Yes, eleven years ago but sold with the condo but used its 2.0HP Thai R22 F???50GVM, a newer generation sibling in another place after that. Sold that place and moved to a condo now using Samsung Triangle inverter and Sharp Inverter. Both have clean mode with ionizer.
Wow, good to know and thanks for sharing that tip.
And lastly, sometimes noisy could be attributed to vibration. Vibration dampening pads could help also. If possible if you've not installed or laid pipes, use Inaba Denko's Paircoil. These are individual insulation sleeved copper pipes that are very durable as long as installed rightly. High quality copper. That very likely will eliminate vibration due to pipes knocking about in their embedded space inside the wall. Individual sleeve combining both gas and liquid pipe will experience knocking against each other in addition to mixing hot and cold refrigerants. This can cause the compressor to work harder in coolong and damage the cooling fins in the indoor unit where you see ice forming and causing the fins tip bend with tak tak sound. Individually sleeved jacket causes the AC to run at its rated power.