All good points. So, why don't we use CO2 in minisplits? Split systems are most popular in new construction and retrofits, so why are we settling for modern refrigerants like R32 with a large GWP of 675?
It's because CO2 has to be run at more extreme temperatures and pressures, fine for factory-made connections inside a single unit but a showstopper for field joints.
It's because CO2 has to be run at more extreme temperatures and pressures, fine for factory-made connections inside a single unit but a showstopper for field joints.