How to calculate the capacity of an air conditioner ① Load < Capacity

Starting today, we'll finally delve into the part you're all most interested in: an explanation of air conditioners. https://www.youtube.com/watch?v=mVeRodrFUKs

Ultimately, I hope to be able to explain it in a way that is more detailed and easier to understand than any air conditioner capacity calculation available online.
The first half of this post is a few minutes long and covers things I forgot to mention yesterday, but these are the points I would really like the president of a construction company to take a look at.

It would be helpful to hear the opinions of practitioners on this matter.