@solarventi, Hi, sorry, I didnt work it correctly, It is an interesting concept, but I am not getting it>>> bit slow... How do you heat up in winter in Vic when we get very little sun and the weather has turned Artic this year, Main reason I am noticing the cold, especially when working outside. I do have low blood pressure so feel the cold, but the red clothing next to skin works a charm. I would like to understand... I have seen on uTube where they DIY passive heat I liked the pictures but no explanation and these were using exisiting windows .. I this with gap at bottom on outside so cold air comes in and gap at top on inside so warm air into house.... but got to technical for me. And I get confused, as hot air rises and I dont understand why fans are at the top in newer models not at bottom [of heaters] But I would mind understanding how it works.. Am going to check the website, TU very much. I have bats to put in kitchen reno but would like something to attach to the corrogated iron so there is no gap between iron and bats. Appreciate your help and will check again on your site to see if I missed anything :)

After I had finished my Archi Masters I was working for an architecture firm who also did a small amount of work for a volume builder. They were actually a pretty good quality builder and at least got the orientation of their 'pre-designed' plans correct. We had the ability to make minor changes to every job and it pained me to see so many simple to implement passive options not being incorporated. Had most of their clients known that they would be saving MONEY over the longterm by making a few minor changes to suit their site, they all would have done it. The problem is unless someone can sell this idea to them as a financial/lifestyle choice, many just think it is about saving the world. It is a no-brainer if you have in interest in it, but for those who don't know, there is no-one there selling it to them, especially on the lower end of the market.

As said above high ceilings and windows can have issues such as those raised. If this is the only way to get north light in to a living area then you can mitigate some of the heat loss issues using fans which push the hot air back down, or mechanical reticulation systems. High levels windows are great for passive cooling, but unless the warmth of the sunlight can be absorbed by some thermal mass then your not likely to get a huge heating benefit. Alternative design layout which get north light into living areas in a more conventional manner would be more practical and cost effective if you can achieve that.

consider very dark walls like navy, dark grey, rich caramel or deep rust colours with eaves and fascias white, downpipes same as walls and gutters a mid range colour to match the dark walls (btw some new paints are supposed to have heat reflecting qualities even in the darker colours)