Uh, no, homes should not be airtight. You'd have a hard time closing exterior doors if they were, and anyways, houses need to be able to "breathe" to be able t

Uh, no, homes should not be airtight. You'd have a hard time closing exterior doors if they were, and anyways, houses need to be able to "breathe" to be able to keep humidity down (you don't want mold problems), oxygen up, CO2 down, etc.