AIR-CONDITIONERS 
Energy consumed: A single split-unit air-con consumes about 252kwh a month if used for seven hours every day.
Cost: $60.18 a month
How to save energy:
Consider a multi-split system if you require more than one room to be cooled.
Ensure that the unit is the right capacity to match the amount of cooling required.
Clean the air-con filter regularly and have the unit inspected annually. Poorly maintained equipment can waste a lot of energy.
Set the thermostat at 25 deg C. It is a comfortable temperature for most, yet will not consume that much energy.
REFRIGERATORS
Energy consumed: A 300 litre frost-free unit will consume about 115kwh a month if switched on year round.
Cost: $27.51 a month
How to save energy:
Choose a model with an energy-saver switch which will allow you to determine the setting that provides maximum energy savings without causing condensation.
Adjust the thermostat to the recommended settings.
Allow hot food to cool before putting it in the fridge and cover all food and liquids to prevent moisture from being released. Moisture increases the amount of energy that will be used during the fridge's defrosting cycle.
Do not open the door unnecessarily as the cool air will escape.
WATER HEATERS
Energy consumed: A 1,000 watt instantaneous or tankless unit uses 60kwh if used for a total of two hours daily.
Cost: $14.33 a month
How to save energy:
Use an instantaneous water heater instead of one with a storage tank. The former provides hot water only when needed.
If you prefer a storage water heater, choose one with a capacity of 23 litres to 27 litres, which is enough for a family of four to six. The bigger the capacity, the more energy consumed.
Switch on the storage water heater just 20 minutes before taking a bath. Switch it off after that.
WASHING MACHINES
Energy consumed: A 450 watt unit without heater consumes 13.5kwh if used for an hour each day.
Cost: $3.22 a month
How to save energy:
Wash a full load of laundry each time.
Don't use hot water to wash clothes as heating up the water sucks up more energy. If you must have hot water, using cold water during the rinse cycle will cut energy use by half.
Do not put too much detergent to avoid having to wash or rinse the load again.
Pre-soak or use a soak cycle when washing heavily soiled items to avoid two washings.
TELEVISION SETS
Energy consumed: A 26-inch conventional TV set consumes about 30kwh a month if used for five hours a day.
Cost: $7.16 a month
How to save energy:
When watching television, keep the lights in the room low. This saves electricity and reduces glare from your screen.
Switch off the set when not in use, including the main switch.
Choose a conventional CRT TV set instead of a plasma set. The latter consumes about four times more energy.
Alternatively, choose an LCD set instead of a plasma set as it consumes less energy.
COMPUTERS
Energy consumed: A 300 watt unit - about the maximum power of a 24-inch iMac - consumes about 36kwh a month if used for four hours a day.
Cost: $8.60 a month
How to save energy:
Set the power to automatically go into sleep or stand-by mode after 15 minutes or so of inactivity.
Switch off the computer when not in use for long periods. This applies to the main switch too.
Use liquid crystal display (LCD) monitors as they consume half to two-thirds what cathode-ray tube (CRT) monitors do.
A laptop uses up to 50 per cent less energy than a desktop.
SOURCE: SINGAPORE POWER AND NATIONAL ENVIRONMENT AGENCY