We purchased a complete Carrier furnace and air conditioning unit for our 45-year old house. McMaster took care of the necessary permits and installed a slim line air conditioning condenser that met the City's strict code requirements. The installation crew was very professional and worked in a well organized fashion to remove the old furnace and install the new equipment. We have had no problems at all with either the furnace or the air conditioner in the first six months of use. McMaster got the job done right the first time.