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Best HVAC contractors in Seattle, WA

A ranked shortlist of licensed HVAC contractors for someone hiring or vetting in Seattle. Ranked on an active L&I class for the work and job-relevant Seattle city building records, not reviews, ads, or a workmanship guarantee.

Seattle city building records through 2026-10-19, verified against the Washington State Department of Labor & Industries licensing records, snapshot dated 2026-08-16. Ranking reflects license standing and city building records, not a workmanship guarantee. This week's Seattle city building records.

Which HVAC contractor has done the most HVAC jobs in Seattle?

Ballard Natural Gas Srvc Inc has done the most HVAC jobs in Seattle of any firm holding the matching L&I class: 5,527 jobs, most recently in 2026. It has held L&I license BALLANG062QD for 31 years.

That count includes only city building records whose type matches HVAC work in Seattle's own records, and only firms that hold the matching L&I class as a primary or tied specialty, so a firm with a larger pile of unrelated jobs does not rank here. Jobs are counted per license number, and a firm holding several licenses is counted on its busiest one. Seattle records run through 2026-10-19.

See Ballard Natural Gas Srvc Inc's license and job record →

Most HVAC jobs in Seattle, all city records on file, among licensed HVAC contractors

  1. 1Ballard Natural Gas Srvc Inc

    L&I BALLANG062QD · 5,527 jobs · 2026-10-19

  2. 2Northshore Heating LLC

    L&I NORTHHL955JK · 2,499 jobs · 2026-10-19

  3. 3Go Green Heating AC & Elec LLC

    L&I GOGREGH752DL · 2,130 jobs · 2026-10-16

  4. 4Nelson Heating LLC

    L&I NELSOHL853DK · 995 jobs · 2026-10-07

  5. 5Progressive Comfort Solutions

    L&I PROGRCS863J1 · 923 jobs · 2026-10-02

  6. 6New Era Elite Inc

    L&I NEWEREE741B6 · 860 jobs · 2026-05-20

  7. 7Airpros Energy LLC

    L&I AIRPREL909D3 · 710 jobs · 2026-10-02

  8. 8Vlad HVAC LLC

    L&I VLADHHL855KQ · 654 jobs · 2026-10-14

  9. 9Gfr Heating & Cooling LLC

    L&I GFRHEHC951CM · 335 jobs · 2026-09-22

  10. 10Energy Technologies LLC

    L&I ENERGTL916K1 · 321 jobs · 2021-12-23

  11. 11Cascade Energy Services LLC

    L&I CASCAES843M6 · 318 jobs · 2026-09-29

  12. 12Aircon Electric LLC

    L&I AIRCOEL855RN · 241 jobs · 2021-06-29

  13. 13Atmospheric Heating Inc

    L&I ATMOSHI932JO · 236 jobs · 2026-09-30

  14. 14New Era HVAC Supreme Inc

    L&I NEWEREH772QP · 211 jobs · 2026-02-09

  15. 15Great Sun Corp

    L&I GREATSC951D1 · 192 jobs · 2026-02-20

Get a shortlist matched to your address

First one free

This list is city-wide for Seattle. Enter your address and we will narrow it to HVAC contractors who have done jobs near you, check every license for standing and disciplinary history, and hand back a ranked shortlist you can call.

No card needed. See a finished report first if you'd rather.

Top 15 HVAC contractors by Seattle job history

  1. Ballard Natural Gas Srvc Inc

    L&I BALLANG062QD

    Lynnwood, WA

    31 yrs licensed5,527 relevant jobs6,961 total jobsLast job 2026

    Job types: Boiler/pressure Vessel, Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  2. Northshore Heating LLC

    L&I NORTHHL955JK

    Arlington, WA

    21 yrs licensed2,499 relevant jobs2,506 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  3. Go Green Heating AC & Elec LLC

    L&I GOGREGH752DL

    Seattle, WA

    1 yr licensed2,130 relevant jobs2,299 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  4. Nelson Heating LLC

    L&I NELSOHL853DK

    Kalispell, MT

    11 yrs licensed995 relevant jobs1,016 total jobsLast job 2026

    Job types: Boiler/pressure Vessel, Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  5. Progressive Comfort Solutions

    L&I PROGRCS863J1

    Seattle, WA

    12 yrs licensed923 relevant jobs966 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  6. New Era Elite Inc

    L&I NEWEREE741B6

    Gold Bar, WA

    0 yrs licensed860 relevant jobs860 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  7. Airpros Energy LLC

    L&I AIRPREL909D3

    Everett, WA

    16 yrs licensed710 relevant jobs831 total jobsLast job 2026

    Job types: Boiler/pressure Vessel, Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  8. Vlad HVAC LLC

    L&I VLADHHL855KQ

    Edgewood, WA

    11 yrs licensed654 relevant jobs692 total jobsLast job 2026

    Job types: Mechanical, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  9. Gfr Heating & Cooling LLC

    L&I GFRHEHC951CM

    Milton, WA

    21 yrs licensed335 relevant jobs358 total jobsLast job 2026

    Job types: Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  10. Energy Technologies LLC

    L&I ENERGTL916K1

    Seattle, WA

    17 yrs licensed321 relevant jobs400 total jobsLast job 2021

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  11. Cascade Energy Services LLC

    L&I CASCAES843M6

    Lake Stevens, WA

    10 yrs licensed318 relevant jobs318 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  12. Aircon Electric LLC

    L&I AIRCOEL855RN

    Battleground, WA

    10 yrs licensed241 relevant jobs450 total jobsLast job 2021

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  13. Atmospheric Heating Inc

    L&I ATMOSHI932JO

    Marysville, WA

    19 yrs licensed236 relevant jobs253 total jobsLast job 2026

    Job types: Mechanical, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  14. New Era HVAC Supreme Inc

    L&I NEWEREH772QP

    Snohomish, WA

    2 yrs licensed211 relevant jobs211 total jobsLast job 2026

    Job types: Mechanical, Refrigeration, Single-family/duplex Furnace

    View license, job history & disciplinary records →

  15. Great Sun Corp

    L&I GREATSC951D1

    Seattle, WA

    21 yrs licensed192 relevant jobs301 total jobsLast job 2026

    Job types: Mechanical

    View license, job history & disciplinary records →

Most established Seattle HVAC contractors

Longest-licensed firms based in Seattle that hold the right L&I class, oldest license first.

How this ranking works

Organic results require an active L&I license, the correct class for the trade as the firm's primary or tied fit (a mechanical company that also holds an electrical license does not lead the electrician list), and at least one job-relevant city building record in this city. They are ranked by the number of relevant jobs, then by how recently the firm worked, then by how long the firm has been licensed. This reflects license standing and real city building records - it is not a workmanship guarantee. L&I does not publish a disciplinary file, so a clean record is not part of this ranking. Promoted entries, when present, are paid placements and are not scored by these rules.

Confidence: high. The job type and the license class both match this trade.

Frequently asked questions

Which HVAC contractor has done the most HVAC jobs in Seattle?
Ballard Natural Gas Srvc Inc has done the most HVAC jobs in Seattle of any firm holding the matching L&I class: 5,527 jobs, most recently in 2026. It has held L&I license BALLANG062QD for 31 years. That count includes only city building records whose type matches HVAC work in Seattle's own records, and only firms that hold the matching L&I class as a primary or tied specialty, so a firm with a larger pile of unrelated jobs does not rank here. Jobs are counted per license number, and a firm holding several licenses is counted on its busiest one. Seattle records run through 2026-10-19.
How are the best HVAC contractors in Seattle ranked?
Organic results require an active L&I license, the correct class for the trade as the firm's primary or tied fit (a mechanical company that also holds an electrical license does not lead the electrician list), and at least one job-relevant city building record in this city. They are ranked by the number of relevant jobs, then by how recently the firm worked, then by how long the firm has been licensed. This reflects license standing and real city building records - it is not a workmanship guarantee. L&I does not publish a disciplinary file, so a clean record is not part of this ranking. Promoted entries, when present, are paid placements and are not scored by these rules.
Is this ranking a guarantee of quality or workmanship?
No. It reflects Washington State Department of Labor & Industries license standing, longevity, and real city building records - not the quality of any individual job. Always verify a contractor on the official L&I Verify a Contractor and check references before hiring.
How current is this Seattle contractor data?
Seattle city building records through 2026-10-19, verified against the Washington State Department of Labor & Industries licensing records, snapshot dated 2026-08-16. The two datasets age separately: the board publishes licensing snapshots on its own cadence, and Seattle publishes city building records on its own. This page regenerates daily.

Other trades in Seattle

Firms licensed for HVAC and another trade are listed on the combo pages above, not as specialists here.