Updated: Jul 15, 2026
Location and Projects
Address
Fond Du Lac, WI, 54935
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Merwin Oil Co HVAC/Mechanical Contractor
Merwin Oil Co LLC, Fond Du Lac, WI (Owned by: Gary L Merwin) holds a Hvac Contractor, Regular, False license and 3 other licenses according to the Wisconsin Rapids license board.
Their BuildZoom score of 93 ranks in the top 27% of 94,017 Wisconsin licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Merwin Oil Co LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Merwin Oil Co LLC Contact Information
Phone Number: (920) 929-6100
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace existing furnace
Valuation:
$3,004
Permit #:
201806666
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install goodman air conditioner
Valuation:
$2,874
Permit #:
201604319
Status:
issued 9/1/2016
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
We are replacing the customer's furnace.
Valuation:
$3,170
Permit #:
201500306
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Phase 2 - (304) install exhaust fan in private toilet room and relocate diffusers in existing office. this work will be shown on future phase 3 plans to be submitted.
Valuation:
$1,500
Permit #:
132268
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace furnace
Valuation:
$3,190
Permit #:
201402287
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install 12 infra-red heaters, 1-mua and 2 fan exhaust system in shop. install 2 fa furnaces and a/c in the office. early start - need stamped state approved plan.
Valuation:
$79,800
Permit #:
120511
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Comm (multifamily #2220) - replace one of 4 furnaces. eiv provided by witzke electric.
Valuation:
$2,400
Permit #:
123728
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Single family residence replace furnace. eiv signed by witzke electric
Valuation:
$3,400
Permit #:
139098
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install new duct runs and diffusers for existing rtu's in the north portion of the building as per plans
Valuation:
$10,300
Permit #:
133365
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
300 n koeller - ntd - install 2-rtu's, unit heater, mini-split a/c, and 3 exhuast fans per plans.
Valuation:
$24,665
Permit #:
129914
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Comm / early start - install 2 - rtu's, make-up air, kitchen hood, and bathroom exhaust.
Valuation:
$29,430
Permit #:
121127
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Comm (multi-family at 2220) / replace furnace, eiv provided by witzke electric check #4335
Valuation:
$2,400
Permit #:
123312
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Impromed (#304) / replace roof top unit. this is covered under state plan f2-2536-0908-h.
Valuation:
$5,260
Permit #:
134234
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Duplex / replace furnace, eiv signed by witzke electric check #7184
Valuation:
$2,535
Permit #:
148279
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Impromed / early start / install new ductwork and difusers, test and balance system.
Valuation:
$6,350
Permit #:
131604
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Sfr/ replacing the furnace. witzke will be doing any electric hookup.
Valuation:
$2,000
Permit #:
117800
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Single family residence replace furnace eiv signed by witzke electric
Valuation:
$2,664
Permit #:
125887
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Merwin Oil Co LLC License info
Verified License
| License # | 8827 - HVACCONT |
| Status | Active |
| City | Wisconsin Rapids |
| Type | Hvac Contractor, Regular, False |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Merwin Oil Co LLC at the City of Wisconsin Rapids.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 8827-HVACCONT |
| Status | Active |
| State | Wisconsin |
| Type | Hvac Contractor |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Merwin Oil Co LLC at the Wisconsin Department of Safety and Professional Services.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 8827 |
| Status | Inactive |
| City | Milwaukee |
| Type | Hvac Contractor |
- According to the City of Milwaukee License Search, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Merwin Oil Co LLC at the City of Milwaukee License Search.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 8827-LGS |
| Status | Inactive |
| State | Wisconsin |
| Type | Liquefied Gas Supplier |
- According to the Wisconsin Department of Safety and Professional Services, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Merwin Oil Co LLC at the Wisconsin Department of Safety and Professional Services.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
12
Permits
- Building permit records show that Merwin Oil Co LLC has worked on 12 permitted projects.
Merwin Oil Co LLC Employees
GM
Gary L Merwin
Owner
GM
Gary Merwin