http://www.popularmechanics.com/home/interior-projects/how-to/a149/1275121/

What you need is an HRV, Heat recovery ventilator. It allows fresh air into the house without losing the heat. It should be set up for make up air as well so your vents (dryer, kitchen, bath) work properly. I am wondering if you have problems with these vents working right now.

hrv for cold climates erv for hot humid climates.

it matters what your location is.

adding fresh air or make up air is easy.

how much to add, is the question.

was a blower door test performed on the house?

what were the air changes per hour?

using the blower door numbers, & volume of

the house, ach is calculated.

once amount of air required is determined

then you make choices of how to do it.

La. for instance is hot humid climate.

an energy recovery ventilator will cost

you approx $1200 installed.

but a better choice is a whole house dehumidifier

with fresh air intake. for a few hundred more.

there are other methods of adding fresh air

like barometric dampers etc. some work very well.

you'd do best to find out how tight the house is.

and go from there.

best of luck

Thank you!!!