Keeping the Pooches Warm and Cool

Thanks for all the replies I think I have found the solution to the heating issue but I still am stumped by the cooling. Whatever I use needs to work off of 12V or propane.

I wont always have the trailer with me when traveling with the dogs so I need a solution that does not depend on the trailer being with me.

Does anybody know of a propane powered aircon unit? Small one roof mounted?