Cool dog house! One thing that caught my eye...it doesn't look like you pitched the roof at all. On purpose?
I built 2 dog houses back in the early 80s for the 2 dogs we had then, but after someone broke into the back yard (opened a stockade gate that had wood wedged in across the center but no padlock, our dogs have used the same house as LOML and I. Usually in our bed.
In fact, for 8 years or so, I wrote a poem for our Christmas cards that always ended with Dalton somehow getting my pillow. When I ran out of time one year to write the poem, my Mom let me know about it!! 
Sounds like it will be a warm one for the pooch. If really cold, maybe you could somehow mount a light bulb inside that is shielded to keep from burning the dog if bumped in to when turning around to lay down. With the insulation you used, a 25 watter would probably do the trick. Jim.
Coolmeadow Setters...
Exclusively Irish!
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3