Almost certainly. Although at least they all use the newer R32 coolant these days. A typical AC unit uses 0.5 to 1kg of R32 coolant, and releasing 1kg is about the same as 1 person taking a 1000km flight (from a quick search). If you replace the coolant every two years it'll pollute much more from the electricity used than the coolant being released.
Almost certainly. Although at least they all use the newer R32 coolant these days. A typical AC unit uses 0.5 to 1kg of R32 coolant, and releasing 1kg is about the same as 1 person taking a 1000km flight (from a quick search). If you replace the coolant every two years it'll pollute much more from the electricity used than the coolant being released.