Oh, I forgot: I haven't yet had the pleasure to see wiring done by HVAC guys first hand since air condition is hardly ever used in residential construction here (some hysteric people have window-ac units installed, but they're not appreciated very much (neither the people beacause they just can't stand a nice warm summer nor the window units because they look awful from outside). Plumbers are just far more common here, as hot water central heating has been first choice since the 1930ies or even earlier and probably will remain (along with lots of gas, wood and oil space heaters in old houses).
