Insulation questions...Permanent yurt in Burleson County Texas...

[Corvi&Alexis2018]

We are looking to start building our permanent yurt home in the next few months. It will be 24 feet in diameter. We will not be connected to local utilities. We will have some solar power. We do not want air conditioning in our yurt. I found Len Charney's book "Build a Yurt". It has been a great in helping me to understand the basics of a yurt. I am about halfway through it right now with many notes in the margin.


A bit of background info to help answers to my questions:
We live on the edge of Central and East Texas. Our climate here is mostly hot and humid. The average temperature from April to mid-December ranges from 80°F - 120°F with a humidity factor of 80%-100%. The higher end temperatures being from the months of May - October 1st approximately. Our "winter" is more like everyone else's Autumn. We do not get snow. There are times where we can get plenty of rain however. It is not unusual to get 10 inches - 20 inches of rain in one to three days of consecutive rain.

In winter we rarely have a hard freeze. There might be a handful of days and nights of 40°F for the high temperature and under 32°F for the low. All and all our winters are very mild to none existent. During winter solstice last year it was in the 80's and very humid. I almost wore shorts to my parents for their Christmas breakfast but mosquitos made me think better of it.

With all this in mind and knowing we will not have any air conditioning units for our home, should we put

insulation

in our walls, floor, and ceiling?

Would we still need some kind of plastic sheeting for a

moisture

barrier in the walls?

The yurt will be raised by at least four feet above a professionally done foundation slab. The yurt we are building on our own.

I want it to have air flow underneath to help keep it cooler during the 2-3 months of 100°F+ temperature. Since our heat index during those times is between 110-120°F. We will have the crown cap raised 4-6 inches above the roof. I will put screening around the gap to keep bugs outside. My thinking is this will promote air circulation through the house in conjunction with the solar powered ceiling fans we will have.

Thank you for your suggestions and comments.