You forgot the corollary to the Failure of Your Air Conditioner Rule.
Not only do the air conditioners fail, they are legally bound to fail after 5:00 P.M. on a Friday. That way you have to do without all weekend or call a repairman at triple overtime weekend rates.
LOLOLOLOL! Too, too true.
I remember when my AC failed a few weeks after the warranty expired and my husband sent a lengthy TELEX (before Faxes were invented) to the CEO of Carrier in New York. It ended with the words, “And now I have to spend Easter in Houston with no AC!”
To their credit, we had Carrier repairmen at our door on Monday morning after Easter and they replaced the air conditioner with a better model at a discounted price because we had complained prior to the warranty expiring and had been told that it was OK.
It was still a sweaty Easter dinner that year.