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What is SEER2?

Updated: Aug 4, 2023

The term SEER stands for Seasonal Energy Efficiency Rating, and SEER2 is its modernized iteration that specifically applies to air conditioners and heat pumps. Implemented from January 1, 2023, this updated version has reshaped how we understand and measure energy efficiency.

What does a SEER2 rating signify in an HVAC system? In the context of an HVAC system, the SEER2 rating is an indicator of the cooling efficiency of air conditioners and heat pumps. The efficiency is determined by dividing the cooling output over a typical cooling season by the total electrical energy consumed during the same period.

The enhanced SEER2 metric integrates an improved M1 blower testing method. This adjustment enables the testing conditions to better mimic real-world HVAC system performance. Specifically, the static pressure applied during the laboratory testing has increased from 0.1” w.g to 0.5” w.g., thus ensuring up to five times higher accuracy. These updates also dictate the minimum energy efficiency prerequisite for heating and cooling units.

What SEER2 rating is optimal for an air conditioner?

The efficiency of an air conditioner is directly proportional to its SEER2 rating – the higher the SEER2, the greater the energy efficiency. However, the baseline SEER2 rating differs across regions within the United States. In the North, the SEER2 rating for all air conditioners should be at least 13.4. For the Southeast and Southwest regions, the minimum SEER2 rating depends on the air conditioner's type and capacity. Split system air conditioners in these regions require a SEER2 of 14.3 or more if their capacity is under 45k BTU. For those with a capacity of 45k BTU or more, a SEER2 of 13.8 or more is mandatory. Regardless of the region, split system heat pumps must have a SEER2 rating of at least 14.3. Similarly, single-packaged air conditioners and heat pumps of all regions need to possess a minimum SEER2 rating of 13.4. Note that the system's efficiency may also be influenced by factors like the size of your house, the condition of your ductwork, among others.

What should be the SEER2 rating for my home?

Determining the ideal SEER2 rating for your home isn't straightforward as it depends on several factors unique to your home. These include its location, size, and the specific heating and cooling needs of your household. Since SEER2 ratings vary, it's crucial to consult with a Trane Comfort Specialist™ to identify the most suitable SEER2 rating for optimal comfort and energy savings.

Is a high SEER2 rating worth the cost?

A high SEER2 rating offers superior comfort levels and lower monthly energy expenses, but it often comes with a higher upfront cost. High SEER2 models usually feature multi-stage cooling, enabling the unit to operate continuously rather than in start-stop cycles. If you live in a region with high humidity or have uneven temperature distribution in your home, a high SEER2 unit could significantly enhance comfort. However, if you live in a mild climate with low humidity, you might find a lower SEER2 unit more cost-effective due to lower installation costs. If you opt for a lower SEER2 unit, be sure to familiarize yourself with the updated minimum SEER2 requirements for your area. Your HVAC technician should be able to guide you in choosing a unit that meets those standards.


Salmark HVAC


Lemont, IL

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