Project involves what process ?

Usually in one day a home can be properly Air-Sealed. We look for all areas of possible leakage, then seal with various sealants , usually with a silicone base for better weatherization and longevity.

This is common sense weatherizing. The house leaks, SEAL IT UP!

Other than some obvious cosmetic changes with areas caulked and sealed, there is no concern for house being "too tight". Such is a common heard false idea.Properly ventilated homes do not cause heat loss. And Proper "controlled ventilation: will reduce moisture problems. BOTH  air-sealing and proper ventilation are needed to promote home's full functioning systems.