HVAC Replacement Cost Calculator: 2026 Installed Prices

A typical full HVAC replacement runs $5,000-$12,500 in 2026, with the national average around $7,500. Replacing a central AC alone costs $4,500-$8,500 installed; a gas furnace alone $4,000-$6,500; and a complete furnace + AC system $7,000-$15,000. Size, efficiency tier, brand, and your local labor market drive the spread - the calculator above prices your exact combination.

A combined furnace + AC replacement costs $7,000-$15,000 in 2026 for most homes - roughly $9,000-$10,500 for a typical 3-ton, 80% AFUE system at national-average labor. Replacing both at once saves about 10% versus doing them separately (one crew visit, shared line sets and controls), which is why contractors push the combo when either unit is past 12-15 years.

A ducted heat pump system (outdoor unit + air handler with backup heat strips) runs $7,000-$13,000 installed for standard efficiency in 2026, and $12,000-$20,000+ for cold-climate variable-speed systems in high-cost markets. Ductless mini splits run $4,000-$5,500 for a single zone and $9,000-$16,000 for multi-zone systems. Heat pumps replace both heating and cooling, so compare against the furnace + AC combo price, not AC alone.

Installed central systems average $2,000-$3,000 per ton of capacity - so a 3-ton AC-only swap lands near $6,000 and a 4-ton furnace + AC combo near $11,000. Per square foot, most homes work out to $3.50-$7.50 for a full system. Use tonnage, not square footage, for real budgeting - and verify the tonnage itself with a load calculation, since about half of quoted systems are oversized.

Four reasons: brand tier (premium lines cost 10-20% more than mid-tier for similar hardware), overhead (big fleet companies charge more than two-truck operators), scope differences (one quote includes duct sealing or a new pad and the other doesn't - always compare line items), and commission-driven upselling on efficiency tiers. Get three quotes, make sure each states the exact model numbers and scope, and check the proposed size against our free load calculator.

Use the 5,000 rule: multiply the repair quote by the system's age - over $5,000, replace; under, repair. A $600 repair on an 8-year-old unit (4,800) is worth doing; the same repair at 12 years old (7,200) is throwing money at a dying system. Also lean toward replacement if the unit uses phased-out R-410A refrigerant and needs a coil or compressor, or if it's over 15 years old with rising bills.

Capacitor or contactor: $150-$400. Refrigerant leak repair and recharge: $500-$1,500 (rising as R-410A is phased down). Blower motor: $450-$1,500. Evaporator coil: $1,500-$3,000. Compressor: $1,800-$3,500. Furnace heat exchanger: $2,000-$3,500 - at which point replacement almost always wins. Diagnostic visits typically run $75-$150, often waived if you proceed with the repair.

Reusing existing ducts as-is adds nothing. But duct sealing and minor modifications add $1,500-$3,000, and a full duct replacement adds $5,000-$8,000+ - the single biggest surprise line item in HVAC quotes. If your ducts are 25+ years old, leaky, or undersized for the new system's airflow, budget for duct work and verify sizes with our duct calculator before accepting a quote.

The federal 25C tax credit (up to $2,000 for heat pumps, $600 for ACs) ended December 31, 2025, after Congress terminated it in 2025 - equipment installed in 2026 no longer qualifies federally. What's still available: state-run IRA rebate programs (HEAR/Home Efficiency Rebates, income-qualified, up to $8,000 for heat pumps in participating states), utility company rebates ($200-$1,500, very common), and manufacturer seasonal promotions. Check your state energy office and utility before buying - especially for heat pumps.

Light commercial rooftop units (RTUs) run $3,000-$5,000 per ton installed, so a 10-ton unit lands around $35,000-$50,000 with crane and curb work. Full commercial building systems range $15-$30 per square foot depending on complexity. This calculator is residential; commercial jobs need engineered proposals (ACCA Manual N / ASHRAE load calculations) rather than rules of thumb.

Spring (March-May) and fall (September-November) - the shoulder seasons when installers are hungry for work. Discounts of 10-15% and faster scheduling are common. The worst time is the first heat wave of summer or cold snap of winter, when demand spikes, crews are booked out weeks, and negotiating leverage disappears. If your system is 15+ years old, replace proactively in the off-season rather than waiting for a July failure.

Yes - contractor financing (often through GreenSky, Synchrony, or credit unions) is standard. At 2026 rates, a typical $9,500 furnace + AC system runs roughly $125/month on a 10-year loan at 9.9% APR. Watch for 'same as cash' 12-18 month promotions (fine if you pay them off in time; brutal deferred interest if not) and note that the lowest advertised payments usually hide 15-20 year terms.

A straight AC or furnace swap takes one day (4-8 hours). A full furnace + AC or heat pump conversion takes 1-2 days. Add ductwork modifications and it stretches to 2-4 days. If a contractor quotes a multi-week timeline, that's scheduling backlog, not job length - common in peak season.