Subzero Heating & Air Conditioning offers comprehensive Concord HVAC services you can trust. Subzero Mechanical is a family owned company and has been in business since 2015. We have become specialists in servicing, repair, installing, and maintenance of HVAC units, furnaces, and air conditioning systems. We are your trusted, reliable HVAC contractor and we are also a Carrier Authorized dealer and a Trane Authorized dealer.