Updated: Jun 03, 2026
Location and Projects
Address
4030 W FREISTADT RD, Mequon, WI, 53092
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Ernster Htg & Ac Construction
Ernster Htg & Ac, 4030 W Freistadt Rd, Mequon, WI (Owned by: David P Ernster) holds a Hvac Contractor, Regular, False license and 4 other licenses according to the Wisconsin Rapids license board.
Their BuildZoom score of 95 ranks in the top 22% of 94,017 Wisconsin licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Ernster Htg & Ac, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Ernster Htg & Ac Services
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Ernster Htg & Ac Contact Information
Phone Number: (414) 351-4303
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Address: 4030 W FREISTADT RD, Mequon, WI 53092
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Install boiler and backflow device
Valuation:
N/A
Permit #:
P22-2158
Status:
final
Fee:
$65
Permit Type:
Boiler
Building Type:
N/A
Install water heater
Valuation:
N/A
Permit #:
P22-2159
Status:
final
Fee:
$65
Permit Type:
Water heater
Building Type:
N/A
No Description Available
Valuation:
$10,185
Permit #:
BLR-21-00039
Status:
complete
Fee:
$88
Permit Type:
N/A
Building Type:
Multi use
No Description Available
Valuation:
$10,185
Permit #:
BLR-21-00038
Status:
complete
Fee:
$88
Permit Type:
N/A
Building Type:
Multi use property
Install 2 furnaces
Valuation:
$6,400
Permit #:
P19-0215
Status:
final
Fee:
$80
Permit Type:
Furnace
Building Type:
N/A
Install two mini split air conditioning units
Valuation:
$16,000
Permit #:
HVAC-GEN-17-01337
Status:
complete
Fee:
$125
Permit Type:
N/A
Building Type:
N/A
Furnace install
Valuation:
$2,410
Permit #:
HVAC-GEN-16-00280
Status:
complete
Fee:
$5
Permit Type:
N/A
Building Type:
N/A
Test
Valuation:
$12
Permit #:
ELEC-16-00230
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Test
Valuation:
N/A
Permit #:
ELEC-16-01124
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Ernster Htg & Ac Reviews
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Verified License
BuildZoom confirmed this contractor's license
Ernster Htg & Ac License info
Verified License
| License # | 243709 - HVACCONT |
| Status | Active |
| City | Wisconsin Rapids |
| Type | Hvac Contractor, Regular, False |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Ernster Htg & Ac at the City of Wisconsin Rapids.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 243709-HVACCONT |
| Status | Active |
| State | Wisconsin |
| Type | Hvac Contractor |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Ernster Htg & Ac at the Wisconsin Department of Safety and Professional Services.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| Status | Active |
| City | Milwaukee |
| Type | Home Improvement Contractor's License |
- When BuildZoom last verified this license, it had an expiration date of February, 2022. Check the current license status of Ernster Htg & Ac with the City of Milwaukee License Search
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 243709 |
| 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 Ernster Htg & Ac at the City of Milwaukee License Search.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | Milwaukee |
| Type | Home Improvement Contractor's License |
- 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.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
6
Permits
- Building permit records show that Ernster Htg & Ac has worked on 6 permitted projects.
Ernster Htg & Ac Employees
DE
David Ernster
DE
David P Ernster
Owner