How do I check an HVAC company's registration in Washington?

Ask for their registration number and look it up on L&I's Verify a Contractor or on checkthepro.com/lookup. An active registration means they have the bond and liability insurance the state requires.

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HVAC companies in Seattle, WA

Q: How many HVAC companies are registered in Seattle, WA?

52 HVAC companies with a Seattle business address are registered with Washington's Department of Labor & Industries, as of October 16, 2026. Many more from nearby towns also work in Seattle.

52registered with the state

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Before you hire

1Registration active, same name as the estimate. Check it.

2Permits and rebates: ask who pulls the permit, and if a heat pump qualifies for your utility's rebate.

3Written estimate first. No big cash deposits.

52 registered HVAC companies

L&I register, Oct 16, 2026. A–Z. Listing isn't a recommendation.

ACCO ENGINEERED SYSTEMS INCACCOESI971KW · Electrical Contractor · renews Nov 2028

ACCURATE MECHANICAL LLCACCURML765JS · Construction Contractor · renews May 2028

ACCURATE MECHANICAL LLCACCURML766DF · Electrical Contractor · renews Mar 2028

ACE HVAC SERVICE LLCACEHVHS797OT · Construction Contractor · renews Sep 2027

ADVANCED ENERGY SAVERS INCADVANES100K9 · Construction Contractor · renews May 2028

AMBIENT AIR HEATING LLCAMBIEAH822BD · Construction Contractor · renews Jan 2028

AMPLIFIED SOUND COAMPLISC302P1 · Electrical Contractor · renews Dec 2026

APL REPAIRS LLCAPLRERL747NM · Construction Contractor · renews Aug 2028

APOLLONIUS LLCAPOLLL*751N9 · Construction Contractor · renews Aug 2027

Air Commodities IncAIRCOCI748BL · Electrical Contractor · renews Jan 2028

BLACK LOTUS HVAC LLCBLACKLH759B9 · Construction Contractor · renews Jan 2027

BULGER SAFE & LOCK INCBULGESL171NQ · Electrical Contractor · renews Nov 2027

Show all 52

CELLO TECHNOLOGIESCELLOT*005NW · Electrical Contractor · renews Feb 2027

CLOUD 9 HEATING & AIR LLCCLOUD9H773CA · Construction Contractor · renews Feb 2027

COFFMAN ENGINEERS INCCOFFMEI866O9 · Construction Contractor · renews Oct 2028

COMFORT TECH HEATING & A/C INCCOMFOTH898CM · Construction Contractor · renews Feb 2027

COMMERCIAL FILTER SALES & SVCCOMMEFS935B5 · Construction Contractor · renews Apr 2027

ELITE HVAC & REFRIGERATION LLCELITEHR741K2 · Construction Contractor · renews May 2028

ENERGY EFFICIENT SYSTEM LLCENERGES843Q9 · Construction Contractor · renews Feb 2027

ENERGY TECHNOLOGIES LLCENERGTL916K1 · Construction Contractor · renews Jul 2027

ENTERO SYSTEM SERVICES INCENTERSS892MH · Construction Contractor · renews Feb 2028

EVERGREEN REFRIGERATION LLCEVERGRL813MA · Electrical Contractor · renews Jul 2027

GENESEE FUEL & HEATING CO, INCGENESI*001L6 · Electrical Contractor · renews Dec 2026

GLENDALE HEATING & A/CGLENDHA003CM · Electrical Contractor · renews Feb 2028

GO GREEN HEATING AC & ELEC LLCGOGREGH752DL · Construction Contractor · renews Apr 2027

GREAT SUN CORPGREATSC951D1 · Construction Contractor · renews Apr 2027

GREENWOOD HTNG & HOME SERVICESGREENHH740DD · Electrical Contractor · renews Apr 2028

GUARDIAN SECURITY SYSTEMS INCGUARDSS233K5 · Electrical Contractor · renews Sep 2028

HINES INTERESTS LPHINESIL981UQ · Electrical Contractor · renews Apr 2028

JABCO CONSTRUCTIONJABCOC*875RL · Electrical Contractor · renews Dec 2027

JOANIS MECHANICAL LLCJOANIML891D3 · Construction Contractor · renews May 2027

LONG EQUIPMENT REPAIR PLLCLONGEER778J5 · Construction Contractor · renews Apr 2027

LUNA HOME COMFORT LLCLUNAHHC754QQ · Construction Contractor · renews Nov 2027

METHOD ENERGY LLCMETHOEL771ME · Construction Contractor · renews Aug 2027

MINI SPLIT PROSMINISSP744L4 · Construction Contractor · renews Jul 2028

NEUDORFER ENGINEERS LLCNEUDOEL787LN · Construction Contractor · renews Jun 2028

OCEAN PARK MECHANICAL INCOCEANPM902D6 · Electrical Contractor · renews Mar 2028

ONE HOUR HTG & A/C OF CTRL SEAONEHOHH741CL · Electrical Contractor · renews Feb 2028

Olson Energy Serv/Gas Appl SvcOLSONES863OD · Construction Contractor · renews Sep 2028

PRO HEAT LLCPROHEHL932JZ · Construction Contractor · renews Nov 2027

PRO-STAFF MECHANICAL INCPROSTMI006C8 · Electrical Contractor · renews Mar 2028

PROGRESSIVE COMFORT SOLUTIONSPROGRCS7827L · Electrical Contractor · renews Jan 2027

PROGRESSIVE COMFORT SOLUTIONSPROGRCS863J1 · Construction Contractor · renews Jun 2028

PSR MECHANICAL LLCPSRMEML804DS · Electrical Contractor · renews Mar 2028

REFRIGERATION DOCTORREFRID*782OA · Construction Contractor · renews Oct 2028

SNO VALLEY PROCESS SOLUTIONSSNOVAVP751BM · Electrical Contractor · renews Jan 2027

SOUND OIL COSOUNDOC016PH · Electrical Contractor · renews Aug 2028

UNI REFRIGERATIONUNIRER*919PA · Construction Contractor · renews Oct 2027

UNITED SYSTEMS MECHANICAL LLCUNITESM813QO · Electrical Contractor · renews Nov 2027

VENT SERVICESVENTSS*756RT · Construction Contractor · renews Jan 2028

WESTWORLD AIRWORKS LLCWESTWAL757P8 · Construction Contractor · renews Oct 2027

WILLIAMSON LANDSCAPE ARCH LLCWILLILA996RU · Electrical Contractor · renews Dec 2027

Common problems

No heat?AC or heat pump not cooling?

Other pros in Seattle

Tree services Garage door companies Plumbers Electricians Septic and side-sewer contractors

Common questions

How many HVAC companies are registered in Seattle?

52 with a Seattle business address, as of October 16, 2026. Many more from nearby towns also work in Seattle.

How do I check an HVAC company's registration?

Ask for their registration number and look it up on Check a contractor or L&I's Verify a Contractor. An active registration means they carry the bond and liability insurance the state requires.

Does Check the Pro send my request to several companies?

No. Each request goes to one registered local pro. If they can't take it, we find another.

Get one registered pro to call me