What the R-410A Phase-Down Means for Ontario AC Buyers in 2026

If you’re shopping for a new air conditioner or heat pump in 2026, you may have noticed the refrigerant has changed — your installer is talking about R-32 or R-454B instead of the R-410A that’s been standard for two decades. The natural question: “What does this refrigerant change mean for me, and should I wait?”

Short answer: it’s a good change, it’s industry-wide, and there’s no reason to wait. Here’s the detail.

Why refrigerants are being phased down

The refrigerants used in air conditioners and heat pumps are powerful greenhouse gases if they leak. To address that, countries agreed under the Kigali Amendment to the Montreal Protocol to phase down high-impact refrigerants over time.

Canada is doing exactly that. Canada controls and is phasing down hydrofluorocarbon (HFC) refrigerants under the Ozone-depleting Substances and Halocarbon Alternatives Regulations, in line with the Kigali Amendment. The practical effect: the high-impact refrigerant that filled systems for years, R-410A, is being replaced in new equipment by lower-impact alternatives.

How the new refrigerants compare

The measure that matters here is Global Warming Potential (GWP) — essentially how much warming a refrigerant causes relative to carbon dioxide if it escapes. Lower is better. Here’s how the new refrigerants stack up against the old standard:

• R-410A (the outgoing standard): GWP of 2,088.
• R-32: GWP of 675 — about 30% lower than R-410A.
• R-454B: GWP of about 466 — roughly 78% lower than R-410A.

So a system bought today using R-32 or R-454B carries a dramatically smaller climate impact if it ever leaks. That’s the entire point of the transition, and it’s why the equipment on the market now is built around these refrigerants.

The catch: these are NOT drop-in replacements

This is the single most important thing for a homeowner to understand, because it shapes the buy-versus-repair decision.

R-32 and R-454B are not drop-in replacements for R-410A. You cannot simply drain an old R-410A system and refill it with one of the new refrigerants. They operate at different pressures and have different properties — switching refrigerants requires new equipment designed for them.

Why does that matter to you?

• If you buy a new AC or heat pump today, it comes engineered for R-32 or R-454B from the factory. Nothing to think about — it’s already the modern, low-GWP standard.
• If you’re repairing an aging R-410A system, know that R-410A is being phased down, which over time affects availability and cost of servicing older units. That doesn’t mean your current system is suddenly unusable — but it’s a real factor when you’re weighing an expensive repair on an old unit against replacement.

Should you wait for the dust to settle?

No. The transition is already well underway, the new refrigerants are proven, and the equipment using them is what’s being installed across Ontario right now. Waiting doesn’t get you a “better” refrigerant — it just delays the cooling or heating you need. A new system today is a low-GWP system today.

If you’re deciding whether to replace at all, our guide on when you should upgrade your air conditioner helps you weigh it.

This is also a reason to consider a heat pump

Since you’re getting new, low-GWP equipment either way, it’s worth asking whether a heat pump makes more sense than a cooling-only AC — it uses the same modern refrigerants but heats and cools from one system. Our look at whether heat pumps work in a Canadian winter lays out that decision honestly.

Get a modern, low-GWP system installed right

We install new air conditioners and heat pumps built for R-32 and R-454B, by ESA- and TSSA-certified technicians who handle refrigerant safely and to code. If your old R-410A system is on its last legs, book a free quote and we’ll give you an honest assessment of repair-versus-replace — usually within the hour.