The Six Most Important Sections of the HVAC System

Understanding the different parts of the HVAC system may help you to properly maintain it, and learning about the air conditioner and the heater will make the fixing problems and the findings easier. That way, you’ll prevent expensive breakdowns, inconvenient, keep the system working in its peak efficiency, and then be sure your home stays comfortable.

The most important sections or parts of the HVAC system are here below.

Heat Exchanger

The heat exchanger is the part of the house of your furnace. It warms cool air and absorbs heat when the thermostat activates the furnace and also the heat from the combustion rises. Every kind of furnaces has the heat exchangers with electric units. This essential component contains the strong stainless steel and with temperature-defiant alloys to prevent damages and cracks, and some models had that special duct for allowing the cool air to enter the heat exchanger faster plus make you relaxed in a hurry.

The issue with the heat exchanger could direct to the carbon monoxide leak that may cause nausea, headaches, or death. Since the carbon monoxide is odorless and colorless, you must have detectors being installed in your bedrooms and kitchen if you have the wood or the gas furnace. Also, you must have every part of the heating and the air conditioning system expected for issues by an expert at least once every year.

Blower Motor

Right after the air inside the heat exchanger reached the preset temperature, the electric blower motor powered the fan that forced the warm air in your home’s ductwork, by the air registers, and to all the areas in your house. Combustion ends just before a blower motor stops functioning, so all those warm air inside the heat exchanger and the ductwork will get into the areas of the house before the motor close down to stay for the following heating cycle.

The erratic speed blower motor may run in different speeds to accurately control the air flow around the house. It will monitor the HVAC system and will compensate for lots of issues. Since the erratic speed blower motors reaches full speed gradually, they are not as loud and they may lower the humidity more effectively during summer. Homes usually reached the ideal temperature just before variable speed components reach the full speed, and so they save energy as well.

Combustion Chamber

Oxygen should be available to have proper combustion, and the furnace adds air into the fuel inside the combustion chamber, that is also named as the burner. For the gas furnace, a heating cycle begins when the little amount of gas and air mixture enters a combustion chamber. Then, the pilot light or the glow stick ignites the mixture then it burns in the controlled fire as there lots of air and gas that move into a burner.

The glow stick is the electronic ignition system, whereas the pilot light is merely a tiny tube which constantly releases the little amount of gas to become for the flame. The glow sticks automatically light, but the homeowners need to relight the pilot lights when they went out. Only the older furnaces have the pilot lights since they are using more gas than the glow sticks. Also, they’ll release carbon monoxide when they go out, that will cause the safety hazard.

There are some high-effective gas furnace that has the second combustion chamber which unburned fuel, captures carbon monoxide and compressed it before it ignite again. In this manner, you can take every bit of the energy from fuels and some other natural gas. Some systems have integrated circuit board also to monitor the furnace and also to activate (LEDs) light-emitting diodes if there is an issue.

Compressor or Condenser Coil

Your compressor or condenser coil is part of the heat pump or air conditioner, and it’s normally installed outside the house. The condenser cools the house through releasing heat to the outdoor air. It happened when it compressed and condensed refrigerant from the warm gas to the cold liquid. Also, the fan blows the air over a compressor for dispersing the heat and also to cool the refrigerant even faster. Then, the HVAC system transmits the liquid refrigerant by the copper line, tube or aluminum to the evaporator coil.

To prevent problems and to save the energy with the HVAC system, you must keep the fallen leaves, dirt, grass clippings, and some other debris away to be from the condenser. Once every year, turn off your power to the outdoor unit and then rinse it off together with the garden hose to be certain that it is clean. You should add an awning also for extra shade and also protection for the unit and you must leave some feet of open spaces on every side for a better airflow.

Evaporator Coil

The evaporator coil is one important piece of the heat pump or the air conditioner that is inside the indoor air handler system. The HVAC system takes the refrigerant to the series of little nozzles or the expansion valves, and these valves sprays the liquid refrigerant that it may evaporate from liquid to the gas even faster. It absorbs heat and then lowers the temperature inside the house.

The HVAC fan blows system warm air from the house by return ducts and above the evaporator to make it cool, then it distributes cool air by the ductwork and in the areas of the house. After that, the system transmits the refrigerant gas going back to the condenser coil and begins the cooling cycle. When the humid air touched the colder evaporator coil, it will make condensation. It lowers the level of humidity in the house and will make the indoor air cooler, and saving more energy during summer.

Heat pumps function like air conditioners, they have similar parts. They will reverse the heat transferred process during winter to take heat from the outdoor air to the house and then get rid of the cold air. Bu using the heat, it will make the air dry and will irritate your eyes, nose and skin. You may use the humidifier to make the house more comfortable and to prevent these issues.

Condensation on the evaporator will encourage mold growth, plus dust and dirt normally will build up over damp coils. The leak in the refrigerant line may lead to ice over the evaporator coil, even during the middle of summer. The issues will make the transfer process of the heat less efficient, could cause harm to the HVAC system and may lower the indoor air quality. Sufficient ice or mold growth may even obstruct the airflow system and will cause an expensive and inconvenient breakdown.


The thermostat has temperature sensor that decide when the air conditioner and the heater will turn off and on, and also controls for users. It is directly connected to the system by special wires. The great place for the thermostat is close by the core of the house, away from stuffy drafts and areas. Some air conditioning and heating systems have over a thermostat, and every thermostat controls the different zone. That manner, you may save energy by heating or cooling the occupied areas only and all the staffs of the household will choose the temperature that is most at ease for them.

With the setback thermostat or programmable thermostat, you may set the thermostat to automatically alter its temperature according to the routing. This will help you save money, energy and time. Some models will set a diverse schedule for the weekends and weekdays, while others will alter the temperature scheduled daily.

When you leave your home, turn the thermostat’s temperature setting below during winter and up during summer. Set the programmable thermostat to take the house back to its comfortable temperature in half an hour just before you go back so that the indoor air has sufficient time to warm the level or cool it down. You may control lots of programmable thermostats coming from anywhere with the Smartphone or computer. Other units will monitor your house humidity and even discover the temperature preferences.

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