In an earth sheltered home there is usually great attention paid to the tightness of construction. This is true for all structures built with energy efficiency in mind. However, the common earth sheltered house has few places to leak air to begin with so ventilation is a high priority. A.A.H.E. are used as a matter of course. The massive amounts of concrete though, may be cause for some concern as to whether an A.A.H.E. provides sufficient protection. The techniques for sealing concrete could take on great significance in both earth sheltered homes and residences with basement living areas.

Whole House Plenums.

Though not mentioned in the E.I.S., this rather rare (in western Wa.) method of hot air distribution does disqualify a home from house tightening measures. The techniques of plastic sheeting and concrete sealing should solve any problems that might arise.

Unventilated Crawl Space.

Most unventilated crawl spaces I encountered as an energy auditor were caused by the owners going to a local hardware store and buying kits packaged and advertised for the express purpose of damming vents to save energy. This does in fact work for a few months to a few years. Then the dry rot sets in and the structure eventually needs major repairs including installation of proper venting. The sale of material for blocking vents should be banned, and a public education program should be instituted to let people know why vents are necessary. I think leaflets and/or posters prominently displayed in the offending merchant's stores would be an effective and low cost start. The current requirements for vents and ground cover are adequate.

Well Water

Water could be pumped into a storage tank that would allow the