The average cost to install a central air conditioning unit ranges from $3,500 to $18,000. That said, your final price depends on several factors — including your home's size, the type of system you choose, and whether you need new ductwork installed.
Why the Price Range Is So Wide
A lot of homeowners are surprised when they get their first quote. "I thought it would just be the unit price plus a couple hours of labor" — and that's understandable. But AC installation is a whole-home project, and a few variables can move the number significantly.
Here's what's actually driving your cost:
1. The Type of System You Install
Not all AC systems are created equal, and the type you choose is one of the biggest cost factors:
- Central AC (replacement): $3,800–$7,500 for equipment and standard labor. This is the most common scenario for homeowners who already have ductwork.
- Central AC (new install with ductwork): $9,000–$20,000+. If your home has never had central air, you'll need ducts installed throughout — that's a major addition to the project.
- Ductless mini-split: $2,000–$4,500 per zone. A great option for homes without ductwork or for adding cooling to a specific room or addition.
- Window/portable units: $200–$1,500. Plug-and-play and don't require professional installation, but they only cool one room at a time.
2. The Size of Your Home
AC systems are measured in "tons" of cooling capacity. A larger home requires a larger system, which costs more to purchase and install. As a general rule:
- Up to 1,200 sq ft → 1.5–2 ton unit
- 1,200–1,800 sq ft → 2–2.5 ton unit
- 1,800–2,500 sq ft → 2.5–3.5 ton unit
- 2,500+ sq ft → 3.5–5 ton unit
Oversizing your system is a common mistake — a unit that's too large will short-cycle (turn on and off too frequently), leading to poor humidity control and higher wear on the equipment. A proper Manual J load calculation from a licensed HVAC technician ensures you get the right size.
3. Ductwork Condition and Needs
If you already have ductwork in good condition, you're in the most affordable category. But if your ducts are old, damaged, or nonexistent, expect to add anywhere from $2,000 to $7,500 to the total project cost for duct repair or new installation.
4. Labor Costs
HVAC technicians typically charge $75–$250 per hour, and a full installation usually adds $1,000–$2,500 in labor to the total bill. Rates vary by region, and more complex jobs (tight attic spaces, second-story work, electrical upgrades) naturally take longer.
5. Energy Efficiency (SEER Rating)
The SEER (Seasonal Energy Efficiency Ratio) rating tells you how efficiently a unit cools your home. Higher SEER = lower monthly energy bills, but a higher upfront cost. In California, all new residential AC units must meet a SEER2 minimum of 15, so you'll already be starting with a reasonably efficient system.
If you're planning to stay in your home long-term, investing in a higher-efficiency unit (SEER2 16–18+) often pays for itself over time through energy savings.
What About Rebates and Tax Credits?
Before you finalize your purchase, it's worth checking whether your new system qualifies for financial incentives. The federal Inflation Reduction Act offers tax credits of up to $600 for qualifying high-efficiency AC systems. Additionally, many California utilities — including Southern California Edison — offer rebates for energy-efficient equipment.
Check EnergyStar.gov and your local utility's website for current offers before you buy.
How to Get an Accurate Quote
The best thing you can do before committing to any number is get at least three quotes from licensed HVAC contractors in your area. Prices can vary more than you'd expect, and a reputable contractor will always perform a load calculation before recommending a system size.
At Jet Air Solutions in Glendora, we provide honest, transparent estimates with no surprise fees. If you're curious what a new AC installation would cost for your specific home, give us a call — we're happy to walk you through your options.