May 24, 2022—Honeywell has announced Solstice 456A, a drop-in replacement for use in air conditioning systems.
According to Cooling Post, 456A is a low GWP replacement for R134a. Honeywell has not released the chemical components involved, however they have shared that it is "HFO-based."
Honeywell has stated that Solstice 456A “provides an easy-to-use, economical, drop-in service solution for vehicles manufactured before 2017”, according to Cooling Post.
The assumption is that the gas is R456A. This is a refrigerant blend that was announced for use by Koura, who developed it. Koura is a competitor of Honeywell.
R456A has a GWP of 626 and has shown to match the performance of R134a in automotive air conditioning systems.
Honeywell currently holds patents on R1234yf, which is a refrigerant for use in new vehicles.