SEER2, Inverter Tech & A2L: What HVAC Contractors Need to Know Now
The HVAC industry is undergoing one of its most significant shifts in decades. Between SEER2 efficiency standards, inverter-driven systems, and the A2L refrigerant transition, there’s a lot to unpack and even more to get right on the job site.
This guide provides HVAC contractors with a clear breakdown of what matters today, outlining the steps to take now to stay compliant and competitive.
What is SEER2 and how does it impact HVAC contractors?
SEER2, which stands for Seasonal Energy Efficiency Ratio, is an updated energy efficiency rating system that better reflects real-world operating conditions. It is now required for all new and replacement residential air conditioning (A/C) and heat pump systems in North America.
It took effect January 1, 2023. It replaces the older SEER metric and uses a tougher testing standard, specifically, one that accounts for higher static pressure during operation. As a result, SEER2 ratings appear lower than the SEER numbers for the same equipment.
As an HVAC contractor, here’s what you need to do:
- Know your region’s SEER2 minimums (usually 13.4 to 14.3).
- Ensure that any pre-2023 SEER equipment still in inventory is compliant with current regulations and legally permitted for installation.
- Explain to customers who notice the number drop that it’s not less efficient, just a new testing standard.
What is inverter technology, and why should contractors care?
Inverter-driven systems adjust compressor speed based on demand, offering better comfort, efficiency, and long-term performance, and they’re no longer just for premium installs.
Instead of turning on and off like fixed-speed systems, inverter compressors ramp up or down to match the heating or cooling need in real time. That means fewer temperature swings, less energy use, and a quieter, smoother-running system.
Here’s why it matters now:
- Inverter systems can save homeowners 30–50% on energy costs.
- They reduce strain on components, helping systems last longer.
- They’re key to meeting SEER2 and cold-climate performance expectations.
- Smart homes and zoning systems work best with inverter-based HVAC.
This isn’t a future trend as it’s already standard across many models. If you haven’t already started installing inverter-driven units, now’s the time.
How do HVAC contractors in Canada prepare for the transition to A2L refrigerants?
While A2L refrigerants are not yet mandatory in Canada, the transition is already underway. Many manufacturers are shifting toward low-GWP alternatives, such as R-32 and R-454B, and some equipment shipped into Canada now uses A2Ls by default.
A2Ls are classified as mildly flammable and introduce new considerations for tools, training, installation, and transport. The shift won’t happen overnight, but the groundwork is already being laid and forward-thinking contractors are getting ready now.
Here’s how to prepare:
- Stay informed about upcoming code updates, including CSA B52-23 and provincial regulations.
- Attend A2L safety and installation training offered through suppliers or your local ECCO Supply Branch.
- Upgrade tools to A2L-compatible recovery machines, leak detectors, and charging equipment.
- Review storage and transportation requirements for A2L refrigerants especially in vans and warehouses.
