i'm using 1hp normal a/c at the moment, however the room is not cold enough
Therefore im thinking of upgrading to 1.5hp
But R22 A/C is difficult to find now........

Can i buy R410A (non inverter) and use back my piping?.. My piping all concealed , came with house. (5 years old).

I heard need to flush the pipe and make sure it is clean..