How Home Air gets Cleaned, Heated and Cooled
Your home’s air is pulled through a return duct and into the furnace. Air first passes through your furnaces air filtration system (which include either replacement filters that should be replaced on a regular basis, or a permanent filter system such as electrostatic filters, that should be taken out and cleaned on a regular basis).
When the furnace is heating, the air is circulated through the heat exchanger where it is heated to the temperature set at the thermostat. The blower then pushes the heated air into the duct system, where it blows out of the vents and circulates throughout the home, making it warmer.
If you have air conditioning, when cooling, the air pulled from the return ducting, is cooled by the condensing unit which is usually located outside the home. The cooling unit uses refrigerant to remove heat from the air. The blower in the furnace then blows out the cooled air into the duct system to cool down the house.
AIRFLOW: Because of its nature and makeup, air under pressure will go wherever it can. Also, like water pressure, air pressure can be either positive (the air fills a room and cannot escape easily creating high pressure) or negative (air escapes easily from a room creating a vacuum effect). Positive and negative air pressure in certain parts of a home can be identified by such things as slamming doors, wind like noises, and rooms that feel hotter or colder.
When airflow is restricted by something in a duct, or from leaks in ducting (such as into enclosed wall areas), it can cause cold or hot spots in certain areas, noise or vibration. These situations can also increase the time it takes to heat or cool a home, increasing the energy bill due to inefficient energy usage. Having the ducts cleaned in a home is one way of making sure that ducting is clear of debris (in addition to removing contaminants that constantly get blown across and affect a homes air quality).
Home Air System Inspections are available from professional providers if you feel this may be warranted.