HVAC Installation Cost 2026: Central Air, Heat Pump & Furnace

HVAC System Types and Costs

HVAC costs vary widely based on the system type, efficiency rating, home size, and whether existing ductwork is available. The table below covers the four most common residential HVAC configurations for a 2,000 to 2,500 square foot home.

Central Air Conditioning

A central air conditioner costs $3,500 to $8,000 installed as a standalone unit paired with an existing furnace. A 3-ton unit (suitable for 1,500 to 2,100 square feet) costs $3,500 to $5,500, while a 5-ton unit (2,500 to 3,500 square feet) costs $5,000 to $8,000. The SEER2 (Seasonal Energy Efficiency Ratio) rating determines operating costs. The 2023 minimum standard is SEER2 14.3, but units rated SEER2 17 to 20 save 25 to 40 percent on cooling costs.

Adding central air to a home without existing ductwork is significantly more expensive. New ductwork costs $3,000 to $10,000 depending on the home's size and layout. Ductless mini-splits are often a more cost-effective solution for homes without ducts. Estimate your cooling energy costs with JouleIO's electricity cost calculator.

Heat Pumps: Heating and Cooling in One

Heat pumps provide both heating and cooling by moving heat rather than generating it, making them 200 to 300 percent more efficient than electric resistance heating. A standard ducted heat pump costs $5,000 to $12,000 installed. Cold-climate models designed for temperatures down to minus 13 to minus 22 degrees Fahrenheit cost $10,000 to $20,000 but eliminate the need for a backup furnace in most regions.

The federal Inflation Reduction Act provides tax credits of up to $2,000 for heat pump installation through 2032, and income-qualified homeowners may receive additional rebates of $4,000 to $8,000 through state HOMES programs. These incentives make heat pumps competitive with gas furnaces even in areas with low natural gas prices. For the overall energy impact, check our energy-efficient upgrades guide.

Furnace Replacement

A gas furnace replacement costs $3,000 to $8,000 installed. Standard efficiency (80 percent AFUE) models cost $3,000 to $5,000, while high-efficiency condensing furnaces (95 to 98 percent AFUE) cost $5,000 to $8,000. High-efficiency furnaces require a condensate drain and PVC venting rather than a traditional metal chimney flue, which can add $500 to $1,500 if not already present.

Electric furnaces cost $1,500 to $4,000 installed but have much higher operating costs than gas. Oil furnaces cost $3,500 to $7,000 installed and are common in the Northeast. When replacing a furnace, it is an ideal time to also inspect and seal ductwork, which can lose 20 to 30 percent of conditioned air through leaks. Proper insulation further reduces your HVAC load. Use our drywall calculator if opening walls to access ducts.

Sizing: Why It Matters

An oversized HVAC system short-cycles (turns on and off frequently), wastes energy, fails to dehumidify properly, and wears out faster. An undersized system runs constantly and cannot maintain comfortable temperatures on extreme days. Proper sizing requires a Manual J load calculation that factors in your home's square footage, insulation levels, window area and orientation, climate zone, and occupancy. Most HVAC contractors perform this calculation for free as part of their bid. Be wary of any contractor who sizes equipment based solely on square footage without performing a load calculation.

When to Replace vs. Repair

• Age: Replace furnaces over 20 years old and AC units over 15 years old. Efficiency has improved dramatically.
• Repair cost: If a repair costs more than 50 percent of a new unit's price, replace it.
• R-22 refrigerant: Systems using R-22 (Freon) should be replaced since R-22 is phased out and costs $100+ per pound.
• Energy bills rising: A steady increase in energy bills despite normal use suggests declining efficiency.
• Uneven temperatures: Rooms that are always too hot or cold indicate a system that can no longer distribute air effectively.

Financing an HVAC replacement through a home improvement loan is common. Amortio's loan calculators help you compare monthly payments for different loan amounts and terms.

Frequently Asked Questions