Thomas Mechanical LLC
Heat pump installer based in Arlington.
- License THOMAML855OP, expired in the state's records on Oct 3, 2026
- No current bond on the state's list for this license
63 heat pump jobs on Seattle permits, 2021 to 2025.
The state showed this license as "expired" on Oct 3, 2026. Do not hire until that is cleared.
What the public records show
From the state's license records and the city's permits, one question at a time.
| Question | Records show | Mark |
|---|---|---|
| Licensed? | License THOMAML855OP, expired in the state's records on Oct 3, 2026Heating/Vent/Air-Conditioning and Refrig (HVAC/R) | Problem |
| Insurance and bond? | No current bond on the state's list for this licenseNo liability insurance policy on the state's list for this license. | Ask them |
| Jobs on record | 63 heat pump jobs on Seattle permits, 2021 to 2025Every permit we have for them is heat pump.They are based in Arlington. Work outside Seattle is not in these records.Our Seattle permit records cover October 2021 to October 2026.Of their 63 heat pump permits, 41 mention ductless or mini-split units. |
Records: the state Department of Labor and Industries and City of Seattle permits.
Cost and timing
All heat pump jobs in Seattle: $6,000 to $15,000
Half of 25,747 city permits list an amount in this range. Permit amounts are often lower than what you pay.
- Ductless mini-splits in Seattle: $6,000 to $15,000 (10,687 permits)
- Ducted heat pumps in Seattle: $9,000 to $22,000 (591 permits)
How to read this range
Contractors write a job value on the permit form, and the city uses it to set the permit fee. It is not the contract price, and it is often lower than what you pay. A quarter of the permits list less than this range, and a quarter list more. Use it to see if a quote is in the normal range.
Rebates
Seattle's Clean Heat Program: $2,000 off for most homes that switch from oil heat to a Mitsubishi Electric heat pump. Households earning 81% to 150% of the area median income get $4,000 more, $6,000 in all. The install must be finished by May 30, 2027, by one of the program's participating contractors.
As the city's page read in October 2026. Check it for changes.
Permit value (not a price)
Their typical permit lists $18,000 (half list more, half less)
That is the figure written on the permit form, which can be far from what you pay. What heat pump jobs cost in Seattle.
Get 2 or 3 written quotes.
Permit timeline
Across Seattle, a heat pump permit stays open about 87 days, from permit to final inspection
This is not how long the crew works at your home: most of it is waiting for the inspection. Ask them how many days the work takes. The permit itself is usually issued the same day. How long heat pump jobs take.
Track record
0 jobs in the last 12 months, down from 9 the year before
Where they work most
- 9810612 jobs
- 9811510 jobs
- 981175 jobs
- 981445 jobs
- 981074 jobs
Latest jobs
Permit values are what the contractor wrote on the permit form, not what the owner paid.
A row marked ×2 or more stands for that many similar jobs on one day in one ZIP code.
| Date | Work | ZIP | On the permit form |
|---|---|---|---|
| Sep 16, 2025 | Heat pumpInstall 1 new mini split heat pump | Not listed | $9,000 |
| Aug 12, 2025 | Heat pump (×2, same day)Install one new mini split heat pump | 98107 | $15,000 each |
| Aug 7, 2025 | Heat pumpInstall one new mini split heat pump | 98107 | $15,000 |
| Aug 7, 2025 | Heat pumpInstall 1 new mini split heat pump | 98107 | $15,000 |
| Apr 10, 2025 | Heat pumpInstallation of 2 new Roof top Unit Heat Pumps | 98105 | $82,000 |
| Jan 30, 2025 | Heat pumpInstall 1 new mini split heat pump | 98122 | $9,000 |
| Jan 8, 2025 | Heat pumpInstall 2 new heat pumps and 2 new air handlers | 98112 | $40,000 |
| Jan 8, 2025 | Heat pumpInstall 1 new heat pump | 98112 | $10,000 |
| Jul 24, 2024 | Heat pumpInstall one new heat pump | 98112 | $20,000 |
| Jul 17, 2024 | Heat pump | 98115 | $10,000 |
| May 29, 2024 | Heat pumpInstall one new mini split heat pump | 98117 | $5,000 |
| May 8, 2024 | Heat pumpInstall 2 new mini split heat pumps, one hrv, 2 bath fans, 1 whole house fan, and range venting | 98112 | $30,000 |
| Apr 8, 2024 | Heat pumpInstall 2 new mini spit heat pumps and 4 bath fans | 98126 | $20,000 |
| Feb 29, 2024 | Heat pumpInstall 1 new heat pump | 98144 | $10,000 |
| Dec 27, 2023 | Heat pumpInstall 1 new mini split heat pump | 98122 | $9,500 |
| Jul 19, 2023 | Heat pumpInstall 1 new mini split heat pump | 98126 | $15,000 |
| Jun 8, 2023 | Heat pump (×4, same day) | 98115 | $10,000 each |
| May 2, 2023 | Heat pump (×8, same day) | 98106 | $10,000 each |
| Apr 24, 2023 | Heat pump (×4, same day) | 98106 | $20,000 each |
| Feb 9, 2023 | Heat pumpInstall new mini split heat pump | 98117 | $18,000 |
| Nov 17, 2022 | Heat pump | 98115 | $50,000 |
| Sep 22, 2022 | Heat pump (×2, same day) | 98116 | $20,000 each |
| Sep 7, 2022 | Heat pump (×2, same day) | Not listed | $20,000 each |
| Jul 18, 2022 | Heat pump | 98136 | $18,000 |
| Jul 18, 2022 | Heat pumpInstall 2 new mini split heat pumps, 8 fans, range and dryer venting | Not listed | $30,000 |
| Jun 23, 2022 | Heat pump (×2, same day) | 98116 | $25,000 each |
| Jun 21, 2022 | Heat pumpInstall 2 new mini split heat pumps, 5 bath fans, 1 whole house fan, dryer venting, range venting,… | 98117 | $30,000 |
| May 20, 2022 | Heat pumpInstall 2 new mini split heat pumps | 98199 | $30,000 |
| May 20, 2022 | Heat pumpInstall (1) heat pump A/C unit | 98125 | $10,000 |
| May 17, 2022 | Heat pump | Not listed | $10,000 |
| May 4, 2022 | Heat pumpInstall 2 new mini split heat pumps, 6 fans, and range venting | 98115 | $30,000 |
| May 3, 2022 | Heat pump | 98125 | $20,000 |
| Apr 28, 2022 | Heat pump | 98105 | $40,000 |
| Apr 21, 2022 | Heat pumpInstall 1 new mini split heat pump | 98115 | $10,000 |
| Apr 18, 2022 | Heat pump | 98103 | $10,000 |
| Mar 29, 2022 | Heat pump | 98144 | $10,000 |
| Mar 29, 2022 | Heat pump | 98103 | $20,000 |
| Mar 29, 2022 | Heat pumpInstall 2 new heat pumps, 6 fans and range venting | 98103 | $20,000 |
| Mar 15, 2022 | Heat pump (×2, same day) | 98115 | $20,000 each |
| Feb 3, 2022 | Heat pump (×2, same day)Install one new heat pump, 3 bath fans, 1 whole house fan, range venting and dryer venting | 98144 | $18,000 each |
What to ask before you hire
About Thomas Mechanical LLC
- Do not hire until the state shows the license as active.
- Ask for proof of liability insurance and a current bond.
- Ask whether they are on the city's participating list, which rebates apply to your job, and who files the paperwork.
- Ask what the warranty covers and for how long, in writing.
- Search their name on the Better Business Bureau site, and read their reviews.
Worth asking any heat pump installer
- What size unit, and did you measure the house to choose it?
- Do my ducts or my electrical panel need work first?
- Who pulls the permit, and what rebates apply?
Get a quote from Thomas Mechanical LLC
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