Thanks to my darling mum, we now have ducted reverse cycle air conditioning through the whole house.
After a lot of investigation, I gave Peter a couple of different options and togeether we decided on a system that had the ability to set and maintain a different temperature in each room. It was advetised as having 'no dump zone' which was a big selling point for me as it meant that there wouldn't be a zone that was on constantly even when not required.
The ceiling vents are the same as those used for evaporative air con which surprised me as I thought refrigerative air con needed different outlets. Turns out it doesn't .. learn something new all the time.
The compressor unit was put outside our ensuite window to avoid any of the other bedrooms having to put up with the noise. It's not actually very noisy but we weren't sure and thought better safe than listening to the whingeing!
It's been in for a couple of weeks now and it works well. I'm a bit scared of what the power bills will be like but we'll just have to wait and see. Can't be worse than the first one ... $900+!!
Overall I'd say we're happy with it as it doesn't matter if it's humid or just hot, unlike evaporative which only works well in hot, dry weather.
One of the only things I'm not happy with is that I like to feel a breeze .. it makes me feel cooler .. and this system doesn't push that much air through to make a breeze. It just feels cooler in the room which you notice when you first walk in but after a while, I find I have to turn a fan on to get the air circulating.
The other thing is that although the system was advertised as having 'no dump zone', it actually does have one but they have just called it soemthing different .. pressure relief or something like that. What that means is that the boys's hallway, which never gets hot due to having no direct sunlight and being on the south side of the house, now gets all the 'excess air' produced when the system is trying to cool any other area. This makes it colder than the rest of the house with the boys' rooms being even colder than they should be.
I'm going to try to get the dump zone moved to the front hallway, where it would be better placed but I don't know if they can move it that far from the main unit in the ceiling space and then we'd have to patch the ceiling as well.
On the positive side, at least we have air con!!