Cold snap in Texas and broiler chicks

[Bubblegum85]

Texas temperatures are about to drop here. My 25 broilers have been in their coop for weeks (coldest night was been about 40 degrees) but it's about to drop this weekend to a low of 18.
I'm going to tarp and block the wind but should I buy them an external heat source?
They are 6 weeks old.

 

[Alaskan]

A drop from 40 to 18 isn't that bad.

As long as the wind is blocked, and they have feed and water, they will be fine.