They might even pay a premium for such products." "R600a is an HFC-free refrigerant with no ozone depletion potential and a lower global warming potential compared to earlier refrigerants.

Researchers replaced widely-used, but environmentally unfriendly, R134a refrigerant with the more energy-efficient R600a. They dosed R600a with multi-walled carbon nanotube (MWCNT) nanoparticles.

So this gas will become unavailable within a few years. So you might face servicing problems with your fridge if you don't buy one equipped with R600a gas.