At Jeff Mackay Mechanical, we are a full-service HVAC contractor in Littleton, New Hampshire specializing in boiler troubleshooting, installation, and repair services for residential and commercial customers. We also provide quality heating and cooling services as well as propane and oil equipment, air duct cleaning, and dryer vent cleaning. Our knowledgeable technicians sell high-quality, brand name equipment and are happy to recommend a system appropriate for your application.