, venting, permits and disposal – which is why a same-tier quote can vary $1,500 between two contractors in one city.
The 80% vs 95% AFUE Decision
AFUE is the share of every fuel dollar that becomes heat: an 80% furnace sends 20 cents of each dollar out the flue; a 95% unit keeps all but 5 cents. For a mid-size 1,500-2,000 sq ft home, 2026 pricing clusters near $5,000 installed at 80% AFUE, $5,800 at 90-95%, and about $6,500 for premium 96%+ condensing models – a 30% premium for the top tier. The DOE catch matters: the federal minimum for non-weatherized gas furnaces is 80% AFUE, but the 2025 rule raised the local minimum to 95% AFUE across roughly 30 northern states. In those states, the high-efficiency tier is not an upgrade – it is the only product in the catalog, and operating savings usually justify it anyway in a long heating season. In the milder markets where 80% remains legal, the cheaper unit can still be the rational buy if winters are short and fuel prices are low.
What Else Moves Your Quote
- Fuel type: electric furnaces run $2,800-$5,500 installed (cheapest to buy, most expensive to run in cold climates); propane $4,000-$7,500; oil $5,500-$9,000.
- Ductwork: old, leaking or badly sized ducts add $1,000-$3,000 – ducts matter as much as the box.
- Size sanity: any honest contractor starts with a load calculation, not a guess by square footage; an oversized furnace short-cycles and dies younger.
- Replace with the AC at once: doing furnace and AC together usually lands better than staggered replacements because labor and refrigerant work overlap – bundled jobs commonly run $7,500-$12,500 at mid efficiency.
- Permits and code: local permit fees plus venting and gas-line upgrades are the small print that turns a $4,800 quote into $7,200.
Repair or Replace: The Fast Test
Before replacing anything, work the triage: if the furnace still runs but the house is cold, try the diagnosis steps in our furnace-not-heating checklist first – a dozen of those failures cost under $150 to fix. If repair and replacement are genuinely on the table, the 50% rule in our HVAC repair-or-replace framework settles the call: repair cost near half of replacement on an aging system means replace.
Where This Fits in Winter Prep
A furnace and the plumbing share a deadline: the first hard freeze. The plumbing side is covered in our frozen pipe prevention math, and the services-scope baseline in what a plumber costs. Get three itemized bids on a furnace, in writing, with the load calc attached – that is how a $6,800 job stays a $6,800 job.
Bottom line: $3,500-$9,500 installed for gas, the 95% floor now mandatory across the North, high-efficiency as the ROI play in every long-winter market – and the real quote risk is ducts, permits and sizing, not the box itself.