The latest post on this topic by Beetle is:
![Beetle](https://www.homeone.com.au/img/avatar_h1_25x25.png)
Yes it sounds like a similar or the same system as 'earth tubes'. Apparently the cooling unit itself costs about the same as an evap aircon. and will be formally released in Nov. Not sure if it is the same system as the one you mention but we should have more details soon. The echoarchitect told us it releases dry cool air into the house through pipes that vent into the rooms.
I am not sure how long the pipes are, but I know we need a 120 mm slab with entry points into the house, & the tubes sit under the slab (
![Question :?:](./images/smilies/icon_question.gif)
We hope to have hydronic heating and currently have the solar panel & apricus system as part of our spec. The windows will be a combination of double glazed and comfort plus (larger panes of glass).
I will post our plan once we get it back with all the mod cons from the architect/builder.
Hope above is clearer than mud
![Smile :)](./images/smilies/icon_smile.gif)