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The air conditioning and heating system, commonly referred to by the acronym HVAC (heating, ventilating and air conditioning), is the equipment or components both indoors and out that provide a building's "climate control". If installed properly, the three functions of heating, ventilating and air conditioning all work together to provide both a healthier and comfortable indoor living environment.

In residential buildings, the design, installation and service of these components are brought together into a whole house comfort solution in which one or more HVAC systems regulate the living environment. Central City Air designs systems specifically for each residence we visit. Only qualified System Design Consultants can analyze and engineer a specific system application. We always design our systems to provide high humidity removal, comfort and a healthy breathing environment.

Diagram shows the flow of heated and cooled air. At Central City Air, almost all of our equipment is installed in the horizontal position in the attic.

This diagram shows the flow of heated and cooled air. At Central City Air, almost all of our equipment is installed in the horizontal position in the attic.

 

The Heating System

The invention of the central heating system is often credited to the ancient Romans, who historians believed set up a system of primitive ductwork, which were filled with hot air generated from a controlled fire. Today, heating systems in the Houston area often consists of a furnace or heat pump to heat the air. In a furnace application, the heat is transferred by means of the heat exchanger and generally occurs due to the combustion of fossil fuel. Electric heaters, use an electric applicance that converts electrical energy into heat by means of a heating element. When considering a furnace for the Houston area, the most important criteria are blower capacity. Today's variable speed blowers are the best for energy efficiency and control. An air conditioning system requires proper airflow to function correctly. Airflow capacity is affected by system static pressure. The type and design of the ductwork affects static pressure and resistance, as does the type of supply registers, type of filter system and quantity of return air.

Ventilation

The ventilation portion of the HVAC system is the conversion of air in the home to remove humidity, particulates and other airborne irritants. The ventilation or air circulation includes both air from the outside environment (Fresh Air Intake) as well as re-circulated air inside the home. The ventilation is the most important part of controling the indoor air quality and is used to control humidity and odors throughout the entire home. The factors that control the effectiveness of the ventilation system include, but are not limited to: fan speed (blower), size, type and layout of ductwork, Fresh Air Intake and a proper filtration system.

How it all works

The Air-Conditioning system refers to the components that provide the heating, cooling, ventilation and humidity control for a building (each component will be discussed further below). In essence, the air-conditioning system is design to extract heat from the home by use of a refrigeration cycle. The basic purpose of an Air-Conditioning system is to maintain a relatively consistant temperature range inside a home independent of the temperature outside the home. Air conditioners are designed to use a compressor to create pressure changes between two compartments to continuously pump refrigerant around. The refrigerant is then pumped into a low pressure compartment (evaporator coil), where the low pressure causes the refrigerant to evaporate, taking the heat with it. In the condenser, the vapor is then compressed and forced through another heat exchanger coil, which condenses the vapor into a liquid, disposing of the heat that was earlier absorbed from the cool area inside the home. The cooled air is then pushed through a system of ducts, designed to deliver the cool air through the supply registers, while additional return air ducts draw the indoor air back out of the home and run it through a filter where airborne dust and particulates are removed and then the air is sent back through the supply registers.

Further Reading

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