Explain this

[abevilac]

All week we’ve been hearing about homes in Texas being 20 or 30 or 40 degrees inside and that residents were encouraged to stuff socks in cracks in window frames and tape up doors. Obviously insulation is a good thing but in a state where summer starts early and ends late and temperatures regularly are 90+ WHY aren’t the homes already insulated so as to keep the AC inside the house??? This makes no sense to me.
Thanks for your responses.