How much does it cost to install central air in a house without ductwork?
Adding central air to a house with no existing ductwork runs $7,500 for a small single-zone retrofit, $12,000 for a typical whole-house ducted install, and $22,000+ for multi-zone ducted systems in older homes requiring significant carpentry.
Quick price points (2026)
| Scope | Cost | What it includes |
|---|---|---|
| Low | $7,500 | complete install |
| Typical | $12,000 | complete install |
| High | $22,000 | complete install |
How to budget for this project
- Get 3 quotes
Get itemized quotes from at least three licensed contractors in your area.
- Adjust for your region
Compare the same scope and account for regional labor and permitting.
- Add 10–15% contingency
Hidden conditions, code upgrades and permit fees can increase the original quote.
- Plan the cash, not the financing
Build the replacement cost into the home's repair plan before the work becomes an emergency.