Evaporator coil is one of the most important components in an HVAC system. They work with other components such as blowers, condensers, and coils to provide cooling for homes and businesses. In addition, these coils need proper maintenance because they can affect how well your heating or A/C functions. Here is everything you need to know about evaporator coils: their types, working principles, and importance in an HVAC system!

What Is an Evaporator Coil?

These are the coils that release heat in an HVAC system. They can work with either gas or electric furnaces and air conditioners to provide cooling for homes and businesses. Evaporators consist of a set of corrosion-resistant finned tubes that take up much less space than other coils such as condensers.

These coils play a vital role in maintaining the temperature of the premises. If these coils do not work fine, the temperature will increase. In the coils, there is a refrigerant that absorbs heat from inside and releases it outside as per requirement.

Evaporator coils are also known as cooling coils or compressor coils. They help in reducing or canceling humidity present in air by releasing water vapors into the atmosphere through an evaporating process that uses low-pressure gas to absorb high-pressure liquid refrigerants.

Types of Evaporator Coils:

There are two types of evaporators – all copper and aluminum/copper coils. Copper coils have good thermal conductivity, but these cost more than aluminum/copper coils do. However, they can resist corrosion better than aluminum alloy ones can, which makes them last longer than their counterparts! An issue with coils made of pure copper is that they are difficult to install, which increases the cost further.

Aluminum coils have good heat transfer properties, but their corrosion resistance capabilities are low, which makes them lose their sheen over time. The pressure drop in this kind of coils is also higher than coils having a mix of aluminum and copper do due to lower thermal conductivity levels. These coils are comparatively cheaper, however, so it depends on your budget as well!

Air Conditioner Evaporator Coil:

The coils of a refrigeration system are also popular as the AC Evaporator Coil. The coils are located in front of your furnace’s blower unit and make use of an electric fan to circulate air over them, which then cools it down. In this process, heat from inside your house gets absorbed by these coils that have been cooled using Freon gas.

Trane Evaporator Coil:

Trane Evaporator Coil are also one of the best coils in the USA. These coils have a big base plate made up of aluminum. Furthermore, these coils do not contain any kind of insulation, due to which they can easily dissipate heat into the atmosphere. However, this type is less popular now as other coils have replaced them because they have good amounts of thermal insulation material on them.

Carrier Evaporator Coil: 

Carrier Evaporator Coil are of two types. They can be either single-row coil or double-row coils. These coils use aluminum fins for heat dissipation, and they also have high thermal resistance, which means that it takes more time to dissipate the heat into the atmosphere as compared to other coils available in the USA market. The material used on these coils is Fins with powder-coated galvanized steel endplates. This type has good performance characteristics because of its structural rigidity, compactness, and ease of installation.

Working of Evaporator Coils:

Evaporators work by absorbing water vapor present in air through an evaporating process that uses low-pressure gas (refrigerant) to absorb high-pressure liquid refrigerants like R22 or R410A; then change into vapors under low pressure.

You can see these coils in refrigerators, air conditioners, and heat pumps. These coils use the evaporating process to produce coldness by absorbing water vapor present in the atmosphere through an evaporating process that uses low-pressure gas (refrigerant) to absorb high-pressure liquid refrigerants like R22 or R410A; then change into vapors under low pressure.

The coils are generally made up of small tubes that have thin metal fins around them called heat exchangers. This type is used in commercial applications where compressor systems experience frequent start/stop cycles because it can dissipate excess heat quickly due to its good performance characteristics, including structural rigidity, compactness, ease of installation. More importantly, this coil works with less noise and vibration.

In residential cooling coils, the refrigerant flow direction through coils is from inside to outside (this means down-to-up). The reason behind such design decision was primarily for user-friendliness; people would find it easier if their evaporator coils were located at a higher level than flooring level, which allowed gravity to help run water out of the coils.

Importance of Evaporator Coils in the HVAC System:

As we know, coils are an integral part of HVAC systems, and their importance is also high. Without coils, the system would not be able to function properly because coils play a crucial role in transferring heat from one place to another. The coils transfer this heat by using refrigerant, which absorbs it when evaporated at low pressure then gradually transfers that energy into a surrounding area when it condenses under higher pressure. In other words, these coils work with the help of a gas compressor or electric motor through reciprocating motion (back-and-forth).

If these coils are not working properly, then the coils will not be able to transfer heat. This would result in high pressure at low temperatures. So, coils are an important part of any HVAC system. We should care for them while installing or replacing them so that they work properly.


Evaporator coils are an important part of HVAC systems. You will see them in air conditioners and refrigerators. but they will always have the same basic function- transferring heat from inside a home or building into the outside air. These devices work so well because their design is uniquely suited to this task. The coil’s shape and construction allow it to both condense and transmit heat more efficiently than any other type of device on the market today. 

There are three different types of evaporator coils that you might encounter when maintaining your own heating or cooling system. Each with its own strengths and weaknesses depending upon what environment it needs to operate within. Understanding how these components work together is key for ensuring efficiency as well as longevity. I hope this blog will have to provide you brief information about these coils. Thanks for reading!