I am doing the same thing but specifically to pump fresh air into our equipment room about 130 sqf. I am choosing to filter this small zone using and 67 cfm fantech HRV 704 not designed for a large whole house application.
I think it will do around 1100 sqf, might want to look one up to be sure.
Hope this helps
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this is just one place that has them, I just typed in fantech HRV704 and looked for pricing options
http://www.electricsuppliesonline.com/favhsucolowm.html