Energy efficient windows etc.

We have settled on a renovation design for our 1930's bugallow. We are getting double glazed uPVC sliding doors (2 at W3.3 x H2.4 m) facing north with appropriate sized eaves (1.3 m) in the large kitchen, dining, living area 10 x 5 m. I live in a climate zone 5 area (coastal Adelaide). The glass in the doors will be 4/12/4.
So, I reckon I need a low U-Value window to stop heat transfer into and out of the house, with a high solar heat gain coefficient rating (SHGCw) to allow the winter sun to warm the house (we will keep the summer sun off) and an high e-rating.
The rest of the windows around the house which are much smaller are to be aluminium 2 x glazed which are much cheaper:

1. One north facing ensuite window will require some sort of awning due to small eaves due to existing bungallow design.
2. One bathroom, a toilet window and 2 high level small windows in the living area which are all facing south and get no sun (to be ascertained and remediated if necessary).

What I would like to find out is there anyone in this forum who can tell me other considerations required. The door manufacturuer talked about the internal face of the inside pane needing special treatment and I started to get lost. He showed me a table and it looked like the case. I thought I had done well to get this far and he sort of messed with my head. A case of me having enough knowledge to be a danger to myself but doubt info from the pros.:doh: I have been trawling the WERS site but that is a non-user friendly site from what I could see and I could not find the table.

I would be happy to pay for a independant review if necessary and can provide detailed drawings and etc if required. We have put a bit of effort into reducing the energy usage of the house and want to get this bit right as we intend to rot in this joint.


Read and reply to the full thread at RenovateForum.com....