Commerical Boilers, Industrial Boilers, Gas Boilers, Fuel Conversions, Gas Piping, Commercial Heating Contractor, Industrial Heating Contractor Since 1985, Combustion Mechanical Services, Inc. has specialized in commercial and residential HVAC services for the Hartford county, Connecticut area. Residential & Commercial Ultra High Efficiency Boilers Oil to Natural Gas Conversions Air Conditioning Boiler Design & Installation And much, much more We are a BBB accredited local business. Utilizing natural gas offers a more environmentally friendly alternative to traditional oil. Additionally, it can save you money. Let us design a new high efficiency boiler system that utilizes natural gas for your home or business. Converting from an oil boiler system to a natural gas system is not only good for the environment & your budget. We safely convert your current fuel system. Our experience covers oil Boilers, gas boilers and also electric boiler systems.