Keep cool in the summer and warm in the winter with our premiere HVAC services. At AT Mechanical LLC, we specialize in heating and air conditioning service for both residential and commericial systems. Our highly-qualified technicians have over 30 years of HVAC experience in the following: Installation and repairing of residential and commercial heating and air conditioning units, Custom duct work, Servicing and maintaining all brands of equipment, Installing geothermal heat pumps, Our fast, courteous service and unparalleled expertise have made us the favorite heating and cooling company serving all of CT. Your comfort is our goal, and we'll work until your are satisfied with the heating and air conditioning service provided. We also provide emergency service 24 hours a day, 7 days a week.