Hey, I have a good temporary solution for ya. Get yourself a box fan, replace side panel with a dust filter. use tape to attach. You should have pretty good ventilation to test out if heat is an issue. 
This is pretty smart. Gonna give it a shot!
Simpler solution: Upgrade your dog to a cat. It will just lazily sit and sleep around and not overheat. In summer. And in winter. Always actually. And everywhere. 

Lmao, his face! So cute! :3
Yeah, i was thinking in upgrading my dog, so i will go for the cat. Then, if i can afford it, i will upgrade it to a polar bear so i have some really decent temperature. I´ll have to upgrade my house to an igloo tho.
or you could just dress your dog as a cat.. 
You could also take one of those smaller hand coolers and mount it on his collar so it keeps his back cool. 
Tried, but he only accepts this
