Is a tight house dangerous?

Only if it is improperly designed. To give you a comparison, can you imagine if the drinking water that came out of your faucet came from under your door jams, dirty window sills, off of your garage floor, down from your roof with bird poop on it, without going through any filtration process before you drank it? Your water is filtered and goes through a controlled process before you drink it. Why do you allow the air you breathe to be handled any differently?

Consumers today confuse a tight house with a house that doesn't breathe and thus would get stale and moldy. If the builder doesn't mechanically ventilate the house, then they're right.

Air entering a tight house with a fresh air intake, high off the ground, going through a filtration system and then being forced out of the house mechanically is the key. It removes dust, allergens, and other pollutants before you breathe them. The tight house closes off the passages that allow dirty air in. Just as you wouldn't drink dirty water, you shouldn't breathe dirty air.

Rob Boydstun - Miranda Homes