Updated: May 29, 2026
Location and Projects
Address
Earleville, MD, 21919
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John William Hentkowski, Jr HVAC/Mechanical Contractor
John William Hentkowski, Jr, Earleville, MD holds a Heating, Ventilation, Air Conditioning And Refrigeration license according to the Maryland license board.
Their BuildZoom score of 90 indicates that they are licensed or registered but we do not have additional information about them.
Their license was verified as active when we last checked. If you are thinking of hiring John William Hentkowski, Jr, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
John William Hentkowski, Jr Contact Information
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Building Permits by John William Hentkowski, Jr
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replacement of residential heat pump and duct installation for <div><span style="background-color: rgb(229 229 229);">interior renvoation
Valuation:
N/A
Permit #:
202204346
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Heat pump only - construction of addition (used for storage of misc.) entrance way will be through garage door
Valuation:
N/A
Permit #:
202104158
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Replacement of commercial heating and air conditioning systems
Valuation:
N/A
Permit #:
202201602
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Hvac permit for residential for replacement of air conditon only
Valuation:
N/A
Permit #:
202204231
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Hvac permit for residential (replacement of heat pump only)
Valuation:
N/A
Permit #:
202103326
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Hvac permit for residential for replacement of heat pump only
Valuation:
N/A
Permit #:
202204444
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement of heating & air conditioning
Valuation:
N/A
Permit #:
202205406
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement 1 air condition only
Valuation:
N/A
Permit #:
202103211
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Replacement of residential air condition only
Valuation:
N/A
Permit #:
202204050
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement 1 lp gas heating system only & 1 geo thermal
Valuation:
N/A
Permit #:
202041461
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Commercial replacement of heat pump only
Valuation:
N/A
Permit #:
202205665
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement 1 lp gas heating & air condition system
Valuation:
N/A
Permit #:
202041399
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement 1 oil heating & air condition system
Valuation:
N/A
Permit #:
202042670
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Hvac permit for commercial (north east fire company station 4)
Valuation:
N/A
Permit #:
202302133
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Residential replacement heating & air condition system
Valuation:
N/A
Permit #:
202302595
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Heat pump only
Valuation:
N/A
Permit #:
202100118
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Heat pump only
Valuation:
N/A
Permit #:
202102079
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Heat pump only
Valuation:
N/A
Permit #:
202101487
Status:
issued
Fee:
N/A
Permit Type:
Hvacr
Building Type:
N/A
Replacement of heat & air one unit (revision 9/16/16) replacement of heating system only on 1st floor
Valuation:
N/A
Permit #:
201623952
Status:
issued
Fee:
N/A
Permit Type:
HVAC
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
John William Hentkowski, Jr License info
Verified License
| License # | 80654 |
| Status | Active |
| State | Maryland |
| Type | Heating, Ventilation, Air Conditioning And Refrigeration |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for John William Hentkowski, Jr at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
90
BuildZoom Score
17
Permits
- Building permit records show that John William Hentkowski, Jr has worked on 17 permitted projects.