AC installation cost depends on sizing, whether your home has usable ductwork, your electrical panel and the efficiency tier. In the Puget Sound area many homeowners install a heat pump instead of AC because it cools the same way, heats efficiently and is more likely to qualify for incentives.
Why Seattle homes are adding cooling
Seattle used to be one of the least air-conditioned metro areas in the country. Recent summers — including multi-day heat events — changed that. Homes built to hold heat in during winter can trap it for days in summer, and upstairs bedrooms often run much hotter than the thermostat downstairs.
Adding cooling isn't just about the equipment. Upstairs rooms in older homes often lack return air, and ducts in hot attics lose capacity. A good install addresses airflow, not just tonnage.
What drives the price
Main factors in an AC or cooling quote:
- Size and cooling load — west-facing glass, attic insulation and upstairs rooms matter more than square footage alone.
- Ducted vs ductless — homes with forced air can add a ducted system; homes without ducts usually go ductless.
- Ductwork condition — undersized returns or leaky attic ducts may need work for cooling airflow.
- Electrical panel — a new outdoor unit needs a dedicated circuit.
- Efficiency and staging — two-stage and inverter systems run quieter and keep humidity more even.
- Line-set and pad placement — setbacks, noise considerations and HOA rules can affect location.
- Permits — mechanical and electrical permits are typically required.
Typical price range
| Tier | What's typically included | Range |
|---|---|---|
| Good | Single-stage central AC on existing ducts | $5,800 – $7,800 |
| Better | Two-stage or inverter AC | $6,500 – $8,700 |
| Best | Variable-speed heat pump instead of AC (heats too) | $10,500 – $13,500 |
Typical Seattle and Bellevue-area installed prices (2026), before rebates. Your price depends on your home — we confirm it with a free in-home estimate.
AC vs heat pump in the Puget Sound area
A heat pump is an air conditioner that can also run in reverse to heat your home. The outdoor unit looks almost identical. For most Seattle-area homes, the price difference between a quality AC and a heat pump is modest, and the heat pump can take over most of your heating — lowering gas or electric-resistance heating bills.
Utility incentives in the region generally target heat pumps rather than standalone AC. That's why we usually quote both, so you can compare the net price.
How rebates change the net cost
Utility incentives can change the math more than any other line item. Seattle City Light and Puget Sound Energy both run heat pump incentive programs, and some Eastside cities add local programs on top. Eligibility depends on your utility, what you're replacing (gas, oil, electric resistance or an older heat pump) and the efficiency rating of the new equipment. We confirm what applies to your home during the estimate, show the price after incentives, and file the paperwork for you.
How financing changes the monthly cost
Financing doesn't change the total cost, but it changes what you pay each month. Many homeowners compare the monthly payment on a high-efficiency system against the energy savings it delivers. Our payment estimator on the financing page gives you a rough monthly number, and actual terms depend on credit approval and the lender.
Permits in Seattle and the Eastside
Most HVAC replacements in the Puget Sound area need a mechanical permit, and many need an electrical permit too. Seattle permits run through the Seattle Department of Construction and Inspections (SDCI); Bellevue, Kirkland, Redmond and the other Eastside cities run their own permit desks, and some smaller jurisdictions use Washington's Department of Labor & Industries for electrical. Permit fees and inspection scheduling vary by city, so a quote that skips them isn't really comparable to one that includes them.
What to ask before you sign an AC quote
Did the contractor do a cooling load calculation, or size the system to match the old one or the square footage? Is the quote for a single-stage, two-stage or variable-speed unit? Does it include sealing ducts in the attic or crawlspace, adding returns to upstairs rooms if needed, a dedicated electrical circuit, a pad or wall bracket, permits and a new thermostat?
Ask about noise and placement. Seattle and Eastside lots are often tight, and an outdoor unit under a bedroom window or next to a neighbor's patio can become a daily annoyance. Variable-speed units are noticeably quieter at low speed.
And ask for the heat pump price next to the AC price. In our region the difference is often modest, and the heat pump may qualify for incentives and lower your heating bills — which can make it the cheaper system over time.
Get a real number for your home
Free in-home install estimate with a load calculation and the price after rebates.
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