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

If the air conditioning in your home is at its peak cost of repair and energy bills may make it worthwhile to invest in the purchase of a new unit. A residential HVAC expert can help you determine the best option for your needs.

Gas-powered air conditioners, also known as propane air conditioners use natural gas for heating and running condensers.


An evaporator coil is a component of your air conditioner that cools your home. The evaporator is inside a box that is connected to your gas furnace or within it (if you own one). If you don’t have one, the coil can be found inside an air handler. The evaporator is where the refrigerant turns into a liquid and then absorbs heat in your home’s air.

The evaporator is comprised of one or more copper coils tightly packed. The refrigerant is able to reach the coils at a low pressure, which makes it easier for it to transfer heat when it evaporates into gaseous state.

A fan blows your home’s warm indoor air over the evaporator coil. The air is then cooled through the removal of heat from the evaporator which alters the refrigerant’s temperature and lowers your indoor air temperature. The cooled air is circulated through the ductwork of your home to each of the rooms.

The evaporator, in contrast to the compressor, needs to raise the boiling point of the refrigerant down to a low temperature to allow for efficient air cooling. The evaporator has its own fans to accomplish this objective.

The metering device in the evaporator helps to ensure that the refrigerant maintains a constant level of liquid within it. The float on the low-side is designed to open when there is no liquid in the evaporator and it closes when it sees liquid enter the coils.

There are two primary types of evaporators: Cased and uncased. A cased evaporator is the one you’re most likely to see in your home because it’s contained within the metal casing of your air conditioning unit. An uncased evaporator is similar but it doesn’t have the protective outer shell.

While both evaporators have the same purpose, it’s important to choose a model that’s capable of meeting the requirements of your house. For example, some models are more suited to harsher working environments, while others are better suited to more moderate conditions. Think about how easy it would be to clean and maintain your evaporator. This could save you time, money and hassle.


Condensers are among the three primary components of your home’s cooling system. They help it work efficiently. The condenser is situated outside the house and connected to the evaporator by refrigerant pipes. It has metal fins and fans which help remove heat from the refrigerant that has been transferred from the evaporator. The heat that is emitted allows the refrigerant to reduce in temperature and then transform into a liquid state.

A compressor is connected to a condenser unit. It operates to pressurize low-pressure liquid refrigeration that is pumped out of the evaporator coil. The squeezing action of the compressor raises the temperature of the coolant which then flows into the condenser coils to absorb latent heat from the air around it. When the cooling process is completed, the refrigerant will be introduced into the compressor, where it will be pressurized prior to being pumped back to the evaporator coil.

The condenser unit is exposed to elements due to its location outside. Debris like twigs or leaves grass clippings or roofing shingles, can damage the condenser. A universal HVAC condenser will protect your heating and cooling equipment from damage when not in use.

Beware of shading the condenser. This can impede air flow and make the compressor work harder to cool your home. This could result in increased energy costs and possible loss of refrigerant.

Regular maintenance will ensure that your HVAC system is working correctly. Regularly having a professional technician inspect all major components of your HVAC system will assist in avoiding major problems. Additionally, having a professional service team check the refrigerant levels on a regular basis can help prevent any problems from developing. Follow these steps to extend the life of your heating/cooling system and reduce energy bills.


The compressor is the core of your air conditioner. It circulates refrigerant throughout the system, ensuring that everything stays cool. It’s similar to the blood of your body when it pumps coolant between the evaporator coils and condenser. If the compressor fails, the evaporator will not be able to do its job and your house will be extremely hot.

There are several different kinds of HVAC compressors and each has its own advantages and disadvantages. For instance the reciprocating compressor is comprised of an engine that moves between up and down inside the cylinder. This action creates suction which draws in the refrigerant. As the piston moves downward, it reduces gas volume. A discharge valve then opens to release the pressurized refrigeration from the condenser.

This type of compressor also includes a clutch and a crankshaft that helps the piston in compressing the air. A Rotary compressor, on the other hand, has blades inside the cylinder that assist in helping compress the air. This type of compressor is quiet, which makes it an ideal choice for residential applications.

The HVAC compressors of both kinds are designed to increase the temperature of the liquid as it is compressed. This results in the formation of a high-temperature, high pressure vapor. Since heat naturally flows from higher-temperature substances to lower temperature ones, the hot vapor will move into the evaporator coils, and transform back to its original liquid state.

You can avoid the majority of AC issues by keeping up with your maintenance schedule. This will allow your equipment to last for many years, and will give you peace of mind knowing that your home is always comfortable. If you do experience problems with your compressor, your Griffith Energy Services technician can assist you in determining which repair options are best for you.


The thermostat is your heating and cooling system’s brain, and it decides when and how the system turns on and off. It compares the temperature of the air to a pre-set desired level. If it is off by one or two degrees the thermostat will send an electronic signal to bring it towards the desired temperature. The majority of modern thermostats measure temperature by using a digital sensor known as a thermosistor. The thermistor is comprised of two metals that expand differently when heated up and cause the metals to bend in opposite direction. When the thermistor is at the temperature that it is set it informs the circuit board that heating or AC should be turned on.

The touchscreens on the newer models make it easy to program and operate. They can be programmed to automatically heat or cool your house at specific times, which saves you the effort of manually setting it each day. Additionally, they offer reports on energy consumption to help you figure out how to cut down on costs.

If you have an older electromechanical model, the method of operation is a little more complex. It is comprised of a bimetallic piece that is bonded to a vial by mercury. When the temperature changes, it causes the mercury in the vial to tilt, completing or interrupting an electrical circuit. When the vial is tipped, it triggers the thermostat to start the heating or cooling system.

It is essential to regularly clean your thermostat in order to eliminate dust. Also, you should ensure that it is not loose or crooked. In some instances, the thermostat’s readings could be incorrect due to a dirty or damaged evaporator coil. In that situation, you’ll have to contact a professional to fix it for you. If you’re experiencing different issue, for instance blank displays Try changing your batteries or ensuring that your breaker isn’t connected. This is a good example of how you can make your HVAC system more efficient by understanding it and optimizing its use.

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