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| Alliant Mechanical Services | 1315 W Columbia Evansville, IN 47710 | 812-453-5210 | |
| Alpha Mechanical Service, Inc. | 7200 Distribution Drive Louisville,, KY 40258 | 502-968-0121 | |
 | | 1401 Buchanan Road Evansville, IN 47720 | 812-425-9389 | |
| B & S Plumbing & Heating, Inc. | 889 W. Johnson Avenue Terre Haute, IN 47802 | 812-234-1152 | |
 | | 7944 Bell Oaks Drive Newburgh, IN 47630-2547 | 812-853-2305 | |
| Baylor Heating and Air, Inc. | 1016N Main Street Evansville, IN 47711 | 812-425-8435 | |
| BMWC | 1740 W Michigan St Indianapolis, IN 46222 | 317-267-0273 | |
| Bowen Engineering Corp. | P. O. Box 40729 Indianapolis, IN 46240 | 317-842-2616 | |
| Bryant Construction Company, Inc. | 370 Bryant Road Harrisburg, IL 62946 | 618-994-2990 | |
 | | 1230 E Michigan Street Evansville, IN 47711 | 812-423-5851 | Serving Evansville and surrouding areas since 1920. Free estimate during regular business hours. M-F 7-4 |
| Cain Construction Co, LLC | 1910 Middle Leesville Rd Bedford, IN 47421 | 812-583-9529 | |
| Circle R Mech. Contr., Inc. | 4011 N 150 W Columbus, IN 47201-9576 | 812-375-1543 | |
| Collazo Plumbing | 505 Radio Ave Evansville, IN 47725 | 812-430-0819 | |
| Corressell, Inc. | 3810 St. Phillip S. Mt. Vernon, IN 47620 | 812-426-1440 | |
| Custom Mechanical Construction | 1609 Allens Lane Evansville, IN 47710 | 812-437-8848 | |
| DeBra - Kuempel | 3976 Southern Avenue Cincinnati, OH 45227 | 513-271-6500 | |
| Deig Brothers | P. O. Box 6429 Evansville, IN 47719-0429 | 812-423-4201 | |
| Dunlap & Co., Inc. | P. O. Box 328 Columbus, IN 47202-0328 | 812-376-3021 | |
| Elite Plumbing & Maintenance | 6013 W Merryway Lane Bloomington, IN 47404 | 812-319-7864 | |
| Enerfab Inc. | 4955 Spring Grove Ave Cincinnati, OH 45232 | 513-482-7600 | |
| Freitag Weinhardt, Inc. | 5900 N. 13th , P. O. Box 5177 Terre Haute, IN 47805 | 812-466-9861 | |
 | | 2512 N Cullen Ave., Suite C Evansville, IN 47715 | 812-471-3788 | |
| GMRR Services LLC | 2501 S Kentucky Ave Evansville, IN 47714 | | |
| Greiner Bros., Inc. | 6161 English Avenue Indianapolis, IN 46219 | 317-356-0926 | |
| H. G. Heinz, Inc. | 221 Manilla St., P. O. Box 123 Vincennes, IN 47591 | 812-887-7908 | |
| Haase Mechanical Contractors, Inc. | 441 Hoffman Drive Henderson, KY 42420 | | |
| Hampton Refrigeration | 2711 N. Cullen Avenue Evansville, IN 47715 | 812-471-9940 | |
 | | P. O. Box 1998 Bloomington, IN 47402 | 812-339-2579 | |
| Heavrin Plumbing, LLC | 150 Krietenstein Rd S Wadesville, IN 47638 | | |
| Heflin Industries, Inc. | 5267 W. Airport Road Ste E Bloomington, IN 47403 | 812-825-1600 | |
| Henson Robinson Company | PO Box 13137 Springfield, IL 62791 | 217-544-8451 | |
 | | 424 W. Tennessee St. Evansville, IN 47710 | 812-425-9131 | |
| JZ Plumbing | 7300 Schultz Rd Elberfeld, IN 47613 | 812-589-6312 | |
| Kennedy Tank & Mfg. Co., Inc. | 833 E. Sumner Avenue PO Box 47070 Indianapolis, IN 46227 | 317-787-1311 | |
| Maddox Industrial Contracting | PO Box 44 Santa Claus, IN 47579 | 812-544-2156 | |
| Mastercraft Mechanical Contractors, Inc. | 13980 E Capt WJ Nelson Dr Ste C-1 Odon, IN 47562 | 812-863-9080 | |
| McIntyre Brothers, Inc. | P. O. Box 67 Bedford, IN 47421 | 812-275-5956 | |
| Mech-Tech, Inc. | 5267 B West Airport Rd. Bloomington, IN 47403 | 812-825-2964 | |
| Mel-Kay Electric Co., Inc. | 1511 N. Garvin St Evansville, IN 47711 | 812-423-1128 | |
 | | 402 3rd Avenue Jasper, IN 47546 | 812-482-6766 | |
| Midwest Mechanical Services, Inc. | 2161 Commercial Ct. Evansville, IN 47720 | 812-421-3838 | |
| Morrow Mechanical Services | PO Box 6514 Evansville, IN 47719 | 812-305-2152 | |
| Nading Mechanical, Inc. | P. O. Box 98 Hope, IN 47246 | 812-546-6111 | |
| P. C. R. Plumbing, Inc. | 600 Ingle Street Evansville, IN 47708 | 812-425-3350 | |
| Ritzert Co., Inc. | 3117 Kratzville Rd. Evansville, IN 47710 | 812-426-1124 | |
| Schmitt Refrigeration | 200 S. Governor Evansville, IN 47713 | 812-424-5878 | |
| Sims Electrical | PO Box 4037 Evansville, IN 47724 | 812-647-9990 | |
| Spartan Mechanical, LLC | 601 Lincoln Ave Bedford, IN 47421 | 812-583-5522 | |
| SR Mechanical, LLC | 6302 St Rd 60E Orleans, IN 47452 | 812-583-0999 | |
| Sterling Industrial, LLC | 401 NW First Street Evansville, IN 47708 | 812-492-7117 | |
| Sycamore Engineering, Inc. | 1010 Chestnut Street Terre Haute, IN 47803 | | |
| The State Group | 13800 N. Hwy 57 Evansville, IN 47725 | 812-868-5836 | |
| Walker Plumbing LLC | 1615 e Tierney Street Bloomington, IN 47401 | 812-360-4267 | |
| Walsh Industrial Piping | PO Box 11400 Lexington, KY 40511 | 859-200-6543 | |
 | | 2051 W. Industrial Park Drive Bloomington, IN 47401 | 812-339-4669 | |