For all of your home comfort needs, trust the experts at Cullen Heating & Air Conditioning Serving All of Durham Region for over 30 Years. Nominated #1 Heating & Air Conditioning Contractors. We offer customers a range of home comfort appliances including air cleaning systems, ductless air conditioning systems, Central Air Conditioning, furnaces, gas fireplaces, humidifiers and more. All installations of Furnaces and Air Conditioners come with a 10-year warranty on parts and 5 Year labour. FREE in home Estimates. Call Us today to book an appointment.