haha, I will let you know in about a month, we are starting a 1000 rat colony and I will be using air exchangers in the room, I will only run it for a week or so because we are in CA and I just want to exchange air with cooler outside air in the winter. In the summer will be the real test when its 100 degrees out side and 69-72 inside then is when you do not want to lose your cool air and most air exchangers are very efective. The air outside gets cooled by the cool air getting sucked out of the sealed room and by the time its done there is about a 2 degree differance so 100 degree air will be 73 coming in and 72 degree air will be 97 going out. We allways called it a heat and air exchanger. It is so cool when you walk in a house that is sealed like a ice chest and the air is so fresh inside and no mold problems and heat or cooling cost increase. A good one will exchange all the air in a 4000 sf home in a couple of hours.
I will try to rember to make a post about it this summer.
here is a good example of a fluid heat exchanger and it works the same with air.

http://en.wikipedia.org/wiki/Heat_exchanger

another example

http://us.tranterphe.com/phe/superchanger/super.htm

Some have filters which might be a pain.
http://venmar.ca/upload/384847372/ProdSheet_HRV2500-v1.pdf

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