the environmental protection agency, which is usually very slow and reluctant to recommend any services, except the ones which have been proven to be viable and beneficial, recommends inspecting and servicing fuel-burning heating system before each furnace season (www.environmental protection agency.gov) to be sure that you are protected from carbon monoxide (co) poisoning. carbon monoxide can enter your house or facility any [...] . . . → Read More: hvac tune-ups can save lives| sauk village, matteson, oak lawn