Fine, this is more than what I’d usually share online…
I once rented a place about 13 ping on the top floor of a building, it was super hot during the summer. I’m talking about over 35 degrees with the A.C. off. For a while it was fine because I would just turn the A.C. on when I get home in late afternoon. That soon changed when I picked up my first cat from the streets after a seriously typhoon because she became visibly ill.
I soon realized my room was way too hot for her if I don’t leave the A.C. on during the summer. The A.C. was probably no more than 7 or 8 years old when I was living there. It had no inverter, and the compressor was separated, sitting on the roof. When I leave it on most of the time during the summers, my bill was 5000NTD every 2 month, compare to less than 800NTD every 2 month during the winter. Later on, the A.C. was suffering from the abuse, and began to leak and have all sorts of problems.
I resolved the issue by moving away. So I don’t have a comparison of how an inverter A.C. would do in the same room. My new place is a 3 bed room apartment, with a pretty big living room and it has an inverter A.C., which was also about 7 years old when I moved in, so about 2 years newer than the one at the old place. During summer time, I would set the A.C. to run when the temperature go above 30 degrees. My bill right now is just a little over 1,000 every 2 month during summer. Of course, my new place is not on the top floor, I would never do that in Taiwan again.
I obvious was a more extreme case. I left my A.C. on for my sick cat, leaving poor polar bears out to starve. I have read though, with normal usage, you could recover the cost of an inverter A.C. after 8 years.