[Exeric]

I did a mental simulation of using a dedicated isolated laundry room with warm incoming air to the whole room used for the dryer. It won't work as I was thinking. When a person would open the laundry room door up to a 135 F or more heat would hit you and would then start spreading throughout the house. That would completely negate the idea of isolating the house from excess heat in warmer months. You could get around it at the expense of much complexity, including running the dryer fan for 10 minutes or so after the load is dry, while closing the (now actively operated) ceiling vent. My experience is that added layer of complexity would completely negate the original advantages of having an isolated laundry room.

It seems the choice is either using one of the methods in Daox's link or nothing. Just would have to use a bigger duct so one could get away without a separate blower.