Updated: Jun 10, 2026
Location and Projects
Address
30 VALLEY FORGE CT, Southington, CT, 06489
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Thomas J Diaz HVAC/Mechanical Contractor
Thomas J Diaz, 30 Valley Forge Ct, Southington, CT (Employee: Thomas Diaz) holds a Heating, Piping & Cooling Limited Contractor license according to the Connecticut license board.
Their BuildZoom score of 91 ranks in the top 37% of 12,093 Connecticut licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Thomas J Diaz, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Thomas J Diaz Contact Information
Address: 30 VALLEY FORGE CT, Southington, CT 06489
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Thomas J Diaz Southington
Quality
91
63rd percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Thomas J Diaz has a BuildZoom score of 91, which places them above 63% of 12,093 contractors in Connecticut.
Activity
|
1 project
|
2025 |
Our building permit records indicate that Thomas J Diaz has worked on at least
1.0 project over the past year.
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.
Pricing
|
1 project
|
$5k-$20k |
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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Oil to natural gas conversion installation of a new heil 96% efficient warm air furnace and necessary ductwork transitions installation of a new heil air conditioner and evaporator coil installation of a new natural gas line from the new meter bar to the new furnace. load cals provided. must meet 2018 state building code along with amendments
Valuation:
$7,675
Permit #:
M-19-63
Status:
issued
Fee:
$246
Permit Type:
HVAC
Building Type:
Residential improved
Installation of a spirit lowboy oil fired furnace & heil 3.5 ton 13 seer air conditioning system new duck work. load cals provided. duct blast test required. must meet 2016 state building code along with amendments must have licensed burner tech set-up burner. piror to final inspection
Valuation:
$11,475
Permit #:
M-18-112
Status:
complete
Fee:
$179
Permit Type:
HVAC
Building Type:
Residential improved
Installation of heating zone of baseboard from the existing heating system for the lower level area that is being finished currently
Valuation:
$3,725
Permit #:
M-20-131
Status:
final
Fee:
$57
Permit Type:
HVAC/mechanical
Building Type:
N/A
Oil to natural gas conversion with the installation of a heil high efficiency warm air furnace and new piping per code
Valuation:
$5,100
Permit #:
M-19-518
Status:
issued
Fee:
$127
Permit Type:
Heating
Building Type:
Residential improved
Installation of heil natural gas high efficency warm air furnace new gas piping & replace some ducting in the basement
Valuation:
$5,425
Permit #:
M-19-408
Status:
issued
Fee:
$126
Permit Type:
Gas burner/gas bo...
Building Type:
Residential improved
Oil to natural gas conversion installation of a heil 96% direct vent gas furnace + central air conditioning replacement system navien npe-210 tankless water heater new gas piping for new equipment. any new condensers will be placed where the exisitng condensers are now
Valuation:
$11,465
Permit #:
M-20-87
Status:
issued
Fee:
$195
Permit Type:
HVAC
Building Type:
Residential improved
Oil to natural gas conversion will remove existing oil fired boiler. replace with baxi luna duo-tec high efficiency combination tankless boiler and hot water heater. the unit is direct vent to the outdoors will install a natural gas line for the new boiler to the service that is to be installed by cng
Valuation:
$6,250
Permit #:
M-16-177
Status:
issued
Fee:
$127
Permit Type:
Boiler/furnace re...
Building Type:
Single family
Installation of a replacement gas furnace & air conditioning installation of a new gas line to the barn for a water heater & stove. must meet 2009 irc iecc along with ct amendements. state codes. ( side arm stove not appoved for install)
Valuation:
$6,300
Permit #:
M-16-298
Status:
issued
Fee:
$110
Permit Type:
Gas piping
Building Type:
Residential improved
Oil to gas conversion replace boiler with a navien ncb 210 new natural gas piping to the meter bar to be installed. heatloss provided. must meet 2012 irc iecc along with amendments
Valuation:
$6,475
Permit #:
M-17-14
Status:
issued
Fee:
$109
Permit Type:
HVAC
Building Type:
Residential improved
Installation of central air conditioning system in attic. ameristar 13 seer 2.5 ton r410a with indoor air handler. must meet 2012 irc iecc along with amendments. load calulations provided
Valuation:
$7,001
Permit #:
M-17-94
Status:
issued
Fee:
$123
Permit Type:
HVAC
Building Type:
Residential improved
Installation of new natural gas heating & air conditioning system in attic new gas line. heatloss provided. must meet 2009 irc iecc with ct amendments. csst bonding required
Valuation:
$6,750
Permit #:
M-16-132
Status:
complete
Fee:
$110
Permit Type:
HVAC
Building Type:
Residential improved
Installation of new natural gas warmair heating system with air conditioning new gas line. heatloss provided. must meet 2009 irc iecc with ct amendments. csst bonding reuired
Valuation:
$8,785
Permit #:
M-16-131
Status:
issued
Fee:
$138
Permit Type:
HVAC
Building Type:
Residential improved
New construction home** installation of new heating & air conditioning system navien combination lp with hydro air handler 2 zones new duct system. as per code
Valuation:
$8,800
Permit #:
M-15-162
Status:
issued
Fee:
$138
Permit Type:
HVAC
Building Type:
Commercial
Oil to gas conversion, installation of a heil 96% lp gas furnace, direct vent and a heil 3 ton 16 seer system
Valuation:
$8,200
Permit #:
M-18-318
Status:
issued
Fee:
$123
Permit Type:
Gas Burner/Gas Bo...
Building Type:
Residential Improved
Installation of 50 gallon electric hot water heater. must meet 2012 irc iecc along with ct amendments
Valuation:
$450
Permit #:
M-16-334
Status:
complete
Fee:
$26
Permit Type:
Water heater
Building Type:
Residential improved
2nd fl** install gas fired furnace in attic replace existing gas supply from meter to attic also supply to stove. pressure test and inspect gas piping and equipment for safe operation as per code
Valuation:
$3,600
Permit #:
M-13-00906
Status:
issued
Fee:
N/A
Permit Type:
Mechanical pmt un...
Building Type:
N/A
Installation of lg ductless heat pump system with 2 indoor and 1 outdoor condensor
Valuation:
$5,800
Permit #:
M-19-236
Status:
complete
Fee:
$125
Permit Type:
Heat pumps
Building Type:
Residential improved
Oil to gas converstion. new gas line along with new navien ncb240 combination boiler. heat loss provided
Valuation:
$6,100
Permit #:
M-15-392
Status:
issued
Fee:
$110
Permit Type:
HVAC
Building Type:
Residential improved
Install navien ncb-210 lp boiler with new lp (propane) gas lines to be connected to 2- 100 gallon tanks supplied by others, as per code.
Valuation:
$3,600
Permit #:
M-14-20
Status:
issued
Fee:
$67
Permit Type:
Gas Burner/Gas Bo...
Building Type:
Single Family
Oil to gas conversion. install new gas fired furnace and gas piping. pressure test and inspect gas piping and furnace for safe operation as per code
Valuation:
$5,150
Permit #:
M-13-02465
Status:
issued
Fee:
N/A
Permit Type:
Mechanical pmt un...
Building Type:
N/A
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Thomas J Diaz Reviews
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Verified License
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Thomas J Diaz License info
Verified License
| License # | HTG.0401882-D1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Limited Contractor |
| Date Issued | 09-01-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Thomas J Diaz at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
91
BuildZoom Score
75
Permits
- Building permit records show that Thomas J Diaz has worked on 75 permitted projects.
Thomas J Diaz Employees
TD
Thomas Diaz