J S Harlow Heating & Cooling is an HVAC Service in Westford, MA offering installation, repair, and maintenance for heating and air conditioning services. Your heating and air conditioning system is one of the most expensive appliances you have in your home. Proper maintenance helps keep your system running efficiently, prolong the life of your system, lower your utility bill, and save you from unwanted repairs. Our service experts will provide simple repair on your heater / furnace or Air Conditioning, to a full equipment installation. Specializing in Air Duct Cleaning, Dryer Vent Cleaning, Hood Cleaning, or any heating, ventilation, and air conditioning repair, maintenance, or installations. Providing a service team that are experienced and trained in using state-of-the-art technology to diagnose, repair existing systems.