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How Does It Work?

Welcome to Gregg Mechanical Corp., Staten Island's premier Heating and Air Conditioning contractor for residential and business HVAC repairs and new installations.

Air Conditioning: How Does It Work?
When you first enter a home or building that is using air conditioning you feel two things in the air, coolness and dryness. Both of these physical sensations are accomplished by the air conditioning unit. Although you feel cooler that is not really what the unit does. It removes heat and in the process also pulls moisture from the air. In other words, the air conditioner does not cool the air it removes the heat from the air. In the absence of heat is cold.

Part of the benefits of utilizing a central air conditioning system is the filtration of the air in your home which improves air quality.  The filter cleans the air by trapping dust and other small particles that are pulled in through the return.  The more efficient the air cleaner, the better the air quality in your home.  The air handler, the indoor unit, circulates the air while cooling and dehumidifyng it through the process called refrigeration. 

Refrigeration
Refrigeration cools a home by transferring heat inside a home to the outdoors. All central air conditioners employ two main units in this process – the indoor unit and the condensing unit.

The indoor unit
This unit removes undesirable indoor warmth and humidity. It includes the filter, the air handler or furnace, and the evaporator coil. The air handler or furnace blow filtered air through the evaporator coil. The evaporator coil is kept cold by the circulation of a substance called refrigerant.  The fan passes air across this coil and any moisture will condense and collect on the coil's fins. In this process the heat that is in the air is pulled out from the air stream. The absence of the heat is now cooled or cold air is created.  The cooler, drier air that continues through the air ducts is vented throughout your home to maintain your desired comfort level. Depending on the structure of your home, the ductwork may be in the ceiling or on the side walls of your rooms.

The condensing unit
Outdoors, at the condensing unit, an air conditioner releases the heat that was captured inside at the coil. The same refrigerant that absorbed the heat indoors at low pressure is now pressurized by the compressor and is circulated through another coil, the condensing coil. In the condensing coil, under high pressure, the refrigerant releases its heat very quickly, making the coil itself hot. A fan blows across the coil, cooling its temperature down and transferring the heat to the outside air.

Furnaces: How Does it Work?
The furnace is the most important component of a central heating system. It houses all the working parts. So when you replace the furnace, you replace the vital operating parts of your heating system. It is by choosing from among the different models and brands of furnaces available that you determine the quality and cost of your business’s heating for years to come.

Furnace
The Furnace is part of a forced-air system. Warm air is forced, or blown, through a system of air ducts to each of the rooms in your home.  Air drawn into the furnace passes through a filter, where dust and other small particles are trapped. A blower unit blows the filtered air through the furnace, and the air absorbs heat and distributes it throughout your home.

Gas Heat
If it is a gas furnace, the heat is supplied by the burning of natural gas. A mixture of gas and air flows into the burner and is ignited by the pilot. Combustion occurs, and warm air from the burner flame rises to fill a chamber known as a heat exchanger. The heat exchanger becomes hot. Office air passing around the heat exchanger absorbs that warmth, continues into the air ducts and the heat is distributed through the business.The by-products of combustion pass upward through a venting system and escape through a vent in the roof.

Electric Heat
If the furnace is electric, heat is generated by an electric heating element. Electric current traveling through the element creates heat. By the heat transfer processes called conduction and convection, heat is transferred into the air stream and flows through the air ducts into the rooms of the business.

The Thermostat
Whether you heat your home with gas or electricity, a wall thermostat will be installed. This measures room temperature and turns the central heating system off or on as the temperature rises or falls to designated levels. Careful location of the thermostat is an essential consideration in maintaining maximum comfort levels in your home.

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