In the spirit of summer, let’s start with a baseball analogy: Performance ratings are like player stats for your HVAC unit. But instead of AVG, HRs, RBIs, and OBP, the categories used to measure HVAC performance are SEER2, AFUE, MERV, and HSPF2.
Interpreting what these ratings mean might feel confusing at first, but learning the basics can help you make smarter decisions when upgrading your system. This article breaks down what these acronyms mean and explains why they matter.
SEER2 (Seasonal Energy Efficiency Ratio)
SEER2 is the most commonly referenced efficiency rating for air conditioning and heat pump systems. It quantifies cooling efficiency over a typical season.
Why the “2”? Introduced in 2023, SEER2 replaced the original SEER system that dates back to the 1980s. If your current unit lists just a SEER rating, that’s completely normal. For new systems, SEER2 is now the standard efficiency rating you’ll see.
What You Need to Know: The higher the SEER2 rating, the more energy-efficient the system. That typically means lower summer energy bills for the same cooling performance.
By the Numbers: Nearly every AC or heat pump system in use today has a SEER or SEER2 rating. Older systems often rate between 8-10, while modern systems can range from 13 to 20+. By some estimates, systems with a 20 SEER2 rating could save you up to 35% on your electric bill annually compared to low-rated models.
AFUE (Annual Fuel Utilization Efficiency)
The AFUE rating measures how efficiently a furnace converts fuel, like natural gas, into heat.
What You Need to Know: Energy waste comes with an environmental and economic cost. As a consumer, getting the most from the fuel you consume lightens the impact on the planet and your wallet. For that reason, look for models rated 90% AFUE or higher to ensure you’re not using more resources than necessary to heat your home.
By the Numbers: Modern furnaces can have AFUE ratings between 90-95%, with some of the highest-efficiency models exceeding 98%. Certification requirements can vary slightly by region. As a general guideline, choosing a furnace with the ENERGY STAR seal is a good indicator that you’re making an energy-efficient decision.
MERV (Minimum Efficiency Reporting Value)
It doesn’t get the same attention as outdoor pollution, but indoor air quality (IAQ) often has the same, or worse, pollutant concentration as a metropolitan city square. Over time, it can impact well-being, especially for those with allergies or respiratory conditions. That’s where MERV ratings come in.
What You Need to Know: MERV ratings measure how well an air filter captures airborne particles like dust, pollen, and pet dander. A higher rating equates to healthier indoor air.
By the Numbers: Most standard filters have a MERV rating between 8-13. However, there are a few factors to consider when choosing which is right for your situation. If someone in your home has allergies or sensitive lungs, aim for a filter with a MERV rating of 11 or higher. Here’s the caveat: ultra-high MERV filters can restrict airflow if your system isn’t designed for them. Before choosing a high MERV filter, contact a Hoock’s technician to ensure it’s compatible with your system.
HSPF2 (Heating Seasonal Performance Factor)
Similar to SEER2 ratings, the Heating Seasonal Performance Factor (HSPF2) measures heat pump efficiency in heating mode (as opposed to cooling).
What You Need to Know: Unlike furnaces and air filters which have a single AFUE or MERV rating, heat pumps have two: SEER2 and HSPF2. In an area like the Midwest, which sees long stretches of cold and warm weather, both ratings help paint a full picture of overall heat pump efficiency.
By the Numbers: A system with an HSPF2 of 8.2 or higher is considered energy efficient by today’s standards.
Optimize Your Home Environment with Hoock’s Heating & Cooling
An HVAC system does more than just keep you cool in summer or warm in winter. It’s the heart of your home. Factors like energy efficiency, air quality, and of course, your comfort, are all impacted by the system you choose and how well you maintain it. These ratings offer helpful insights when you’re choosing or upgrading your system.
The experts at Hoock’s Heating & Cooling want to ensure your time spent in the great indoors is as healthy, comfortable, and affordable as possible. Contact us today to schedule an appointment and take the first step toward a more comfortable, energy-efficient home.