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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 permits, not reviews, ads, or a workmanship guarantee.

Seattle permit records through 2026-08-27, verified against the Washington State Department of Labor & Industries licensing records, snapshot dated 2026-08-16. Ranking reflects license standing and permit history, not a workmanship guarantee. This week's Seattle permit activity.

Which HVAC contractor has pulled the most HVAC permits in Seattle?

Ballard Natural Gas Srvc Inc has pulled the most HVAC permits in Seattle of any firm holding the matching L&I class: 5,382 permits, most recently in 2026. It has held L&I license BALLANG062QD for 31 years.

That count includes only permits 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 permits does not rank here. Permits are counted per license number, and a firm holding several licenses is counted on its busiest one. Seattle records run through 2026-08-27.

See Ballard Natural Gas Srvc Inc's license and permit record →
Most HVAC permits in Seattle, last 12 months of records, among licensed HVAC contractors
RankFirmLicenseRelevant permitsMost recent
1Ballard Natural Gas Srvc IncL&I BALLANG062QD5,3822026-08-27
2Northshore Heating LLCL&I NORTHHL955JK2,4752026-08-17
3Go Green Heating AC & Elec LLCL&I GOGREGH752DL2,1042026-08-27
4Nelson Heating LLCL&I NELSOHL853DK9912026-08-26
5Comfy Air LLCL&I COMFYAL843O89212026-08-27
6Progressive Comfort SolutionsL&I PROGRCS863J19132026-08-24
7New Era Elite IncL&I NEWEREE741B68602026-05-20
8Airpros Energy LLCL&I AIRPREL909D37002026-08-21
9Vlad HVAC LLCL&I VLADHHL855KQ6312026-08-12
10Energy Technologies LLCL&I ENERGTL916K13212021-12-23
11Cascade Energy Services LLCL&I CASCAES843M63152026-05-16
12Aircon Electric LLCL&I AIRCOEL855RN2412021-06-29
13Atmospheric Heating IncL&I ATMOSHI932JO2342026-07-28
14New Era HVAC Supreme IncL&I NEWEREH772QP2112026-02-09
15New Castle Mechanical LLCL&I NEWCACM924OD2042026-08-07

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First one free

This page ranks all of Seattle. Enter your address and we'll narrow it to HVAC contractors who have pulled permits near you, check every license for standing and disciplinary history, and hand back a ranked shortlist you can call.

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Top 15 HVAC contractors by Seattle permit history

  1. Ballard Natural Gas Srvc Inc

    L&I BALLANG062QD

    Lynnwood, WA

    31 yrs licensed5,382 relevant permits6,778 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  2. Northshore Heating LLC

    L&I NORTHHL955JK

    Arlington, WA

    21 yrs licensed2,475 relevant permits2,482 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  3. Go Green Heating AC & Elec LLC

    L&I GOGREGH752DL

    Seattle, WA

    1 yr licensed2,104 relevant permits2,257 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  4. Nelson Heating LLC

    L&I NELSOHL853DK

    Kalispell, MT

    11 yrs licensed991 relevant permits1,012 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  5. Comfy Air LLC

    L&I COMFYAL843O8

    Tacoma, WA

    9 yrs licensed921 relevant permits932 total permitsLast permit 2026

    Permit types: Mechanical, Single-family/duplex Furnace

    View license, permit history & disciplinary records →

  6. Progressive Comfort Solutions

    L&I PROGRCS863J1

    Seattle, WA

    12 yrs licensed913 relevant permits956 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  7. New Era Elite Inc

    L&I NEWEREE741B6

    Gold Bar, WA

    0 yrs licensed860 relevant permits860 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  8. Airpros Energy LLC

    L&I AIRPREL909D3

    Everett, WA

    16 yrs licensed700 relevant permits821 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  9. Vlad HVAC LLC

    L&I VLADHHL855KQ

    Edgewood, WA

    11 yrs licensed631 relevant permits668 total permitsLast permit 2026

    Permit types: Mechanical, Single-family/duplex Furnace

    View license, permit history & disciplinary records →

  10. Energy Technologies LLC

    L&I ENERGTL916K1

    Seattle, WA

    17 yrs licensed321 relevant permits398 total permitsLast permit 2021

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

    View license, permit history & disciplinary records →

  11. Cascade Energy Services LLC

    L&I CASCAES843M6

    Lake Stevens, WA

    10 yrs licensed315 relevant permits315 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  12. Aircon Electric LLC

    L&I AIRCOEL855RN

    Battleground, WA

    10 yrs licensed241 relevant permits450 total permitsLast permit 2021

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

    View license, permit history & disciplinary records →

  13. Atmospheric Heating Inc

    L&I ATMOSHI932JO

    Marysville, WA

    19 yrs licensed234 relevant permits251 total permitsLast permit 2026

    Permit types: Mechanical, Single-family/duplex Furnace

    View license, permit history & disciplinary records →

  14. New Era HVAC Supreme Inc

    L&I NEWEREH772QP

    Snohomish, WA

    2 yrs licensed211 relevant permits211 total permitsLast permit 2026

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

    View license, permit history & disciplinary records →

  15. New Castle Mechanical LLC

    L&I NEWCACM924OD

    Puyallup, WA

    17 yrs licensed204 relevant permits229 total permitsLast permit 2026

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

    View license, permit 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 building permit in this city's records. They are ranked by the number of relevant permits, then by how recently the firm worked, then by how long the firm has been licensed. This reflects license standing and real permit history - 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 permit type and the license class both match this trade.

Frequently asked questions

Which HVAC contractor has pulled the most HVAC permits in Seattle?
Ballard Natural Gas Srvc Inc has pulled the most HVAC permits in Seattle of any firm holding the matching L&I class: 5,382 permits, most recently in 2026. It has held L&I license BALLANG062QD for 31 years. That count includes only permits 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 permits does not rank here. Permits are counted per license number, and a firm holding several licenses is counted on its busiest one. Seattle records run through 2026-08-27.
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 building permit in this city's records. They are ranked by the number of relevant permits, then by how recently the firm worked, then by how long the firm has been licensed. This reflects license standing and real permit history - 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 building-permit history - 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 permit records through 2026-08-27, 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 permits 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.