Air conditioners constitute the major component in electricity bills. The latest and the most efficient technology that is available in market today is the Inverter Technology for air conditioners which can save 30-50% of electricity (units consumed) over a regular air conditioner. Inverter air conditioners are variable speed/ variable tonnage air conditioners and operate in different manner as compared to regular air conditioner models which are equipped with single speed compressors and single tonnage. Unlike normal acs, Inverter ACs can adjust their speed/tonnage depending upon the room temperature. A 5 star  lloyd inverter ac will consume around 30-40% less electricity than a non-inverter ac.
When an inverter AC is switched on, the compressor starts slowly and gradually increases its speed till it reaches a desired temperature which results in faster cooling of the room. Once the preset temperature is reached, then the compressor slows down and maintains that speed to maintain the set temperature of the room. A 4 or 5 star rated 1 ton Hitachi AC price of around 30K will consume approximately 1.25 units  electricity in an hour whereas one ton inverter ac will consume about 0.75 units of power (which is around 40% less). Hence, if you are running your air-conditioner for 8 hours in a day then you will save around 4-5 units per day for a 1 ton inverter ac. They also produce very minimal sound as the compressor keeps on working at low power and does not turn on and off all the time.
The popular air conditioner brands are :
  1. Hitachi : Hitachi is a Japanese company delivering high quality products at affordable prices to the users. Their split and window units are energy efficient and are equipped with features like auto climate technology, silent cooling features, air swing, anti-bacterial Koukin filter, filter clean indicator, Auto restart and Auto power saving mode.
2. Daikin : Daikin is a Japanese air conditioner brand which is quite renowned and popular due to its high-quality products and affordable rates. With reasonable Daikin AC price starting from Rs 27,000 to Rs 75,000, this Japanese brand have become the people's favourite brand. The popular series in air-conditioner segment are FTXR Series,  FTXG Series, DTKM Series and ATKM Series. They are highly suitable for adverse and fluctuating weather conditions.
3. Voltas : Voltas is a trusted brand and their models are known for their great performance, high efficiency and durability. Voltas air conditioner prices are quite affordable starting from Rs 27,000 till Rs 60,000. Their popular range of series include All Weather AC, Voltas Jade (Y series), Zenith (Ya series), Classic (Yu series) and Magna (Y series).  Buy the best Voltas AC unit to beat the hot summer season. The features included in their models are Anti-Dust Filter and Acaro Bacterium Filter, Active Carbon & Swing Mode, Hydrophilic Aluminum fin and LED display.
Before making a right selection, it is most important thing to look at the model and it’s energy efficiency. Secondly, analyse your usage and your electricity tarif. If you are in a metropolitan city like Mumbai, delhi or Bangalore where the tariff is high, even a moderate usage of AC will be favouring the inverter technology for Acs with better efficiency. But if you are in place like Goa or Chandigarh where tariffs are very low, even high usage does not justify buying highly priced inverter ACs. Usually for average tariffs (average across India) and a usage above 1200–1500 hrs, Inverter AC is better. However, Inverter AC is not advisable in case of less AC usage.