Dan, I also live in a modular/mobile, {whatever a mobile is, I,m not sure}. If newer like mine, they are very well insulated and require good air exchange. I have a good whole house exchanger but certainly not efficient like the HRV units, {the only way to go}, I had in my houses.
If you notice most my recent build threads relate to this and part of the current reason I now have a small aquarium, is to keep evaporation problems to a minimum and still enjoy the hobby.
Ours was a disply when we purchased it otherwise it would have been ordered with an HRV installed. That being said, I think its hard to put one in after market, asone has not access to run vents, etc, without removing the complete underbelly insulation and protection.
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Doug
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