In TX, some think their homes are "unbearably hot" when they reach 78 degrees.

[Manifestor_of_Light]

97. When the humidity is high, it does not cool off at night.

I grew up in Houston, without any central air. It was brutal. My parents had a big window unit in their bedroom, so they were comfortable at night. I did not get a window unit in my bedroom until I was in high school.

Many a night it was too hot to sleep, because it was still hot and humid,85 degrees.
I read James Michener novels.

Even in Austin and San Antonio and Dallas, there's too much humidity to not need air conditioning. For it to cool off at night, you have to go north to Oklahoma where it's drier.
People who live in dry climates don't understand that you have to take the humidity out of the air. Swamp coolers don't work in humid climates.

The higher the temperature, the more water that the air can hold. That's why we use relative humidity instead of using absolute humidity, to calculate the heat index.

The movement of population to the Sun Belt could only happen with central air conditioning. Houston, Dallas and Atlanta are all heavily air conditioned. Much of the South is a humid subtropical climate. You can grow banana trees, avocados and other tropical plants.