How do I make my heat pump / air conditioner more energy efficient?

Set appropriate temperature setpoints: setting a slightly lower temperature (1-2°C lower) on heating mode during winter compared to your summer setpoint, and a higher temperature setting on cooling mode during summer (1-2°C higher) relative to your preferred heating setpoint can reduce energy consumption. 

The use of timers to schedule the operation of the heat pump / air conditioner can assist in running your unit efficiently.  For example, using the sleep timer when going to bed, or using the on/off and 7 day timers to allow the system to start running in the morning a few hours before you get up, and to ensure the unit turns off when you go to work.