Understanding EER (Energy Efficient Ratio) of HVAC


An HVAC system is an essential component of any building, providing heating, ventilation, and air conditioning. However, operating these systems can be expensive, leading to high energy bills. Therefore, it is essential to understand the Energy Efficient Ratio (EER) of an HVAC system to ensure it is operating efficiently.

What is EER?

EER stands for Energy Efficient Ratio, and it is a measure of an HVAC system’s efficiency. It is calculated by dividing the cooling capacity of the system (in watts) by the power consumption (in watts) required to produce that cooling capacity. The higher the EER rating of an HVAC system, the more efficient it is, and the less energy it will consume.

In addition to the EER, it is important to consider the energy label of an HVAC system. Energy labels provide information on the energy efficiency of a product, including the EER rating. These labels are typically color-coded and range from A+++ to D, with A+++ being the most energy-efficient and D being the least. ( Different countries will have there own energy label system and have different grades. But the basic theory is the same.)

Importance of EER

The EER rating is an essential metric to consider when purchasing an HVAC system. A higher EER rating means that the system is more efficient, which translates to lower energy bills. Additionally, an HVAC system with a higher EER rating is better for the environment, as it consumes less energy and produces fewer greenhouse gases.

Factors affecting EER

Several factors can affect the EER rating of an HVAC system. One of the most significant factors is the age of the system. Older systems tend to have lower EER ratings than newer ones, as technology has advanced, and newer systems are designed to be more energy-efficient. The size of the HVAC system also affects the EER rating, as an oversized or undersized system will consume more energy and have a lower EER rating. Finally, the location of the HVAC system, as well as the weather conditions, can also affect its efficiency.


In conclusion, understanding the Energy Efficient Ratio (EER) of an HVAC system is crucial to ensuring it is operating efficiently. A higher EER rating means that the system is more efficient, resulting in lower energy bills and a reduced impact on the environment. Factors such as the age, size, and location of the HVAC system can affect its EER rating, so it is essential to consider these factors when purchasing and maintaining the system. By understanding and optimizing the EER of an HVAC system, you can save money and reduce your environmental impact.

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