Key Heating & Air Conditioning is a full service HVAC Service & Installation Company - For over 30 years we have served the residents of the NH Seacoast, North Shore of MA, Maine Seacoast, and now, the Lakes Region. We are a family owned and operated company that specializes in all the latest technology including geothermal and ductless heat pump systems. We are a design build company and can help you with all your HVAC needs. We provide a comprehensive service membership program and 24/7 emergency service. Our sales department is available for FREE in home estimates and energy assessments. We have an in house training facility and all installation & service technicians are factory trained and have over 200 years of combined experience.