Evaporator Coils: How Do They Work?

How Evaporator Coils Function

HVAC systems use a refrigeration cycle to heat and cool air. The main components are the evaporator coil, condenser coil, compressor, and expansion valve. The evaporator coil absorbs heat from the air and passes it to the refrigerant. The refrigerant then moves this heat to the outdoor condenser coil, which dissipates into the external environment.

When warm indoor air passes over the evaporator coil, the liquid refrigerant inside absorbs heat energy and evaporates into a gas. This cools the air before circulating it back into the home. The evaporator coil is essential for efficient heat transfer and plays a vital role in maintaining comfortable indoor temperatures. The rate of heat transfer depends on the coil design, temperature difference, and airflow rate.

The Benefits of Evaporator Coils

Properly functioning evaporator coils provide the following benefits:

Better temperature control
Preventing system freeze-ups due to reduced refrigerant flow
Improving dehumidification and indoor air quality
Enhancing HVAC system energy efficiency and lifespan

Understanding the Various Types of Evaporator Coils

The main types of evaporator coils are:

Tubed Coils – These typically feature copper tubing with aluminum fins
Microchannel Coils – These coils have thinner aluminum plates for compact size. Some modern coils may use these.
A-Shaped Coils – A-Shaped coils bring enhanced airflow and heat transfer

Evaporator coils are commonly constructed from copper tubing and aluminum fins. Copper provides excellent heat conductivity, while aluminum fins extend the heat transfer surface area.

The Consequences of Poor Working Evaporator Coils

Improperly working or dirty evaporator coils reduce heat transfer efficiency. This can cause a range of problems, including:

Inadequate indoor cooling
Higher energy bills due to an overworking AC system
Reduced system lifespan extra from strain on the compressor
Decline in indoor air quality and comfort
Strange smells from the vents
Excess moisture on windows and walls
Frost buildup on the coils

Being aware of these signs can help you identify problems early and troubleshoot efficiently. If you notice any of these issues, it’s important to investigate further, as there could be an underlying issue with your evaporator coil that needs addressing.

Potential Causes of Failing Coil Performance

There are several possible causes for evaporator coil problems, including:

Dirt, dust, or debris blocking airflow
Refrigerant leaks
Damaged or corroded coils
Coil fins that are bent or crushed
Issues with other HVAC components like fans or valves

Of these common causes, dirt buildup is one of the most prevalent issues that can impede heat transfer. Refrigerant leaks also reduce cooling capacity over time.

Do you understand how your HVAC system operates? Read our guide on the common parts.

Learn More

The Importance of Evaporator Coil Maintenance

To avoid these issues, proper maintenance is crucial for longevity and efficiency. Key maintenance steps include:

Having annual inspections performed to ensure no damage or leaks
Arranging for coils to be cleaned regularly to prevent dirt buildup
Having an expert check coil alignment with the air handler unit
Letting an expert comb coil fins to maintain proper airflow

When to Call a Professional

When facing issues with your HVAC, it might be tempting to look into it yourself. However, touching or incorrectly handling the interior parts can be extremely dangerous. To avoid accidents or more severe outcomes, it’s always safer to get help from a professional, licensed HVAC technician, especially with issues like refrigerant leaks, electrical problems, or coil damage.

Fiddling with the internal parts of your HVAC system without proper knowledge or training can be extremely risky. The inside of an HVAC system is complex, packed with electrical components and refrigerants that, if mishandled, could lead to serious injury or even be fatal.

The Value of an HVAC Technician

A trusted technician will start by conducting a thorough inspection of your system, identifying the root cause of the problem without causing further damage. Whether it’s a leak, blockage, or wear and tear on the evaporator coil, they’ve got the tools and expertise to fix it safely. They also perform a comprehensive system test post-repair to ensure everything runs smoothly, something that DIY fixes often overlook.

Moreover, technicians can provide valuable advice on maintaining your HVAC system to prevent future issues. This can save you a significant amount of money, stress, and time in the long run. So, while it might be tempting to solve the problem yourself, remember that some things are best left to professionals. Your safety, and that of your HVAC system, is worth the call.

Find Premier HVAC Coils at ISS Supply: Your Nationwide Leader in Quality HVAC Solutions

Are you in search of high-quality HVAC coils? At ISS Supply, we are the leading wholesale distributor of aftermarket and OEM HVAC coils across the country. Our selection includes top-of-the-line evaporator and condenser coils, as well as specialized DX coils for optimal heat exchange and performance. We take pride in our partnerships with renowned brands such as Goodman, Amana, Daikin, and Carrier, which allow us to offer you the highest quality OEM replacement parts.

Don’t settle for anything less than the best. Trust ISS Supply for all your HVAC replacement part needs.