With the insane heat we are experiencing, several folks in our training group have bought this crate fan to help keep the dogs cooler in their crates.  I recommend buying a couple extra ice blocks, and the DC adapter. The system seems to really help.  Available at Lion Country Supply 800-662-5202   I couldn’t find all the accessories on the web page so probably best to call. http://www.lcsupply.com/Deluxe-Crate-Fan-and-Cooling-System-Kit/productinfo/DCFK/