An air based central heating system is composed of a centrally placed furnace to heat the air, a duct system to disperse the heated air throughout the home and a thermostat to determine the desired temperature. Hot air heating systems use a furnace, usually placed in the cellar or garage. The furnace can be oil or gas powered or in occasional instances hybrid.
Because warm air rises, furnaces are most frequently put in the lower floor of the dwelling. All furnaces have four major functions. 1) When the dwelling's thermostat gets a room temperature reading below the pre-set level it causes ignition of the flame in the furnace. 2) The hot gases generated from the combustion pass through the furnace's heat exchangers. 3) The furnace blower sucks in cool air from the living space and makes it pass over the surface of the heat exchanger. The resultant heated|warmed} air is recycled back into the various rooms of the dwelling. 4) Furnaces are built with a flue which serves as a outflow tract for gaseous vapors.
The heated air travels to the rest of the house in a system of metal air ducts. There are two types of duct systems gravity and forced air. The gravity system utilizes the fact that warm air rises and cold air sinks. The furnace is placed in the lowest part of the home and each chamber contains an intake and out flow duct. Hot air travels up through the system and enters each room of the abode. A while later cold air flows out of each room through the outflow duct and travels back down to the furnace where it will be reheated. In the forced air system, on the other hand, a blower forcibly distributes the heated air throughout the house.
Central heating and air conditioning systems will almost always share the identical system of ducts and the identical thermostat. Modern systems have the ability to adjust the humidity in the home and purify the air through an ionic process as it flows through the duct system.
Once a year homeowners need to arrange for maintenance for their furnace. At that time the trained HVAC technician will clean your furnace and conduct tests for your furnace, thermostat, ignition system, safety controls, as well as checking for leaks and means for inefficiency, as well as various other things we look for and inspect. This annual maintenance will insure that your heating system runs at peak efficiency throughout the cold months, and awill minimize the liklihood of a heating system breakdown in the midst of winter.
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