[DQDick]

If you have made sure your return air is open going back to the AC unit (some have collapsed and had to have pvc pipe installed to open them back up. Then you should consider taking the vents down in the area you want the most cold air to fall in and removing every other rib so you get more air flow. While you have them down take the the vent's holder down also and cut the tube going into the duct so it is even with the bottom of the duct which will also increase air flow. Use reflective silver insulation on windows you don't need to see out of to cut the heat intrusion, make sure you have covered the furnaces return air vents for the summer and check to see if hot air is coming in your vent over the stove. One of our rigs has to have the vent locked on the outside when not in use due to hot air coming in a lot, the other not so much.