Air conditioning is the killer with us.
My wife does not do a paid job so is at home most of the time. With this last Brissie summer,- PHEW - it was hot, so split system in kitchen on all day and bedroom on all night. My quarterly was over $800, and the prospect next year of another 10%. The government funded insulation made not a scrap of difference (as I knew it wouldn't)
AAAAGGGGGGHHHHHH