Total Mechanical Systems, LLC., has been serving Connecticut with heating and cooling service, maintenance, and installation since 2001. They're the Ductless Dealer in Connecticut and a foremost installer of ductless air conditioning and heating mini-split systems.

Tower Equipment Company is a distributor of Residential and Commercial Heating, Ventilation and Air Conditioning Controls (HVAC) and supplies in the state of Connecticut.

TRUMPF INC. is a company based in Connecticut that provides manufacturing solutions in the fields of machine tools, laser technology, and electronics.

United Technologies Corporation provides technology products and services to building systems and aerospace industries worldwide. The company's UTC Climate, Controls & Security segment offers electronic security products, including intruder alarms, access control systems, and video surveillance systems; and fire safety products, as well as systems integration, video surveillance, installation, maintenance, and inspection services.

Veto Pro Pac tool bags are designed for technicians and tradesmen who consider themselves professionals, take pride in their work, and appreciate high-quality tools and tools bags that can stand up to the rigors of their daily work. Veto Pro Pac offers tool bags and tool storage solutions for all trades, including HVAC/R technicians, electricians, plumbers, A/V and security technicians, MRI technicians, carpenters, and marine technicians

Xtralis provides advanced fire detection for refrigerated storage. Xtralis is the global provider of powerful solutions for the very early & reliable detection of smoke, fire, and gas threats. They protect highly-valued and irreplaceable assets and infrastructure belonging to the world’s top governments and businesses.