| Business | Phone |
| Millennium Technology Of Iowa 1454 30th St 207, West Des Moines 50266 | (515) 223-6048 |
| Capitol R & D Inc 917 9th St, West Des Moines 50265 | (515) 273-5170 |
| Hart-Hammer Inc 529 Elm St, West Des Moines 50265 | (515) 277-6305 |
| Hvac Resources Inc 2910 Westown Pkwy 110, West Des Moines 50266 | (515) 223-9449 |
| Manufacturers' Representatives 705 Knolls Ct, West Des Moines 50265 | (515) 274-4166 |