Heating and cooling is one of the most expensive systems in your home, so it helps to know the numbers before you call anyone. A full HVAC system replacement typically costs $5,000 to $12,000 installed, while most common repairs land between $150 and $650. A new central air conditioner alone usually runs $3,500–$7,500, and a furnace $3,000–$6,500, depending on size and efficiency.
This guide covers what you’ll pay to install, replace, or repair an HVAC system, what drives those numbers, and where you can trim the cost without cutting corners. Figures are typical national ranges and vary with system size, efficiency rating, and your climate. For pricing on your home, browse the ServiceGoat Cost Guides or get matched with local pros below.
HVAC cost by system type
| System / job | Typical installed cost |
|---|---|
| Central AC unit | $3,500–$7,500 |
| Gas furnace | $3,000–$6,500 |
| Heat pump (air-source) | $4,500–$10,000 |
| Full system (AC + furnace) | $6,000–$12,000 |
| Ductless mini-split (1–3 zones) | $3,000–$9,000 |
| Ductwork install / replacement | $2,000–$6,000 |
Common HVAC repair prices
| Repair | Typical cost |
|---|---|
| Service / diagnostic call | $75–$200 |
| Refrigerant recharge | $150–$650 |
| Capacitor or contactor replacement | $150–$450 |
| Blower motor replacement | $400–$1,500 |
| Thermostat replacement | $150–$500 |
| Compressor replacement | $1,200–$2,800 |
What drives the cost
- System size (tonnage / BTUs): A unit sized for your square footage matters — too small wears out fast, too big wastes money.
- Efficiency rating (SEER2 / AFUE): Higher-efficiency units cost more upfront but lower monthly bills.
- Ductwork condition: Repairing or adding ducts can add thousands to a “simple” swap.
- System type: Heat pumps and multi-zone mini-splits cost more than a basic AC or furnace.
- Labor and access: Tight attics, crawlspaces, or rooftop units raise install time.
- Permits and region: Required in most areas; labor rates vary by metro and climate demand.
Cost breakdown
On a full system replacement, the equipment is usually 50–60% of the cost and labor the rest, plus permits and any duct or electrical work. Efficiency is the lever that changes the long-term math: a higher-SEER2 system costs more to install but can pay back through lower energy use, especially in hot or cold climates where the system runs hard.
Example projects
Replacing a 3-ton central AC
For an average 2,000 sq ft home, a mid-efficiency 3-ton AC swap typically runs $4,500–$7,000 including labor and a new line set. High-efficiency models push toward the top of that range.
Adding a ductless mini-split to a finished garage
A single-zone mini-split to heat and cool one room usually costs $3,000–$5,000 installed — a popular choice for additions and spaces without ductwork.
How to save on HVAC costs
- Replace AC and furnace together if both are near end of life — combined installs cost less than two separate visits.
- Look for rebates and tax credits on high-efficiency and heat-pump systems.
- Service it twice a year — a $100–$200 tune-up prevents far costlier breakdowns.
- Get three quotes and confirm correct sizing with a load calculation, not a guess.
- Don’t oversize. A bigger unit isn’t better; right-sizing saves on both install and energy.
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More cost guides: ServiceGoat Cost Guides · Plumber Cost · Electrician Cost