Updated: May 27, 2026
Location and Projects
Address
119 E. Brockett, Sherman, TX, 75090
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Markl & Sons Cooling and Heating
Markl & Sons Cooling and Heating, 119 E Brockett, Sherman, TX (Owned by: Markl, Donald Randolph) holds a Air Conditioning/Refrigeration Contractor license and 7 other licenses according to the Texas license board.
Their BuildZoom score of 103 ranks in the top 10% of 222,249 Texas licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Markl & Sons Cooling and Heating, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Markl & Sons Cooling and Heating Services
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Markl & Sons Cooling and Heating Contact Information
Phone Number: (903) 893-2250
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Address: 119 E. Brockett, Sherman, TX 75090
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Building Permits by Markl & Sons Cooling and Heating
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace existing 3ton gas furnace and 3ton r-22 evaporator coil with new 3ton 80% gas furnace and 3ton 410a evaporator coil
Valuation:
N/A
Permit #:
23-02796
Status:
issued
Fee:
$77
Permit Type:
N/A
Building Type:
N/A
Mechanical hvac changeout -commercial
2023-09-18
Replacing the existing 3ton r-22 heat pump package with a new 4ton 410a 14seer2 heat pump package with duct modifications on the roof
Valuation:
N/A
Permit #:
23-01831
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 2.5ton heat pump package unit with new 2.5ton 14seer2 410a heat pump package unit
Valuation:
N/A
Permit #:
24-01940
Status:
issued
Fee:
$77
Permit Type:
N/A
Building Type:
N/A
Relocate back bedroom duct out of water heater closet and install drip leg on gas line for gas furnace
Valuation:
N/A
Permit #:
24-00260
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
4 ton 95% gas furnace and 4 ton 410a high efficiency evaporator coil 3 ton 95% gas furnace and 3 ton high efficiency evaporator coil
Valuation:
N/A
Permit #:
23-00220
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New 4 ton 90k btu gas furnace & 4 ton 410a high efficiency evaporator coil
Valuation:
N/A
Permit #:
23-00261
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 3ton gas system in a closet with a new 3ton gas system in a closet
Valuation:
N/A
Permit #:
24-01548
Status:
issued
Fee:
$77
Permit Type:
N/A
Building Type:
N/A
Replace existing 5ton r-22 heat pump condenser with new 5ton 14seer2 410a condenser
Valuation:
N/A
Permit #:
24-01419
Status:
issued
Fee:
$177
Permit Type:
N/A
Building Type:
N/A
Replace existing 3ton r-22 ac/electric system with new 3ton 14seer2 410a gas system
Valuation:
N/A
Permit #:
24-00967
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New 3 ton 14 seer-2 15 seer 410a gas system
Valuation:
N/A
Permit #:
23-00930
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 4ton r-22 air handler with new 4ton 410a air handler
Valuation:
N/A
Permit #:
24-01457
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
2121 renaissance drivef/res mechanical permit to replace a 3.5 ton gas system (4-ton 80000 btu furnace 4-ton evaporator coil 3.5 ton 14-seer condenser)/randy mrkl in office4 for permit
Valuation:
N/A
Permit #:
19-02072
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 3ton r-22 air handler with new 3ton 410a air handler. (icp equipment)
Valuation:
N/A
Permit #:
23-02605
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 3.5ton gas package unit with new 3.5ton 14seer2 410a gas package unit
Valuation:
N/A
Permit #:
23-02604
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New 3 ton 15 seer 410a gas system
Valuation:
N/A
Permit #:
23-00715
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New 3 ton 410a gas package unit. expired 1-9-23 no inspections
Valuation:
N/A
Permit #:
22-01717
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
1106 w. sears st. residence mechanical. installing 2 units 3 1/2 ton 14 seer gas package unit with new duct work. installing another unit 3 1/2 ton 14 seer gas split system with new duct work. (randy markl in office)
Valuation:
N/A
Permit #:
18-00229
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install 2.5 ton 14 seer 410a gas system (online) expired 4/3/22 no inspection
Valuation:
N/A
Permit #:
21-01852
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
725 w. bullo9ck st/res mechanical permit to addition 3-ton 14-seer gas system with 60, 000 btu furnace/randy markl in office for permit
Valuation:
N/A
Permit #:
19-01617
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace 3 ton gas system with new 3 ton gas system (online)
Valuation:
N/A
Permit #:
21-01215
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Markl & Sons Cooling and Heating License info
Verified License
| License # | TACLA00111584C |
| Status | Active |
| State | Texas |
| Type | Air Conditioning/Refrigeration Contractor |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Markl & Sons Cooling and Heating at the Texas Department of Licensing and Regulation.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | TACLA00017682C |
| Status | Active |
| State | Texas |
| Type | Air Conditioning/Refrigeration Contractor |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Markl & Sons Cooling and Heating at the Texas Department of Licensing and Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | HVAC0540856 |
| Status | Active |
| City | Denison |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of June, 2023. Check the current license status of Markl & Sons Cooling and Heating with the City of Denison
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | HVAC3812766 |
| Status | Active |
| City | Celina |
| Type | Hvac Contractor |
- When BuildZoom last verified this license, it had an expiration date of April, 2022. Check the current license status of Markl & Sons Cooling and Heating with the City of Celina
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | HVAC4093074 |
| Status | Active |
| City | Denison |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of February, 2026. Check the current license status of Markl & Sons Cooling and Heating with the City of Denison
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | HVAC5098441 |
| Status | Active |
| City | Denison |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of May, 2021. Check the current license status of Markl & Sons Cooling and Heating with the City of Denison
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 21-098576 |
| Status | Inactive |
| City | Gainesville |
| Type | Mechanical Contractor |
- According to the City of Gainesville, 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 Markl & Sons Cooling and Heating at the City of Gainesville.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | HVAC9558047 |
| Status | Inactive |
| City | Denison |
| Type | Mechanical Contractor |
- According to the City of Denison, 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 Markl & Sons Cooling and Heating at the City of Denison.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
95
Permits
- Building permit records show that Markl & Sons Cooling and Heating has worked on 95 permitted projects.
Markl & Sons Cooling and Heating Employees
JM
John Markl
Owner
MR
Markl, Donald Randolph
Owner
ML
Markl, John Leonard
Owner