Home / HVAC / Central AC Installation Cost
How much does central AC installation cost?
The short answer
Installing central air conditioning in a home with existing ductwork typically costs $3,800 to $7,500 for a standard-efficiency system. High-efficiency and variable-speed systems run $7,500 to $12,000 or more. Adding full ductwork to a home without it adds $6,000 to $12,000, which is why ductless mini-splits often win in ductless homes.
AC installation quotes bundle the outdoor unit, indoor coil or air handler, refrigerant lines, pad, electrical work, and permits. Comparing bids means comparing those components and the efficiency ratings, not just the bottom lines, which can differ by tonnage and SEER2 rating while looking identical.
These are directional US ranges for replacement and first-time installs with ducts in place. Full system pricing, including a furnace, lives in our HVAC replacement cost guide.
Cost by efficiency tier
| Tier | Installed range | Notes |
|---|---|---|
| Standard, minimum efficiency | $3,800 to $7,500 | Single-stage, lowest upfront |
| Mid, higher SEER2 | $6,000 to $9,500 | Two-stage common, quieter, better humidity control |
| Premium, variable speed | $8,500 to $12,000 and up | Best comfort and efficiency, most electronics |
Correct sizing beats tier. An oversized premium unit short-cycles and leaves humidity behind, while a right-sized standard unit cools and dries properly. Insist the bid states the tonnage and how it was calculated.
The ductwork question
No ducts changes everything. Full duct installation in a finished home is invasive and expensive. Ductless mini-splits, at roughly $3,000 to $8,000 per zone installed, or a high-velocity small-duct system, usually pencil out better and add zoned comfort as a bonus.
- Existing ducts in good shape: central AC, straightforward
- Existing ducts leaky or undersized: budget sealing and modification
- No ducts, one or two problem rooms: mini-split
- No ducts, whole historic home: get both mini-split and high-velocity quotes
Comparing bids like a pro
Require each bid to list equipment model numbers, SEER2 and capacity, scope of electrical and line work, permit responsibility, warranty terms for parts and labor, and what happens to the old unit. Three bids on that template will cluster honestly, and the outlier will explain itself.
Questions homeowners ask
How long does installation take?
One to two days for a replacement on existing ducts. First-time installs with ductwork run three to five days or more.
What size AC do I need?
Roughly one ton per 500 to 600 sq ft in average climates, adjusted by insulation, windows, and climate. A load calculation, not the rule of thumb, should set the final size.
Is higher SEER2 worth it?
In hot climates with long cooling seasons, often yes. In mild climates, the premium may never repay on energy alone, though comfort gains are real either way.