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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| H Thomas Walker Jr | Ellington, CT | — | Installer | 2247 |
| Harold L Burr | Waterford, CT | — | Installer | 2187 |
| Harold P Garvin Iii | Old Lyme, CT | — | Installer | 2578 |
| Harold Pierce Jr | Granby, CT | — | Installer | 3048 |
| Harold T James Jr | South Glastonbury, CT | — | Installer | 5477 |
| Harry C Briggs Jr | Windsor Locks, CT | — | Installer | 3845 |
| Harry H Wyant | Washington, CT | — | Installer | 3709 |
| Henry Becker | Willington, CT | — | Installer | 3482 |
| Henry Halverson | Stratford, CT | — | Installer | 3369 |
| Henry J Marchell | Winsted, CT | — | Pumper / Cleaner | 5249 |
| Henry J Marchell | Winsted, CT | — | Installer | 6024 |
| Henry W Vasel | Rocky Hill, CT | — | Installer | 5509 |
| Homer R Underwood Jr | Marble Dale, CT | — | Installer | 363 |
| Horace Lindo | Oakdale, CT | — | Installer | 1435 |
| Howard E Slater | South Windsor, CT | — | Installer | 5633 |
| Howard Hathaway | Haddam, CT | — | Installer | 3780 |
| Howard L Lethbridge | Warren, CT | — | Installer | 5135 |
| Howard O Slater | South Windsor, CT | — | Installer | 1098 |
| Hugh Caldwell | East Granby, CT | — | Installer | 2991 |
| Humberto Ulyssys Teixeira | East Hartford, CT | — | Installer | 6423 |
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