Top 10 Ac Installation in Seattle, WA
The best AC installation companies in Seattle, WA for 2026 include Greenwood Heating and Home Services (4.9), Evergreen Home Heating and Energy (4.8), Glendale Heating & Air Conditioning (4.8). All offer free estimates, licensed installation, and manufacturer warranties on new units.
AC Installation in Seattle, WA: What to Know Before You Buy
A new AC system is a major investment. The right installer in Seattle, WA will properly size the unit for your home, handle permits, and back the work with a solid warranty. Undersized or poorly installed systems waste energy and fail early.
- Get a Manual J load calculation — not just a rule-of-thumb sizing
- Ask about SEER2 ratings and expected monthly energy costs
- Confirm the warranty covers both equipment and labor
Greenwood Heating and Home Services
Green City Heating and Air Conditioning
Evergreen Home Heating and Energy
Go Green Heating AC & Electric
Essential Heating and Air
Seattle Heating & Cooling
Glendale Heating & Air Conditioning
Seattle Heating & Cooling
Brennan Heating, Air Conditioning, & Electric
GREENTOP Heating
How We Ranked These Seattle Pros
Our rankings are based on a weighted evaluation of five key factors:
- Licensing & Insurance — All listed businesses hold active state licenses verified through official databases.
- Customer Reviews — We aggregate ratings from Google, Yelp, and the BBB, weighting recency and review volume.
- Response Time — Companies offering same-day or 24/7 emergency service score higher.
- Pricing Transparency — Businesses who offer flat-rate pricing or free estimates rank above those with opaque billing.
- Experience & Longevity — Years serving the Seattle market and breadth of services factor into overall reliability.
Rankings are reviewed quarterly. Have a correction? Contact us.
Frequently Asked Questions
How much does AC installation cost in Seattle?
AC installation in Seattle costs $3,000-$7,000 for a central air system. A full HVAC system (AC + furnace) runs $5,000-$12,000. Mini splits cost $2,000-$5,000. Price depends on home size, SEER rating, and ductwork needs.
How long does AC installation take?
Standard replacement takes 4-8 hours (1 day). New installation with ductwork takes 2-5 days. Mini split installation takes 1-2 days.
What size AC do I need?
General rule: 1 ton per 500-600 sq ft. A 2,000 sq ft home needs a 3-3.5 ton unit. A professional load calculation (Manual J) gives the precise answer — oversized or undersized units waste energy and fail faster.