[ebrewste]

You want to control your ventilation. Making a loose house just means you get ventilation, but not on your terms. HRV/ervs in a tight house allows you to ventilate your house, how you want, where you want. A loose house might be ventilating your house through insulation filled with dust and rat poop. You will never know.

[aidenn0]

I can see daylight between my ceiling and exterior walls, so I know where the air cubes from in my house...

[mypalmike]

In an old house, you will know about the rat poop by the smell after you turn on that new AC unit.