I have two wall mount ac units. They have up to five years, so you are right to choose this type of AC. The wall ac is tested by the times. I would recommend buying a BrandsMart but do not forget to clean it periodically. I mean here cleaning and checking air filter or cleaning pipes, blower wheel, and drain pans. Also, I would recommend these guys on https://www.airconservicingsingapore.com/ who is gonna do all this job.
Qualified workers, quick service, and reasonable price. I call them once a year to check my AC if it needs a chemical wash or chemical overhaul.

He is crazy, and I wished I had his courage and daring. Personally, this guy inspired me to get out of my comfort zone. I wasn't a big fan of fishing or camping, but since I watched his adventure, I told my wife, darling, let's buy a canoe and do some crazy stuff too because we have lived a boring life till now. We used to travel abroad, eating in good restaurants, sleeping in hotels, and having Italian breakfast.
So, we consulted many blogs in search of gears and places. Thankful for discovering Outdoor Life Cafe, here we got all the information needed for buying the necessary stuff. Now, are one year adventure couple, that trying to discover all beautiful places of Orlando.