Understanding Energy Efficiency Ratio (EER) in Air Conditioners
Key Takeaways
The energy efficiency ratio (EER) measures how energy-efficient an air conditioner unit is.
Higher EER ratings indicate better efficiency and energy savings.
An EER of 12 or above is considered good.
Choosing an air conditioner with a high EER can lower electricity bills, reduce carbon footprints, and extend its lifespan.
Other factors, such as proper sizing, appropriate installation, and regular maintenance are also important to enhance an air conditioner’s energy efficiency.
Singapore’s hot and humid climate drives a growing demand for air conditioners each year. However, since aircon usage may increase energy consumption, it’s essential to consider efficiency when choosing a unit.The energy efficiency ratio (EER) provides a standardised way to measure the efficiency of your aircon. Here, we’ll help you understand what it actually means so you can make a more informed decision before purchasing an aircon for your home or office.
What is the Energy Efficiency Ratio (EER)?
The energy efficiency ratio (EER) is a metric used to measure the energy efficiency of air conditioner (AC) systems. It’s calculated by comparing the cooling capacity (measured in British Thermal Units or BTUs) of an AC relative to its electrical power requirements (measured in watts). The higher the value, the more energy-efficient the AC unit is.
How to Calculate Energy Efficiency Ratio (EER) in an Air Conditioner?
To calculate the energy efficiency ratio (EER) of your air conditioner, you need to know its British Thermal Units (BTUs) and wattage values. Apply these to this formula:Example:A multi-split air conditioner unit with 9000 BTUs and an electrical power requirement of 680 watts will have an energy efficiency ratio of:
What is Considered a Good Energy Efficiency Ratio (EER)?
It’s generally recommended to choose an air conditioner with the highest EER. The ideal EER rating of your AC unit should be at least 12, or above for optimal energy efficiency.However, EER isn’t the only factor to consider. You should also choose the right AC type, whether it’s a centralised cooling from ducted air conditioner, or a more flexible single- or multi-split air conditioning system that best fits your needs. Considering the BTU capacity is also important to ensure the AC unit efficiently cools your space.
Benefits of Higher EER in Air Conditioners
It’s essential to consider the EER rating before buying an air conditioner. A higher EER rating indicates better energy efficiency, meaning the unit consumes less electricity to provide the same cooling performance as those with lower ratings.How does this benefit you?
Lower Electricity Bills
Higher EER AC units consume less electrical power to run and deliver the same cooling performance as those with lower EER ratings. As the units consume less power, you’ll pay less per hour of operation, eventually lowering your electricity bills at the end of the month.
Reduced Carbon Footprints
Most electricity is generated from fossil fuels which are major sources of carbon emissions. Choosing air conditioners with a higher EER not only lowers your energy consumption but also reduces your carbon footprint. In doing so, you contribute to sustainability and the fight against climate change.
Longer Unit Lifespan
EER rating reflects the system’s reliability. The higher, the more likely it is to be durable, reducing the need for frequent repairs or replacements. This is especially true in hot climates like Singapore, where air conditioners run for extended hours, a high EER unit operates more efficiently with less strain on components, helping to extend its lifespan with proper maintenance.
Is EER The Only Factor Determining Energy Efficiency in AC Units?
EER rating is the standard baseline for determining the energy efficiency of an AC unit. For instance, an air conditioner with a 12 EER rating is generally more energy efficient than one with a 9.5 EER rating.However, EER alone doesn’t fully determine an AC unit’s real-world efficiency, as it is tested in controlled lab conditions with ideal temperatures and airflow. As a result, actual energy efficiency may vary, and other factors also play a key role.
Other Factors Affecting Energy Efficiency of AC Units
Aside from the EER rating itself, these are the other factors that can influence the energy efficiency of AC units:
Room Size and AC Capacity
Make sure to consider your room size and choose the right AC capacity accordingly. This means matching the British Thermal Units (BTU) of the AC unit to your room size. For example, a small HDB room typically requires 9,000 BTUs, while larger rooms with more occupants may need a higher BTU rating.With the right AC capacity, you can ensure optimal cooling without straining the unit. An undersized AC will overwork to cool the space, while an oversized unit may lead to short cycling, causing inefficiency and higher energy costs.
Insulation and Sealing
Insulation and sealing significantly impact the cooling performance of your air conditioner. A well-insulated building retains cool air longer, while sealed windows and doors prevent air leakage, ensuring efficient cooling and preventing energy waste.
Unit Maintenance
Regular maintenance is essential to ensure energy efficiency. Overlooked issues like dirty air filters, clogged coils, and refrigerant leaks can reduce cooling performance, leading to increased energy consumption and electricity costs.
How to Improve Energy Efficiency in Your Air Conditioners
Whether you’re looking to purchase a residential air conditioner, such as a single- or multi-split system, or a commercial unit like a ducted system, ensuring energy-efficient operation is key to lowering electricity bills and reducing carbon emissions.Here are some effective ways to improve your air conditioner’s energy efficiency:
Consider Upgrading Your Unit
Older air conditioner models tend to have lower EER ratings and consume more energy. For a more energy-efficient option, you can consider replacing your air conditioner with newer models that come with higher EER ratings to lower your energy consumption and reduce carbon emissions.
Ensure Proper Installation
Proper installation is as important as choosing models with high EER ratings. This can help prevent issues like refrigerant leaks, poor airflow, or short cycling, all of which can lead to energy wastage.
Perform Regular Maintenance and Servicing
Regular maintenance and servicing help prevent minor issues like dirty filters, clogged coils, and refrigerant leaks from turning into costly repairs.For optimal air conditioner performance, you should ideally schedule maintenance once every three months to clean air filters or replace them if necessary. Once a year servicing is also essential to detect and address problems like worn-out parts, leaks, or electrical issues before they lead to major breakdowns.
Final Thoughts
Opting for a higher energy efficiency ratio (EER) in your air conditioner is beneficial to lower electricity bills, reduce carbon footprints, and possibly extend the unit’s lifespan.However, there are other factors to consider as well, such as choosing the right capacity according to your room size, ensuring proper installation, and maintaining regular unit maintenance, all of which can impact energy efficiency as well.Here at North East, we offer you a range of energy-efficient air conditioning units. Find the best fit for your needs from these options:
EER rating of 12 or above is considered good for air conditioners. It indicates effective cooling performance while using lower energy consumption.
How to calculate EER in AC?
To calculate the EER rating in an AC unit, you have to divide its British Thermal Units (BTUs) by its wattage.For example:An aircon with 9000 BTUs and an electrical power requirement of 680 watts will have an EER of:
What is the average EER rating?
The average EER rating ranges from 8 to 12. Air conditioners within this range are considered efficient for hot and humid climates like Singapore.
