How Much Does It Cost to Install Central Air? (Price Guide)

Central air is a split system: an outdoor condenser, an indoor evaporator coil, and a duct network that carries cooled air to each room. Whether your house already has ducts is the biggest question in the price. A home with a gas furnace and sound ductwork usually needs only the cooling equipment, while a home heated by baseboards or radiators needs a whole air distribution system built from scratch.

Prices below come from published guides and carry a check date of Oct 11, 2026. This page covers the installation itself. For unit types and window or portable options, see the separate AC unit guide.

System size is measured in tons of cooling capacity, and a larger home generally needs a larger unit. The sources report a wide spread within each size, because brand, efficiency rating, and the condition of the existing home all move the total.

The 5-ton figure shows the widest gap between low and high. A unit that large often means a bigger house, a second air handler, or modified ductwork, and each of those adds cost beyond the equipment itself.

If the ducts are already in place, the installer connects the new coil and condenser to what exists. If they are missing, the job grows into a much larger project that involves cutting into walls, ceilings, or attic and crawl space.

Existing ducts are not always usable. Leaks, undersized runs, or poor insulation can waste cooled air, and a good installer checks them before quoting. Sealing or replacing sections is a common line item in a quote for an older house.

• Ductwork. Adding ducts to a house without them is usually the largest single variable.
• Unit capacity and efficiency. Higher capacity and higher efficiency ratings cost more at purchase.
• Brand and features. Variable-speed and two-stage models cost more than single-stage units.
• Electrical work. The condenser needs a dedicated circuit, and an older panel may need an upgrade to handle the load.
• Placement. The condenser needs level ground and clearance. The indoor coil needs room above the furnace or inside the air handler.
• Home layout. Multiple stories, tight attics, and finished basements add labor.
• Permits. Most local codes require a permit and an inspection for new HVAC work.
• Refrigerant lines. A longer distance between the outdoor and indoor units takes more line set and time.

A first-time install is the more expensive path. The crew has to design the duct layout, run the lines, set the pad, and often add electrical service. A replacement reuses much of that. The old condenser and coil come out, and the new ones go in, usually in a day or so for a straightforward job.

If your existing system uses an older refrigerant, a replacement generally means matching the new indoor and outdoor components together. Ask the installer whether the coil, line set, and thermostat are being replaced or reused, since reusing old parts can limit the warranty.

Central air installation commonly needs a mechanical permit, and the electrical connection may need its own. The permit process also brings an inspection that checks the finished work against code. Fees vary by city and county, and some contractors fold them into the quote while others bill them separately.

The outdoor unit needs a disconnect near the condenser and a breaker sized to the equipment. If your panel is full or old, adding a circuit may mean a panel upgrade. A licensed electrician should handle this part.

Two guides can describe the same job and land on different numbers. One may price only a standard installed system, while another prices the full HVAC job including a furnace or air handler.

The second row in the table above comes from a general HVAC guide, so it is not strictly a central AC-only figure. Read the label before comparing. Local labor rates, equipment availability, and the season of the job also affect real quotes.

Central air cools the whole house evenly and works well when ducts exist. It is a poor fit when adding ducts would be disruptive. Ductless mini-split systems avoid ductwork entirely and cool by zone. Window units cost far less but cool one room each and block a window. Weigh the number of rooms you need to cool, how long you plan to stay, and whether ducts are already there.

Central air is not a practical DIY job. Handling refrigerant requires federal certification, and a mistake in line sizing, charge, or airflow shortens the equipment's life. The electrical connection also carries shock and fire risk. Many manufacturers void the warranty if a licensed contractor does not install the system. Hire a licensed HVAC contractor and ask to see proof of license and insurance.

• Does the price include the condenser, coil, line set, pad, thermostat, and permit?
• Will my existing ducts be inspected, and are repairs or sealing included?
• What is the system's tonnage, and how was it calculated for my home?
• Is any electrical work included, or is that billed separately?
• What are the warranty terms on parts and on labor?
• How long will the job take, and will the house be without cooling during that time?

Get at least three written quotes and compare them line by line. A very low bid can leave out the permit, the duct repair, or the electrical work.