Grand Design A/C Modification 

Save money and reduce noise in your RV! With ~$30 of materials you can make SAFE modifications to your AC units to increase the cooling power throughout your rig. There are "professional" systems out there that sell for over $150 each, but an hour of time you can install this and beat the heat.
Parts needed:
Screw driver (phillips or square head)
(2) 1 inch 2'x2' project foam board (~$5 each)
(1) Roll of HVAC Tape (~$23)
- a way to cut the foam board (we used a jig saw)