Emerging as one of Connecticut’s largest major mechanical contracting companies, Main Enterprises, Inc is a fully equipped he ... ating, ventilation, and air conditioning company headquartered in Stratford, Connecticut. Main Enterprises applies new technologies and has done so for 100 years. The benefits of partnering with Main Enterprises include our ability to offer and directly control a myriad of in-house services such as a 24-hour service department, a sheet metal and mechanical pipe fabrication facility, our design/build engineering staff and an expert installation group. These services are supported by expert back-office management staff who coordinate and provide world-class customer service and quality in their work. read more