[4RE KLR]

I do not think you will have to worry about and air to air exchanger. I have found that it is harder to completely seal a pier and beam home up than a traditional slab foundation. Yes it can be done but it is very difficult to do. The older pier and beam homes can be sealed and made to become efficient easily enough. You do not want to completely seal the homes so there is no air movement. This is not healthy for your family or the home. Remember wood needs to be allowed to contract and expand naturally. Most people tend to forget about that when remodeling the home.

Condensation on the windows is a big problem when homes are too tight. If you find you have condensation on the windows you should open the window a bit and let the draft circulate the air, at least for a short time. I too have seem people vent the dryers into the living areas for what they thought would be added heat. I do not recommend this.

I think your biggest problem right now is to correct the electrical issues and then you can fix the insulation during the summer. Besides it will help you on your cooling bill as well.