| CMColorado Mechanical Systems INC | Longmont | CO | — | ◇ UNVERIFIED |
| CICommodore Industries | Jackson | TN | — | ◇ UNVERIFIED |
| CHCommonwealth Heating & Cooling | Virginia Beach | VA | — | ◇ UNVERIFIED |
| CMComponents Manufacturing CO | Trenton | SC | — | ◇ UNVERIFIED |
| CICompressor Industries LLC | Melvindale | MI | — | ◇ UNVERIFIED |
| CUCompressors Unlimited International LLC | Dallas | TX | — | ◇ UNVERIFIED |
| CICompu-aire INC | Whittier | CA | — | ◇ UNVERIFIED |
| CCompu-metal,inc | Ontario | CA | — | ◇ UNVERIFIED |
| COCondair Operations LLC | Richmond | VA | — | ◇ UNVERIFIED |
Confab Manufacturing Company LLC | Sun Valley | CA | — | ◇ UNVERIFIED |
| CBConserv Building Services of North Carolina, LLC | Morrisville | NC | — | ◇ UNVERIFIED |
| CCConsol Controls CORP Plt No 4 | El Segundo | CA | — | ◇ UNVERIFIED |
| CFConsolidated Fabricators CORP | Galt | CA | — | ◇ UNVERIFIED |
| CMContract Metal Products INC | Tracy | CA | — | ◇ UNVERIFIED |
| CBCook Brothers Heating & Cooling LLC | Wichita | KS | — | ◇ UNVERIFIED |
| CTCooling Tower Depot, INC. | Bedford Park | IL | — | ◇ UNVERIFIED |
| CTCooling Towers Systems, INC | Macon | GA | — | ◇ UNVERIFIED |
| CACOOLLINE America Inc. | Alpharetta | GA | — | ◇ UNVERIFIED |
| CACOOLLINE America Inc. | Alpharetta | GA | — | ◇ UNVERIFIED |
| CCCopeland CORP | Shelby | NC | — | ◇ UNVERIFIED |
| CICornelius, INC. | Glendale Heights | IL | — | ◇ UNVERIFIED |
| CLCorral-130 LLC | Compton | CA | — | ◇ UNVERIFIED |
Cospolich, INC. | Norco | LA | — | ◇ UNVERIFIED |
| CFCrown Fixtures INC Dba Crowntonka Walk Ins | Winnebago | MN | — | ◇ UNVERIFIED |
| CACrystal Air & Water, INC. | Gainesville | FL | — | ◇ UNVERIFIED |
| CCCrystal Comfort INC. | New York | NY | — | ◇ UNVERIFIED |
| CLCsafe, LLC | Moraine | OH | — | ◇ UNVERIFIED |
| CSCullum Services INC | Lexington | SC | — | ◇ UNVERIFIED |
| CCCustom Cooler INC | Elkton | KY | — | ◇ UNVERIFIED |
| DADaikin Applied America, INC. (formally Mcquay International) | Scottsboro | AL | — | ◇ UNVERIFIED |
Daikin Applied Americas INC | Faribault | MN | — | ◇ UNVERIFIED |
Daikin Applied Americas INC | Faribault | MN | — | ◇ UNVERIFIED |
| DADaikin Applied - Owatonna East | Owatonna | MN | — | ◇ UNVERIFIED |
| DODaikin Office Upgrade | Verona | VA | — | ◇ UNVERIFIED |
| DCDalou CORP Dba Tomco Products | Azusa | CA | — | ◇ UNVERIFIED |
| DSDanfoss Scroll Technologies | Arkadelphia | AR | — | ◇ UNVERIFIED |
| DTDanfoss Turbocor Compressors - Building E | Tallahassee | FL | — | ◇ UNVERIFIED |
| DAData Aire INC | Orange | CA | — | ◇ UNVERIFIED |
| DCData Cooling Technologies (1667080058) | Streetsboro | OH | — | ◇ UNVERIFIED |
| DIDayco Inc/pottstown Boro | Pottstown | PA | — | ◇ UNVERIFIED |
| DUDbk USA INC | Spartanburg | SC | — | ◇ UNVERIFIED |
| DPD&b Precision Sheetmetal | Oakdale | CA | — | ◇ UNVERIFIED |
| DEDCG Enterprises LLC | Tampa | FL | — | ◇ UNVERIFIED |
| DHDelphi Harrison Thermal Systems | Dayton | OH | — | ◇ UNVERIFIED |
| DFDelta Folding Gates INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| DFDer Floradale LLC | South El Monte | CA | — | ◇ UNVERIFIED |
| DIDickson Industrial Park, INC. | Newark | OH | — | ◇ UNVERIFIED |
| DMDiscover Metal Spinning | Wilmington | CA | — | ◇ UNVERIFIED |
| DIDixie-narco INC | Ranson | WV | — | ◇ UNVERIFIED |
| DWD.j. Wagner Heating & Air Conditioning INC | Westville | NJ | — | ◇ UNVERIFIED |