Best Licensed HVAC Contractors in Norwalk, CT
12 HVAC contractors registered in Norwalk hold current DCP licenses, verified against official records as of August 20, 2026. The 8 below are the top-ranked, ordered by years licensed.
- 54 current DCP heating, piping and cooling contractor licenses held in Norwalk
- 12 trade-name companies in Norwalk are backed by those personal licenses
- Scope tiers among Norwalk's licenses: 22 unlimited, 32 limited
- Median time licensed in Norwalk: 23 years
- Longest-standing license behind a Norwalk trade-name company: issued in 1988
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- Verified
- August 20, 2026
- Licensed since
- 1988
- Held by
- KEITH J STADLER
- Scope
- Limited
- Verified
- August 20, 2026
- Licensed since
- 1989
- Held by
- BRIAN J KARWOSKY
- Scope
- Unlimited
- Verified
- August 20, 2026
- Licensed since
- 1998
- Held by
- SCOTT C HARRISON
- Scope
- Unlimited
- Verified
- August 20, 2026
- Licensed since
- 1999
- Held by
- JEFFREY P YANCE
- Scope
- Unlimited
- Verified
- August 20, 2026
- Licensed since
- 1999
- Held by
- LEONARD J DENNER
- Scope
- Limited
- Verified
- August 20, 2026
- Licensed since
- 1999
- Held by
- THOMAS K O'BRIEN
- Scope
- Limited
- Verified
- August 20, 2026
- Licensed since
- 2003
- Held by
- ROCKY A DELFINO
- Scope
- Limited
- Verified
- August 20, 2026
- Licensed since
- 2008
- Held by
- JAMES R MARASCO
- Scope
- Unlimited
Compare the top 6 at a glance
| Company | License | Scope | Licensed since |
|---|---|---|---|
| K Stadler And Sons | #HTG.0308500-S3 | Limited | 1988 |
| Brian Karwosky's A/c & Heating Co Inc. | #HTG.0303387-S1 | Unlimited | 1989 |
| Turner & Harrison Inc. | #HTG.0388984-S1 | Unlimited | 1998 |
| Yance Heating & Air Conditioning | #HTG.0389858-S1 | Unlimited | 1999 |
| L J Denner & Sons Inc. | #HTG.0306169-D1 | Limited | 1999 |
| Thomas K Obrien Plumbng & Htng Inc. | #HTG.0307291-S7 | Limited | 1999 |
Norwalk HVAC licensure at a glance
Connecticut licenses people, not companies, so this page counts both and says which is which: 54 current DCP heating, piping and cooling contractor licenses are held in Norwalk, and 12 trade-name companies are backed by those license holders. A business appears here only when licensed contractors operate under a registered trade name, and each listing names the person whose license backs it. The state also defines a scope on every credential: 22 of Norwalk's licenses are unlimited and 32 limited - shown as published, never ranked on, because scope authorises kinds of work rather than ordering quality. Tenure is what these pages rank on: the median Norwalk license has been held 23 years, and the longest-standing license behind a trade-name company was issued in 1988. Licenses here expire on one statewide date per trade each year, so an expiration date says nothing about an individual company and none is shown per listing - it gates currency only. DCP publishes no insurance, no bond and no phone for any licensee, so Connecticut listings show none of the three. eLicense cannot link straight to a record, so every listing above shows its number for you to paste into DCP's eLicense lookup. How we verify.
HVAC Contractors in Norwalk: common questions
How many licensed HVAC contractors are there in Norwalk?
54 current DCP heating, piping and cooling contractor licenses are held in Norwalk, backing 12 trade-name companies. 12 Norwalk-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses in DCP's four live statuses, unexpired at our data date, count.
Who holds a Connecticut HVAC license - the company or a person?
A person. Connecticut licenses people, not companies: a business appears here only when licensed contractors operate under a registered trade name, and each listing names the person whose license backs it. 22 of Norwalk's 54 licenses are unlimited scope and 32 limited - shown as published, never ranked on.
How do I check an HVAC contractor's license in Connecticut?
Every listing above shows the license number and names its holder. DCP's eLicense lookup cannot link straight to a record, so open it and type the number in. The median Norwalk license has been held 23 years, and the longest-standing license behind a trade-name company was issued in 1988.