Connect with Top-Rated HVAC Contractors in Saint James!

At DML & S Air Conditioning & Heating, we're here to help you create and maintain a healthy indoor climate in your home or commercial property. As a full-service HVAC contractor, we provide both residential and commercial heating, cooling and indoor air quality products and services. Our family owned business has been serving Long Island, including Head of the Harbor, Smithtown, Miller Place and Mount Sinai NY, for over 30 years and we are proud of our reputation for professional, courteous and attentive service.