We have a few years before we have to do this but it might be useful to start collecting ideas now. My list is:
- Solar hot water.
- Solar electricity with smart meter.
- Possibly double brick with some cavity insulation.
- Something better than a few batts in the roof.
- Floor insulation, often neglected but can help.
- Glazing, have read that they now have triple glazing in some countries.
- Plenty of huge water tanks possibly underground to provide water for showers, toilets, maybe even everything with suitable filtration; they need some kind of mosquito protection.
- Storage heaters connected to the solar electric power in winter.
- Air conditioning connected to solar electric power, it would only be needed when the sun is shining, ceiling fans for really hot evenings.
- Efficient irrigation system from the water tanks.
That's my initial list, can anyone add to it?