Sydney's cooling demand is uneven across one metro. Coastal suburbs get a sea breeze, while Penrith, Blacktown and the Hills swelter several degrees hotter, and a heatwave pushes calls from the west first.
Newer estates are built with ducted systems, apartments rely on split systems that often need owners corporation approval for an outdoor unit, and older houses are fitted with whatever the last owner could afford.
Reverse-cycle units also heat in mild winters, so servicing has a second season. Anyone handling refrigerant needs an ARC licence, and wiring is licensed electrical work, so customers who ask for credentials are asking the right question.
Power cuts during hot spells add their own callouts.