Updated: Jun 26, 2026
Location and Projects
Address
7950 Cessna Ave, Gaithersburg, MD, 20879
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Michael Bonsby Heating and Air Conditioning LLC
With over two decades of HVAC industry experience, Michael Bonsby Heating & Air Conditioning provides homeowners and business owners alike throughout the Montgomery County, MD, and Washington, DC, area with top quality heating, air conditioning, and plumbing services.
From BuildZoom: Michael Bonsby Heating and Air Conditioning LLC, 7950 Cessna Ave, Gaithersburg, MD (Owned by: Michael David Bonsby) holds a Heating, Ventilation, Air Conditioning And Refrigeration license and 4 other licenses according to the Maryland license board.
Their BuildZoom score of 107 ranks in the top 6% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Michael Bonsby Heating and Air Conditioning LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Michael Bonsby Heating and Air Conditioning LLC Services
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Michael Bonsby Heating and Air Conditioning LLC Contact Information
Phone Number: (240) 688-8761
Address: 7950 Cessna Ave, Gaithersburg, MD 20879
Michael Bonsby Heating and Air Conditioning LLC Gaithersburg
Quality
107
94th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Michael Bonsby Heating and Air Conditioning LLC has a BuildZoom score of 107, which places them above 94% of 58,058 contractors in Maryland.
Activity
|
16 projects
|
2025 |
|
9 projects
|
2024 |
|
30 projects
|
2023 |
Our building permit records indicate that Michael Bonsby Heating and Air Conditioning LLC has worked on at least
55.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
49 projects
|
HVAC projects |
|
8 projects
|
Mechanical projects |
Analyzing permits over the last 4 years shows that Michael Bonsby Heating and Air Conditioning LLC mostly works on
hvac project
and mechanical project
projects.
Pricing
|
7 projects
|
$5k-$20k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $11,627. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
Building Permits by Michael Bonsby Heating and Air Conditioning LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
In kind replacement mini split system. mitsubishi multi zone mx series - 24k btu: multi zone heat pump: ntxmmx24a132a (1) mitsubishi multi zone - 06k btu - st series: wall mounted air handler: naxwst06a112aa (3)
Valuation:
N/A
Permit #:
M25000091
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Residential hvac addition alteration permit
2025-02-27
(replacements) - multi zone heat pump: ntxmmx36a142a wall mounted air handler: naxwst12a112aa wall mounted air handler: naxwst09a112aa wall mounted air handler: naxwst09a112aa
Valuation:
N/A
Permit #:
M25000253
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replacement of air conditioning gas furnace and coil. silver 14 air conditioner: 4a7a4024n1000a (seer2 compliant) s8x1 gas furnace: s8x1a404m3 comfort coil: ahri matched
Valuation:
N/A
Permit #:
M25000032
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replace heat pump platinum 18 heat pump: 5a6v8x48a1000a and air handler platinum 5tamx air handler: 5tamxd05av41
Valuation:
N/A
Permit #:
M25000583
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
4a6h6048n1000aa: american standard heat pump s9x2b080u4psbba: american standard gas furnace (replacement)
Valuation:
N/A
Permit #:
M25000262
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replacement of air conditioning coil and furnace 14 seer air conditioner: a5ac4030a1000a comfort coil: 5txcb003 american standard s9x1b080u4 furnace
Valuation:
N/A
Permit #:
M25001211
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Residential hvac addition alteration permit
2025-01-20
Replacement in kind of heat pump and air handler air handler model tem6a083 heat pump 4a6h5030n1000aa
Valuation:
N/A
Permit #:
M25000073
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Silver 15 heat pump: 4a6h5024n1000a silver tem6 air handler replacement (upper level). platinum 18 heat pump: 4a6v8x48a1000a platinum tamx air handler: tamxa0c48v41da replacement (lower level)
Valuation:
N/A
Permit #:
M24001403
Status:
complete
Fee:
$138
Permit Type:
N/A
Building Type:
N/A
Replacement of air conditioning coil and gas furnace ac: 5a7a5048n1000a gas furnace s8x2c080m5
Valuation:
N/A
Permit #:
M25000860
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replace existing equipment and replace ductowrk as needed. units #203/303/403/404...4 units total equipment info: goodman : awst24su1405 and goodman: gszb402410 new equipment will be connected to the existing line set **amend permit to include unit #103 for a total of 5 units instead of 4**10-26-23
Valuation:
N/A
Permit #:
M23001084
Status:
complete
Fee:
$490
Permit Type:
N/A
Building Type:
N/A
Replacement ductless heat pump and 3 ceiling cassettes mitsubishi ductless heat pump mxz-3d24nl ceiling cassette mlz-kx06nl (3)
Valuation:
N/A
Permit #:
M25001205
Status:
issued
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Heat pump: 5a6h4042n1000a tem4 air handler: 5tem4d05ac41 replacement in kind
Valuation:
N/A
Permit #:
M25000328
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Residential building new - single family detached
2025-11-18
Requesting a permit to built a new house
Valuation:
$345,237
Permit #:
BRN-32203-2023
Status:
final
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Replace water service from curb stop to inside basement
Valuation:
N/A
Permit #:
P25002288
Status:
complete
Fee:
$55
Permit Type:
N/A
Building Type:
N/A
(replacement) model number aszv904810aa serial number 2301168473 daikin comfort heat pump 4 ton heat pump with cruise control compressor & air handler
Valuation:
N/A
Permit #:
M24000670
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replacement of heat pump and air handler heat pump: 5a6h4030n1000a air handler: 5tem4b03ac31
Valuation:
N/A
Permit #:
M25001185
Status:
applied
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Replacement and installation of heat pump model 4a6h6048n1000aa and air handler model tem6a0c48h41sc
Valuation:
N/A
Permit #:
M24001210
Status:
complete
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Request for mechanical permit for replacement air conditioning and furnace
Valuation:
$11,682
Permit #:
MECH-30934-2023
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Request for mechanical permit for replace furnace and air conditioning
Valuation:
$8,995
Permit #:
MECH-30312-2023
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install a budget 3 ton 80% 80k btu hvac system
Valuation:
N/A
Permit #:
2024-8971-MEC
Status:
plancheck
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Michael Bonsby Heating and Air Conditioning LLC Reviews
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Michael Bonsby Heating and Air Conditioning LLC License info
Verified License
| License # | 21796 |
| Status | Active |
| State | Maryland |
| Type | Heating, Ventilation, Air Conditioning And Refrigeration |
| Business Type | Other |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Michael Bonsby Heating and Air Conditioning LLC at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 133412 |
| Status | Active |
| State | Maryland |
| Type | Contractor (Corppart) Home Improvement |
| Business Type | Other |
- When BuildZoom last verified this license, it had an expiration date of May, 2018. Check the current license status of Michael Bonsby Heating and Air Conditioning LLC with the Maryland Department of Labor, Licensing & Regulation
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-4420 |
| Status | Inactive |
| City | Annapolis |
| Type | Plumber |
| Business Type | Other |
- According to the The City of Annapolis, MD, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Michael Bonsby Heating and Air Conditioning LLC at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | PA056363 |
| Status | Inactive |
| State | Pennsylvania |
| Business Type | Other |
- According to the Pennsylvania Office of the Attorney General, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Michael Bonsby Heating and Air Conditioning LLC at the Pennsylvania Office of the Attorney General.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 111442 |
| Status | Inactive |
| State | Maryland |
| Type | Home Improvement |
| Business Type | Other |
- According to the Maryland Department of Labor, Licensing & Regulation, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Michael Bonsby Heating and Air Conditioning LLC at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
107
BuildZoom Score
Insured
| Insurer | Erie |
| Insured up to | $1,000,000 |
686
Permits
- Building permit records show that Michael Bonsby Heating and Air Conditioning LLC has worked on 686 permitted projects.
Michael Bonsby Heating and Air Conditioning LLC Employees
MA
Michael Bonsby Heating And Air
Owner
MB
Michael D. Bonsby
Owner
MB
Michael David Bonsby
Owner