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What is the biggest difference between the older R134a and the newer R1234yf?

R1234yf is more environmentally friendly but is mildly flammable and requires special handling.

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R1234yf is eco-friendlier but needs special handling.

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Answered by Sonny Baird

Last updated 1/16/2026, 3:05:59 PM

R134a and R1234yf are similar, however, R1234yf was created as a more environmentally friendly replacement to R134a. The biggest difference between the two, is that R1234yf is mildly flammable and does require special handling.

Sonny Baird
Sonny Baird

General Sales Manager, West Mitsubishi

Tags: Service,A/C Service,Refrigerant Types,A/C Systems,Environmental Safety

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