At Charter Oak Mechanical we stress the importance of furnace maintenance to our customers. Here in southern New England we rely on our furnaces three seasons of the year. Whether you have an oil or gas burning furnace, combustion products can accumulate and cause serious health hazards in your home. One of the major hazards of neglecting furnace maintenance is the danger of carbon monoxide poisoning. Dirty furnaces may produce deadly amounts of this odorless gas. A costly consequence of a dirty