SEER2 vs SEER: What’s the Real Difference? Tony breaks down why SEER2 replaced SEER—and what it means for your next HVAC system.

👋 Hey, Tony here…

You’ve probably seen both SEER and SEER2 ratings when shopping for HVAC systems—like the Goodman 5 Ton 14.3 SEER2 with R-32 refrigerant.

And you’re probably asking:

“What’s SEER2? And how is it different from regular SEER?”

Great question. Let’s break it down clearly—and back it up with real sources.

📐 What Is SEER?

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently an AC system cools over an entire season.

• Higher SEER = greater efficiency

• It’s like MPG for your air conditioner

• SEER was the long-standing standard until 2023

🧾 Reference:
U.S. Department of Energy – Central AC Basics

Covers the basic concept of SEER and how it's used in HVAC efficiency ratings.

🔄 What Is SEER2?

In January 2023, the Department of Energy introduced SEER2, a stricter, more realistic version of SEER.

The key upgrade: SEER2 uses new M1 testing procedures, which account for external static pressure from ductwork and air filters.

🧾 Reference:
AHRI – SEER2 and 2023 Regulatory Changes

AHRI explains how SEER2 came to be and what it changes in performance testing.

📊 Why SEER2 Matters to You

Here’s why SEER2 ratings are a big deal for homeowners and contractors:

• More realistic: Reflects performance with actual duct systems

• Required: As of 2023, all new central AC and heat pumps must use SEER2

• Rebate eligibility: Many state/federal programs now require SEER2 values for incentives

• Better sizing: Helps avoid over/under-performing systems

🧾 Reference:
ENERGY STAR – SEER2 Product Requirements

Lists SEER2 thresholds for ENERGY STAR certification and rebate eligibility.

🧮 SEER vs SEER2 Conversion (Rough)

If you’re comparing an older SEER rating to SEER2, here’s a basic cheat sheet:

So, a system like the Goodman 5 Ton 14.3 SEER2 is roughly equivalent to a 15–16 SEER system under the old test.

🧾 Reference:
ACCA – 2023 Efficiency Standards and SEER2 Transition Guide

ACCA’s guide for HVAC professionals on interpreting SEER2 and handling the regulatory shift.

🧭 Final Word From Tony

“SEER2 is the new gold standard. If you’re buying a new HVAC system, it’s what you need to pay attention to.”

So when you see a rating like 14.3 SEER2, don’t compare it to a 14 SEER unit—it’s already more efficient, and measured under tougher conditions.

Got questions about matching SEER2 to your home or maximizing rebates? Drop me a line—I’m Tony, and I’ve been through every code update in the book.

In the next topic you will read about: What Does SEER2 Mean in HVAC? And Why It Matters for Your Cooling Bill