I have had an air condotioner that was far more powerful (at least 3 or 4 times more powerful) and used much more electricity (when actually running) then was considered to be needed for that room.
Later I have had units that were supposed to be “the proper size” for the room.
The larger and more powerful one saved me a huge amount on my electric bill.
For one thing, it did cool the room down very quickly (and after a long hard day of physical labor where I felt like I had been in a hot muggy steam bath full of dirty air and dirty water, that quick colling made the difference between getting to bed at a reasonable time, or staying up much later taking showers and the drying off and still being too hot or just staying up waiting to try and cool down) which by itsef made it worth it.
Also it made the room so cool that it was quite comfortable for many hours afterwards which meant many hours per day where the electricity was not being used.
I could use a timer and have it go on for about 30 minutes and stay off for the next 3-4 hours even on the hottest and most horribly humid, days.
Since I like it far colder then most other people, I would imagine that the average person could probably have it off, for at least twice that long, after it cooled the place down.
All the other air conditioners I have had that were said by the ‘experts’ (as well as friends and neighbors) to be,
“the proper size” for the room were never cool enough for me and I had the run them al the time during summer and still it was never cool enough for me.
This wasted a huge bundle of electricity, and really ran my bill way up.
Add to that, the fact that I had to still use fans, because the air was still not cool enough and people ahve told me that running fans is not so cheap either, especially when it is in addition to, and not in place of…running the air conditioner.
I’ll, take a way over powered unit as opposed to a small
‘putt putt’ “barely do anything” device (no matter how ‘right size, the experts and your friends and family claim it is’), any day.