1 hp in 3 bedrooms, 2 hp in master bedroom, 2.5hp in downstairs living hall and 1.5hp in upstairs living hall. All coils are concealed, so replacing with new ones would be messy.

So yeah, nothing much can be done other that tell people not to repeat my mistake

Not sure if this is accurate? Can anyone clarify? My existing ac uses r22 gas and if I change to new ac (even without inverter), they all use r32 gas now. Major hacking if I need to change all my pipes.