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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Daggett, Pete M | Tea, SD | — | Installer | — |
| Dando, Adam | Rapid City, SD | — | Installer | — |
| Danielson, David | Sioux Falls, SD | — | Installer | — |
| Davis, Jacob | Belle Fourche, SD | — | Installer | — |
| Davis, Phillip | Sturgis, SD | — | Installer | — |
| Davison, Scott W | Hermosa, SD | — | Installer | — |
| Day, Connor | Speardiash, SD | — | Installer | — |
| De Kam, Steven | Rock Valley, SD | — | Installer | — |
| Dealy, Matthew | Hermosa, SD | — | Installer | — |
| Dean, James L | Hill City, SD | — | Installer | — |
| Decker, Eli | Centerville, SD | — | Installer | — |
| Delahoyde, Michael T | Spearfish, SD | — | Installer | — |
| Demasi, Ross | Rapid City, SD | — | Installer | — |
| Denoma, Brandon | Custer, SD | — | Installer | — |
| Dewit, Damon | Sioux Falls, SD | — | Installer | — |
| Dewit, Damon X | Sioux Falls, SD | — | Installer | — |
| Dinger, Zachary | Crooks, SD | — | Installer | — |
| Donaldson, Adam | Oacoma, SD | — | Installer | — |
| Dorale, Delray | Custer, SD | — | Installer | — |
| Drewes, Jesse J | Sioux Falls, SD | — | Installer | — |
| Dubbelde, Nathan | Pipestone, SD | — | Installer | — |
| Duprel, Tom J | Sturgis, SD | — | Installer | — |
| Duwenhoegger, Jason | Piedmont, SD | — | Installer | — |
| Dykstra, Ronald E | Edgemont, SD | — | Installer | — |
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