Chiller Refrigerant Guide: Types, Regulations & Best Practices

Your chiller’s refrigerant isn’t just a technical detail buried in a spec sheet — it’s a regulatory, financial, and operational decision that affects your building for the next 15–25 years. Choose the wrong refrigerant during a retrofit, and you’ll face rising costs, shrinking supply, or outright compliance violations.

The refrigerant landscape is shifting faster than most building owners realize. R-22 is already gone. R-123 is being phased out. Even R-410A — the current standard for smaller systems — faces restrictions starting in 2025. Understanding these transitions is critical for anyone managing commercial HVAC systems in New York.

This guide breaks down every refrigerant you’re likely to encounter, its regulatory status, and exactly what to do if your system uses one that’s being phased out.

The 5 Refrigerants You Need to Know

1. R-22 (Freon) — PHASED OUT — Production and import banned since January 2020. Only reclaimed R-22 is available, and prices have surged from $10/lb to $50–$150/lb. If your chiller runs on R-22, every recharge is more expensive than the last. Plan your replacement now — not when the next leak forces an emergency decision.
2. R-134a — CURRENT BUT DECLINING — The workhorse of medium-pressure centrifugal chillers for the past 30 years. GWP of 1,430 means it faces increasing regulatory pressure. Still legal and available, but new installations are increasingly choosing lower-GWP alternatives. If your system runs well on R-134a, no immediate action needed — but plan for transition at next major overhaul.
3. R-410A — CURRENT, RESTRICTIONS COMING — Standard for residential and light commercial systems (split systems, rooftop units). GWP of 2,088 — higher than R-134a — means it’s first in line for phase-down under the AIM Act. New production equipment must use alternatives by 2025. Existing systems can continue operating and be recharged.
4. R-513A — NEXT GENERATION — A near-drop-in replacement for R-134a with 56% lower GWP (631 vs 1,430). Same performance, same operating pressures, minimal system modifications needed. This is what most new centrifugal chiller installations are specifying today. If you’re replacing an R-134a chiller, R-513A is the straightforward choice.
5. R-1233zd / R-1234ze — ULTRA-LOW GWP — HFO refrigerants with GWP under 7 (compared to 1,430 for R-134a). The future of large commercial chillers. Require purpose-built equipment — no retrofit path from existing systems. Best for new construction or complete chiller replacement where 20+ year regulatory stability is a priority.

EPA Regulations & the AIM Act Timeline

The American Innovation and Manufacturing (AIM) Act mandates an 85% reduction in HFC production by 2036. Here’s the timeline that affects your building:

• 2020 — R-22 production and import fully banned
• 2025 — New residential/commercial AC equipment must use alternatives to R-410A
• 2028–2029 — Further restrictions on high-GWP refrigerants in new commercial equipment
• 2036 — 85% total reduction in HFC production and consumption vs. 2011–2013 baseline

NYC adds its own layer: Local Law 97 sets carbon emission caps for buildings over 25,000 sq ft. Since refrigerant leaks count toward your building’s carbon footprint, high-GWP refrigerants carry a double penalty — both the direct cost of leaked refrigerant and the compliance cost of exceeding your emissions cap.

Every chiller replacement decision made today should assume a 20-year regulatory horizon. Choosing a low-GWP refrigerant now avoids a forced mid-life conversion that can cost 2–3x more than doing it right the first time.

Building Your Refrigerant Transition Plan

Whether you’re managing one building or a portfolio, here’s the approach that minimizes disruption and cost:

1. Audit your current inventory — Document every chiller: make, model, age, refrigerant type, charge size, and leak history
2. Prioritize by risk — R-22 systems first, then high-leak-rate systems, then systems approaching 15+ years
3. Model the economics — Compare 10-year total cost of ownership: refrigerant recharges + energy + maintenance vs. new equipment
4. Choose the right refrigerant — Balance current cost against 20-year regulatory stability. R-513A is the safe middle ground; HFOs are the long-term play
5. Schedule during low-demand season — Fall or spring, when temporary cooling isn’t needed and contractor availability is best