Got to say, I'm pretty impressed with how our house goes in the heat. On any of the warmer days, say 30+, the temperature inside will sit anywhere between 4-6 degrees lower on average. But on the really hot days, like yesterday when it reached 40, at one point we were 11.5 degrees cooler inside than it was outside.
On many of the hot days I'll actually leave two or three windows open around an inch. The house heats up a little more than it would, naturally, but it helps drop the internal humidity down by a fair whack, stopping the house from feeling as muggy.
In other news, our first power bill was $60. Given that we haven't had the solar panels up all that long, that's not too bad. Bill would have been about $330 without. That said, $30 of of bill was GST. Yes, they charged us GST on the full amount of the bill, then took off the money from the power buyback. I thought that was a bit cheeky.
As far as I can tell, our power usage appears to be about 75-80% the NSW average. Not too bad, and that's before we've swapped out lights for lower power ones. Mind you, beyond that I'm not sure how much more we can do. Most of the equipment is turned off at the power point, and is usually only on when it's being used. That said, I do want to get the stove top shifted over to gas, and at some point we may look into solar for water heating. We currently have electric water heating but the unit can be converted to work with solar as well.
Given the way power costs are going up in NSW, may well look at building a shed to house batteries, and getting additional panels set up to take us off the grid. But that'd be a fair way off, for all sorts of reasons.
Will be interested to see how our power bills look in the winter. Less sunlight, more lights on. Hopefully the fire will save us some cash, and the house will continue to show how good its insulation is.