You beat me to it, Island girl! I saw your post on the other thread and copied it to send it over here! Fantastic concept! Makes me itch to build an other house... or convert this one to off grid, heated by solar, compost. There's also some interesting literature out there about bypassing the whole septic system issue by using a big bin populated by red worms. Now, if one were to combine that alternative to the septic system with heat recovery for domestic hot water, or to heat the home, that would be a win/win system. There are so many options for energy conservation that are not being developed or used... and sometimes my cynical mind wonders WHY??? If I had money, I'd build a high tech green house, heated with compost, using aquaculture, with an enclosed area for poultry and possibly rabbits. This section would need excellent air filtration to keep the feather dander from infiltrating the cleaner side where fish and plants reside. All would be accessible to house without having to go outside and dealing with the nasty snow!! Can you imagine having such a "grocery store under glass"? If managed correctly, it would be a self contained bio-loop, while providing energy for heat, and food for the table.