don't wanna sound like shill but for all people claiming you need some permit when installing one they should look into something like Midea PortaSplit - it's portable, but at same time it's like your regular multisplit unit, much more efficient

personally I have at home Toshiba, father has Mitsubishi, but when living in China had experiences with all major Chinese brands like Gree, Midea, Haier, etc. and would have zero worries about their quality, they produce shitton of them for CN market