New Refrigerant For 2024. The 2025 refrigerant transition refers to the new regulations requiring the use of more environmentally friendly refrigerants in hvac systems. The purpose of this fact sheet is to provide an update on ashrae standards for refrigerants and to introduce the new refrigerants that have been awarded an «r» number over the last few.

The phased approach will assure. R32 and r454b are expected to cost approximately 15% more than r410a initially.