Wall Insulation...

[DenverGP]

I installed an Attic Vent/fan with a thermal switch. It helped cool the attic in the summer

I had the roofers install one of these when they re-did the roof:

http://www.homedepot.com/p/Remington...-BLK/204225874

Unfortunately I can't tell exactly how much impact it's having on the house temps, because we had central air and new windows installed as well.

It definitely is keeping the attic space cooler, opening the access hatch on a sunny 80 degree day, and it seemed pretty close to the same temp as the house. Last year, on a sunny 80 degree day, the attic was easily over 100 degrees. So i'm sure it's reducing the interior temps a bit.