Panasonic CU-W28BKP5 Mode D'emploi page 16

Operation Hints
Adjust room temperature properly. Set the
temperature 1°C higher (Cooling Operation) or
2°C lower (Heating Operation) than actually
desired. Approximately 10% of electricity costs
can be saved.
Prevent wastage with the Timer. Use Timer
when sleeping or going out to save electricity
cost.
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Clean the air filter regularly. Blockage in the air
filter reduces the airflow and lowers the cooling
or heating. Clean at least once every 2 weeks.
Otherwise, about 6% of electricity cost will be
wasted.
Do not block the air outlet vents at outdoor unit.
Otherwise, it will lower the cooling or heating
performance.