Air-conditioner

Purchase/Installation
  • Choose the correct size for your air-conditioner. Under or overpowered air-conditioners consume more energy than required. Assess your requirements together with your air-conditioner retailer.
  • Choose an air-conditioner model by using the tick rating system on the energy label. A 1-tick model will cost you about $260 more in electricity bills a year* as compared to using a 3-tick air-conditioner. The more ticks, the more energy efficient the model is
 
*Based on electricity tariff of $20.35 per kWh, assuming a multi-split 7.5kW cooling capacity air-conditioner used 8 hours daily.
 
 
Usage
 
  • Use a fan instead of an air-conditioner to keep cool. Save about $460 a year*.
  • Run the air-conditioner about an hour before bed and switch to a fan after that. Save about $400 a year*.
  • Set the timer of air-conditioner to turn off half an hour earlier than usual. The room will still continue to remain cool for a period of time after it is being turned off. Save about $30 a year*.
  • Set the temperature at about 25°C or higher. For every degree raised, you can save about $15 a year*.
  • Check the air-conditioner air filter once a month and clean or replace it when necessary. Dirty air filters impede airflow and cause energy wastage.
  • Service your air-conditioning units regularly and get it inspected annually. Besides the air filters, the condition of other components of an air-conditioning unit (e.g. refrigerant, pipes and motors) also affects its efficiency.
  • Close curtains or blinds over windows during the hottest part of the day, or use solar window film, especially for west-facing windows, to keep the house cool.
 
*Based on electricity tariff of $0.27 per kWh, assuming a single-split 1-tick, 2.6kW cooling capacity air-conditioner and a 50W electric standing fan where relevant, used 8 hours daily.
 
 
Fun Facts
  Inverter VS   Non-inverter
    Air-conditioners    
Employs electronics that vary the compressor speed to adjust to changes in room temperature.
  The compressors operate at a constant speed, continually switching on and off to adjust to changes in room temperature.
Consumes less energy.   Consumes more energy.


While energy efficient models may have higher purchase prices than less efficient ones, they tend to have lower life cycle costs due to their lower electricity consumption over their lifespan. You can use the Life Cycle Cost Calculator, available in myENV mobile phone application, which you can download from the App Store and Google Play:


or visit the website (http://www.e2singapore.gov.sg/Households/Saving_Energy_At_Home/LCC_Calculator.aspx) to help you make informed purchasing decisions.