Serving Newmarket and the surrounding areas, S. R. Gillis & Sons Ltd. is a locally owned and operated heating and air conditioning business. We offer after-hour emergency service and free quotes on new equipment. At S. R. Gillis & Sons Ltd. Heating and Air Conditioning, we are proud of the reputation we’ve built in the community. From the office staff to our licensed technicians, we provide excellence in service and installations. If you are looking to replace your existing equipment, need service on any make and model or just want advice, please give us a call or stop by our office ; our friendly office staff would gladly answer any of your questions.