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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Lance A Sistarejr | Pomfret Center, CT | — | Installer | 5920 |
| Lance D Sigersmith | Old Saybrook, CT | — | Installer | 6065 |
| Lance R Prentiss | Colchester, CT | — | Installer | 4060 |
| Lane Bond | Morris, CT | — | Installer | 6411 |
| Larry Butch | East Hartland, CT | — | Installer | 2990 |
| Larry J Lemek | Tolland, CT | — | Installer | 5058 |
| Larry Kucko | Willington, CT | — | Installer | 3274 |
| Larry T Whalen Jr. | Litchfield, CT | — | Installer | 5428 |
| Larry Torti | Harmony, RI | — | Pumper / Cleaner | 5428 |
| Lawrence Baldyga | Fairfield, CT | — | Pumper / Cleaner | 5558 |
| Lawrence D Carlson | Canaan, CT | — | Installer | 3803 |
| Lawrence Ellis | Oxford, CT | — | Installer | 2797 |
| Lawrence J Corrone | Bethany, CT | — | Installer | 3818 |
| Lawrence J Marcik Jr | Madison, CT | — | Installer | 2878 |
| Lawrence J Merly Jr. | Shelton, CT | — | Installer | 5929 |
| Lawrence P Bonin | Old Saybrook, CT | — | Installer | 6101 |
| Lawrence P Kraiza | West Suffield, CT | — | Installer | 3221 |
| Lawrence Pelletier | East Granby, CT | — | Installer | 2412 |
| Lawrence Tyler Graham | Pawcatuck, CT | — | Installer | 6561 |
| Lee A Stoltz | East Hampton, CT | — | Installer | 877 |
| Lee B Collins | Wales, MA | — | Installer | 6270 |
| Lee Garrison | Chaplin, CT | — | Installer | 5056 |
| Lee L Archer | Westbrook, CT | — | Installer | 5811 |
| Lee Steiner | Bethlehem, CT | — | Installer | 5707 |
| Lee Stoltz Jr | East Hampton, CT | — | Installer | 4085 |
| Lee Valiante | Westbrook, CT | — | Installer | 5669 |
| Lee Valiante | Westbrook, CT | — | Installer | 6345 |
| Leo D Caldarella | Old Saybrook, CT | — | Installer | 985 |
| Leon Smith | Stevenson, CT | — | Installer | 5609 |
| Leonard H Bull Iii | West Suffield, CT | — | Installer | 5540 |
| Leslie R Massey | Warren, CT | — | Installer | 3326 |
| Lester J Daddario | West Suffield, CT | — | Installer | 5758 |
| Linden Oleary | Thompson, CT | — | Installer | 3806 |
| Lisa A Lowden | Ridgefield, CT | — | Installer | 5411 |
| Lloyd A Burritt | Redding, CT | — | Installer | 6142 |
| Lloyd W Tice | Shelton, CT | — | Installer | 2919 |
| Lon Pelton | Windsor, CT | — | Installer | 846 |
| Louis A Ethier | East Hartford, CT | — | Installer | 6303 |
| Louis C Bianco | Sandy Hook, CT | — | Installer | 5313 |
| Louis J Campanaro | Clinton, CT | — | Installer | 258 |
| Louis J Soja Jr | Plainfield, CT | — | Installer | 3668 |
| Louis M Gherlone | Orange, CT | — | Installer | 3216 |
| Louise M Houk | Litchfield, CT | — | Installer | 3097 |
| Lucas W Hoar | Ashford, CT | — | Installer | 5415 |
| Lucien A Dimeo Jr. | Derby, CT | — | Installer | 5759 |
| Lucilio P Desousa | Danbury, CT | — | Installer | 6460 |
| Luigi Lanni | New Canaan, CT | — | Installer | 2950 |
| Luis Alberto Galicia | Stamford, CT | — | Installer | 6486 |
| Luis R Barrios | Derby, CT | — | Pumper / Cleaner | 5243 |
| Luis Velez | North Haven, CT | — | Pumper / Cleaner | 5144 |
| Lukas P Oczkowski | Seymour, CT | — | Installer | 6217 |
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