How will cold hardy chickens do in a hot environment?

[CinnamonQueen]

(This isn't a huge concern of mine. I'm just curious.)
Our two RIR's are supposed to be able to tolerate cold. We live in Texas, where an occasional dusting of snow is about as cold as it gets. We've been thru one summer and they seemed to "pant" a lot and look for shade. (I know that this isn't that big a problem, seeing how they are alive after this summer.) Should I do anything next summer for them?

 

[hotrodflash]

I've been thinking ahead to the summer as well, I plan to provide lots of shade, water and when it is really hot, frozen bottles of water for them to lay against., Possibly shallow pans of water for them to lay in but I don't know if they will "bathe" or not. I am just going to play it by ear in our Texas heat.