Mechanical Resource Group is an HVAC, hydronics, sales, and service organization serving Middle Tennessee. We combine resourc ... es of the most experienced HVAC and hydronics engineers and the top manufacturers with a mission of service. Our Service division provides prompt, dependable service for all your facility's HVAC needs. We are the Hydronics Source for Middle Tennessee. Our Aftermarket Parts department specializes in the replacement of worn and damaged parts and the replacement of an existing unit, regardless of the original manufacturer. - Cooling Tower Parts and Replacement Units: Evapco, Marley, BAC - WSHPs - VFDs - VRV and Mini Splits - Light Commercial Units - Pumps: Taco - Boilers: RBI, Smith and Hydrotherm read more