Weather very hot in Singapore. How to keep cool but save money on air conditioning especially at night?

Shower with cold water before you sleep. Try to increase ventilation. Maybe can try a dehumidifier.

Buy something like broadlink smart controller. I set to off air con at 4pm and on the fan at 4.01pm.

I turn on the aircon during sleeping time strictly between 7 to 8 hours nightly. You can't really save much of aircon at night but you save electricity by working in office or go out to malls during the day.

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For me i dont do the following:

• if set timer, you may disrupt your sleep if temp becomes warm.
• if sleep naked, your bedsheet will be dirty due to body sweat and oil.
• if increase temp, the compressor may keep start and stop through the night.

One trick i read before, you can try a slightly higher temp and turn on the fan but have not personally tried and monitor the electricity usage.

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Set timer