What Are the Main Parts of Your Heating Air Conditioning Unit?

It might be worth investing in a new unit when your home’s HVAC is a bit old and in need of repairs. A residential HVAC expert can help you choose the best option for your needs.

Most cooling systems rely upon electricity to cool and heat homes, but certain propane or gas-powered air conditioners use natural gas to power furnaces and run condensers in a split system.


The evaporator coil of your air conditioner is the one that cools your home. The evaporator coil is in a box attached to or within your gas furnace (if you have one) or in an air handler, in the absence of. The evaporator is the place where the refrigerant liquid transforms into a gas and absorbs heat from your home’s indoor air.

The evaporator is comprised of one or more copper coils that are tightly packed. The refrigerant is able to reach the coils with low pressure, making it easier to transfer heat as it evaporates into a gaseous state.

A fan blows your home’s warm air through the evaporator coil. This air is cooled when heat is taken away from the evaporator. This lowers the temperature of the air inside. The cooled air is circulated through the ductwork of your home, and then to each room.

In contrast to the compressor, which requires to make the refrigerant gas at high temperatures for efficient cooling, the evaporator only needs to raise its boiling point to a low temperature for effective air cooling. The evaporator uses its own fans in order to achieve this goal.

The evaporator metering device ensures that the liquid refrigerant is always at an unchanging level. The low-side floating is designed to open if there is no liquid in the evaporator and close when liquid is introduced into the coils.

There are two types of evaporators, noncased and cased. The most popular type of evaporator in your home is the one that is cased. It is housed inside the metal casing that surrounds the air conditioning unit. A non-cased evaporator is the same however it doesn’t come with the outer shell that protects it.

Although both evaporators serve the identical purpose, it’s vital to select one that is capable of meeting your home’s unique requirements. For instance, certain models are better suited to harsher working environments, while others are better suited to milder conditions. Think about how easy it would be to clean and maintain your evaporator. This could save you money, time and effort.


The condenser is among the three main components of your home’s air conditioning system which helps to keep it running efficiently. The condenser is situated outside the house and is connected to the evaporator through refrigerant pipes. It has metal fins and fans that work to remove the heat from the refrigerant that is being transferred from the evaporator. The heat removed helps the refrigerant to cool down and transform back to liquid form.

A compressor is attached to the condenser unit. It is used to pressurize the low-pressure liquid refrigerant that has been transferred from the evaporator. The compressor’s squeezing action raises the temperature, which is transferred to the condenser unit to absorb the heat that is trapped in the air. After the cooling process and the refrigerant is pumped back into the compressor where it is pressed again prior to being pumped to the evaporator coil, where the process begins all over again.

The condenser unit is exposed to the elements because it is outside. Debris such as twigs, grass clippings, leaves and roofing shingles too can get into the condenser unit and damage it. Adding an universal HVAC condenser cover to your heating and cooling system can help safeguard the equipment from accidental damage even when it’s not in use.

It is also crucial to avoid shading the condenser. Doing so can restrict air flow and force the compressor to work harder to cool your home. This could result in increased energy costs as well as a loss of refrigerant.

Regular maintenance of your HVAC system can help ensure that the condenser is working properly. Regularly having a professional technician examine every major component of your HVAC system will aid in preventing major issues. A professional service team can also keep your system in good working order by regularly checking the refrigerant levels. Follow these steps to extend the life of your cooling and heating system and reduce energy bills.


The compressor is the core of your air conditioning. It circulates refrigerant through the system, which keeps everything cool. You can think of it like the blood in your body, since it moves the coolant back and forth between your evaporator and condenser coils. If something goes wrong with your compressor, it will stop the condenser and evaporator from completing their tasks and will make your home feeling uncomfortable warm.

There are a myriad of different kinds of HVAC compressors. Each comes with its own advantages and drawbacks. For example the reciprocating compressor is comprised of a piston that moves between up and down inside the cylinder. This movement creates suction that draws in refrigerant. As the piston moves down, it reduces the gas volume, and then a discharge valve is opened to release the refrigerant pressurized into the condenser coil.

This type of compressor includes a clutch and a crankshaft, which helps the piston in compressing the air. A rotary compressor, on the other hand, has blades inside the cylinder which help compress the air. This kind of compressor is quiet, which makes it an ideal option for homes with a small space.

The HVAC compressors of both types are designed to raise temperature of the liquid while it is compressed. This results in a high-pressure, high-temperature liquid. Since heat naturally flows from high-temperature substances to those with lower temperatures the hot vapor will flow into the evaporator coils, and return to its liquid state.

You can prevent most AC issues by staying on top with your maintenance schedule. This will help your equipment last for many years, and will provide you with peace of mind knowing your home is always comfortable. Griffith Energy Services can help you choose the best repair options should you experience a compressor problem.


The thermostat is the brain of your heating and cooling system, enabling it to control the time and frequency at which it is turned on and off. It reads the air temperature and compares it with a preset desired level. The thermostat will send an alert to adjust the temperature if off a few degrees. Most modern thermostats use the digital sensor, also known as the thermistor, which measures the temperature. The thermistor consists of two metals that expand differently when heated up, causing the metals to bend in opposite directions. When the thermistor reaches the temperature that it is set, it signals to the circuit board that heating or AC should be turned on.

The touchscreens on the newer models make it easier to program and operate. They are usually programmed to automatically heat or cool your house at specific times, which saves you the effort of having to manually set it every day. They also provide reports on energy consumption so you can find ways to cut costs.

If you have an old electromechanical model, it’s slightly more complex. It consists of a bimetallic strip that is attached to a vial using mercury. If the temperature changes in the vial, it causes the mercury inside the vial to shift, completing or interrupting an electrical circuit. When the vial tips the thermostat, it activates the cooling and heating system.

It is essential to regularly clean your thermostat to get rid of dust. Also, ensure that it is not crooked or loose. In some cases the thermostat may be experiencing issues with its readings because of a dirty evaporator coil or the thermistor being damaged. In that situation, you’ll require a professional to fix it. If you’re experiencing different problem, such as an unresponsive display, try changing your batteries or checking whether your breaker has not connected. This is a good illustration of how you can make your HVAC system more efficient by understanding it and maximizing its use.

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