All furnaces need regular professional maintenance service. A gas furnace should be serviced and professionally tested for carbon monoxide every 1 to 2 years. It is very rare for a gas furnace to produce enough CO to satisfy the needs of Dr. Kevorkian. However, low levels of CO can have a very serious health effects and the possibility of CO as a cause of the problem is often overlooked. Even very low CO levels, under 20 PPM, can result in lower cognitive ability.
Oil furnaces require annual maintenance.
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