Here is a full list of tips that can help you reduce that pesky recurring utility bill that haunts you every month:
1) Replace your incandescent lamps with fluorescent. The latter emits much lesser heat for the same brightness and hence will drastically cut your electric consumption.
2) Always go for an inverter air conditioner as it tunes and adapt to the room temperature and works more efficiently when the room reaches the temp target.
3) Once the air conditioner has cooled the room, switch to fan mode. Fan mode consumed 30x lesser energy than air conditioning.
4) Clean your air conditioner air filters every month, the dirtier they are, the harder they will work which equates to more electricity comsumption.
5) Always close the door when you turn the air conditioner on. The smaller the cooling parameter, the less strenuos it should work. Which indirectly equates to lesser energy ......