Knowledge Base


With the many types of air conditioning systems available on the market—central, split, window, unitary, PTAC, portable, ductless and so on—it is easy to get confused with air conditioners and their terminology. Also, different systems have different installation methods, maintenance guidelines, energy ratings and advantages. Here are 5 things to know about air conditioners.



Types of ACs:

Window ACs are the most popular air conditioners and can fit most windows with some support. Then there are portable air conditioners that can be used anywhere in the house to cool specific areas. Portable air conditioners do not need permanent installation. Portable air conditioners support central HVAC systems. For permanent operation, built-in air conditioners are best. They are versatile with both cold and hot air operation.
Split ACs or ductless ACs are technically known as PTAC. They are more popular in offices, apartments and hotels. A split AC splits into two units—an exterior condensing unit and an interior evaporative unit—with a refrigerant tubing passing through the wall to connect both terminal units. Central air conditioners are perfect for home as they are high performance and have noise free operation.

  Cooling Capacity:

When it comes to air conditioners, size matters. The size of an air conditioner depends on the size of the room you want it to cool. An AC that is too small for a room won’t cool the area properly, while one that is too big will make the room cold and sticky.
Cooling capacity is measured in British Thermal Units or BTUs. Calculate your room size in square feet and use a BTU calculator to determine the ideal BTU for your room size. High ceilings, crowded rooms and sunlight can increase the BTU requirement for your space.

  Energy Efficiency:

While all types of air conditioners have more or less the same purpose and functioning, energy savings can vary from one model to another. EER number and Energy Star rating determine an air conditioner’s energy efficiency. If you want an air conditioner than consumes less energy and gives better energy output, look for a system with Energy Star rating. Energy Efficiency Ratio or EER is a measurement of the BTUs an AC consumes for each watt of power. So the higher the EER number, the more energy efficiency you get from an AC.

  Electrical Requirements:

Check an air conditioner’s specifications for electrical requirements and make sure your electrical system meets its needs. You will need to check the amperage available, voltage requirements as well as make sure that the outlet is within the reach of the line cord.
Room air conditioners generally work on 115-, 125- or 220-volt circuits. ACs with cooling capacities below 15,000 BTUs operate on 115- to 125-volt circuits. ACs with cooling capacities above 15,000 BTUs operate on 220-volt circuits. You might need to get special electrical wiring if your current system does not meet the AC’s electrical requirements.


Also Read: How to pick the perfect Split Air Conditioner and Keep Calm?

Installation and Maintenance:


Window ACs are the easiest to install and remove. Portable air conditioners can be mount on casters and move them anytime—no permanent installation required. Built-in ACs have a more complex installation—wall units provide location flexibility but larger units need professional installation.


Some general maintenance steps for air conditioners include cleaning filters periodically. For window ACs, a foam weather strips needs to be installed around the unit. If you don’t intend to use your window AC during winter, store it away. Thorough cleaning is required on an annual basis.
These were the top 5 things you need to know about air conditioning systems. However, if you plan to buy one, consider not just the types of ACs, BTUs or Energy Rating stars, but also features based on your personal preferences such as noise level, fan speeds, sleep settings etc.


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Well renowned for their cooling purposes, Hitachi AC’s boast of a great cooling rate. These AC’s are equipped with a Twin Turbo Technology which augments heat exchange at high temperatures and maintains maximum cooling without overloading the machine capacity. Moreover, the Twin Turbo Technology is designed to dispense air in both directions and provide higher air-flow at lower RPM, as opposed to traditional AC’s with Sirocco fans on the inside and propeller fans on the outside, which are unable to dispense air in both directions, thus resulting in lower efficiency. Traditional AC’s have a large number of blades, resulting in higher air cutting noise and higher noise levels, which further translates into decreased efficiency. In comparison, Hitachi AC’s come with lesser number of blades, resulting in lower air cutting and better cooling. Furthermore, on account of the Turbo fans both on the inside and outside, the overall air-flow is escalated, thus providing superior efficiency even at lower noise levels.


With a front frame made from high quality plastic, Hitachi AC’s boast of a remarkable build quality. The front frame is unique and bears the company design. With an overall fine finishing, Hitachi AC’s are unrivalled in terms of durability of a classy appearance.


Along with quality, Hitachi AC’s are also unparalleled when it comes to styling and looks. Hitachi window AC’s come with diverse product ranges like Summer QC, Summer TM and Kaze. The Summer QC and Summer TM ranges are the flag bearers for Hitachi in the looks department. Their design consists of air blowers on two sides with a coil grill in middle, giving them a scintillating appearance. The Kaze range has a basic design with lesser features and is more cost efficient when compared to the Summer QC and Summer TM ranges.




Twin Motor Technology
In traditional AC’s, both the indoor and outdoor fans function on a single motor, thus, a reduction in the inner fan speed reduces the outer fan speed as well, which in turn reduces the AC’s ability to dispense hot air outside, diminishing its overall efficiency. However, Hitachi AC’s are equipped with two independent fan motors, one each for the inner and outer fans. Since both of these fan motors are independent of each other, the AC’s ability to dispense hot air outside as well as its overall performance remains unaffected. It should be noted that this feature is available only in the Summer TM model.


Auto Climate Technology
Regular AC’s can be adjusted to different temperatures and humidity levels in diverse surroundings by regulating their in-built temperature mode and fan speed. However, setting the temperature and fan speed at varied temperatures with inconsistent weather and humidity levels, can become excruciatingly difficult. But this problem can be resolved by opting for a Hitachi AC, as it is equipped with a superior, advanced intelligent feature that is pre-fed with temperature and humidity data from over 100 cities. Hitachi AC’s automatically detect the city you reside in, the time, and individual metabolic needs chosen by you like, hot, very hot and humid. Based on the aforementioned factors, these AC’s frequently change their settings accordingly, to maintain a comfortable environment, while functioning smoothly at the touch of a button. This feature is available in every model.


Prevent your AC from being misused in your absence by your kids or anybody else, by turning on the Digilock facility, which will keep your AC locked without hindering your comfort settings. This feature is available in the Summer TM & Summer QC models.


Alarm Function
Hitachi AC’s come with an in-built alarm to wake you up on time. Moreover, this alarm automatically turns itself off at any desired time you wish to set. This feature is available in the Summer TM & Summer QC models.


Supercool Function
When turned on, the supercool function sets the AC to work at its optimum level, thus maximizing cooling within a short time frame. This function is available in auto and cool modes. This feature is available in the Summer TM & Summer QC models.


Koukin Filter
This exclusive anti-bacterial filter averts the growth of bacteria inside the Air Conditioner and guarantees optimal performance of your AC always. This feature is available in every model.


On/Off Timer with Advanced Start-Up
With this AC, it is possible to set a particular temperature at a particular time every day. Thus, if you choose the temperature to be 24° C at 09:00 PM when you return home from work, this AC is so innovative that it will scan the room at 08:00 PM as per your need, and will calculate the time required to reach the desired temperature and switch itself on accordingly. After achieving the desired temperature, it switches itself off, thus conserving electricity, and providing you with a comfortable atmosphere once you reach home. This feature is available in every model.


Extra Heat Exchanger (XHE)
As opposed to most window AC’s which are air-cooled, Hitachi AC’s are equipped with an extra Heat Exchanger function that is attached to its coil, which is cooled by the condensed water. It is well known that water cooling is undeniably better than air cooling and hence, the Heat Exchanger function automatically increases the Air Conditioner’s ability to dispense hot air outside, thus allowing it to perform efficiently even at incredibly high ambient temperatures. This feature is available in the Summer TM & Summer QC models.


When we run an AC the entire night, it achieves an even lower temperature than required, thus making the room more chilly than desired. In order to negate this drawback, Hitachi AC’s are equipped with a distinctive feature known as Kaimin, which cleverly increases the temperature just by 1° C per hour for up to 4 hours, thus providing you with a good night’s rest. Moreover, this feature assists in maintaining the desired room temperature and also helps in saving energy. This feature is available in every model.


Filter Clean Indicator
This unique indicator reminds you when it is time to clean the filter through LED on the indoor units. This feature is available in every model.


Hitachi is the only company which provides a myriad of features in their AC’s. Some of their truly unique features are unrivalled by other companies currently operating in India. If the above features have impressed you, then you should hesitate no further in purchasing the Hitachi TM-RAT222HSD. While taking the product life into account, there is definitely no competition for a Hitachi AC.



Split AC has lately become very popular among people due to its variant sizes and the noiseless performance they give. They are mostly preferred by middle class homes as they provide flexibility in mounting locations. The cheapest split AC models can be found in the market for those who find Air Conditioner’s very expensive. These sleek designed ACs can be purchased by considering the size of the room and the number of people sharing it. Apart from the usual electronics stores, you can also buy split AC online. It is essential to select the split AC specifications correctly to get the perfect AC that would match your room. We have highlighted some of the points here that will help you to buy a split AC.


Budget is a very important point to be considered prior to buying a split AC. The cost of split AC has gone down significantly in these past few years. Nowadays, split Air Conditioners are priced between 12,000 INR and 2,75,000 INR. Apart from this, there are other factors like the AC size and the tonnage capacity of the AC which can affect the price.


Types of Split ACs
Depending on the room you are going to install the split AC in, there are at least three main types of ACs that you can choose from. The first is the wall mounted type that is generally used in smaller sized rooms that have open ducts. The floor mounted or tower or vertical split Air Conditioner is used when there is absolutely no place to install the regular AC. Another split AC type is the ceiling mounted Air Conditioner that helps in cooling the room uniformly. Apart from this, you can also buy a multi-splits AC which has two indoor units and one outdoor unit.


Cooling Capacity
You need to decide the cooling capacity or the tonnage of the split AC based on many factors that includes the outside environment, room size, sun exposure etc. If you stay in a place where the outside temperature is quite high then you need to get a split AC that has more cooling capacity. The same applies when your room is exposed to sunlight and even when your room is near to your kitchen. The area of the room is proportional to the AC’s cooling capacity so get an Air Conditioner that suits your room size. Also like room size, make sure that the split Air Conditioner is proportional to the number of people who will be occupying the room.


Thus we have so far learnt that after the primary importance which is usually given to budget, other factors such as keeping information about the types of Split AC’s, knowing your coverage area at the place you wish to incorporate the Air Conditioner, deciding on technical aspects of the air conditioner like the cooling capacity are also of utmost importance.





 Certain spaces in our homes are missed by the inefficient and ancient central air conditioning systems and hence don’t offer proper cooling in our homes. Areas like bedrooms, offices, garages, and server rooms are usually warmer than the desired temperature due to improper ventilation or air circulation. All this can be avoided and rectified if you buy a portable air conditioner. Portable ACs are small and easily moveable cooling appliances that can quickly and adequately cool desired areas in your home, office or any interior place of your choice.


Deploying a portable AC for cooling specific spots can help you in your savings as overall cooling cost comes down. Just ensure that the thermostat is set at a few degrees higher and see the portable AC achieve the target.



This post will act as a buying and information guide to inculcate a better understanding of portable ACs and will let you make the proper decision with regards to buying the best portable AC that fits your specific requirements.


What exactly is a Portable AC?
A portable AC is a small and compact cooling equipment which can be moved unlike a fixed AC to any part of your house, office or any interior place for cooling specific spots. Although a portable AC doesn’t require permanent installation, it still requires a window for exhaust. Portable ACs have self dehumidification property as they cool.

Portable Air Conditioners are available in different types and sizes and made by various brands.


Pros of a Portable AC
As portable ACs don’t require permanent installation, you are free and flexible to use just a single AC for all your rooms in your house at a time thereby eliminating the need to buy multiple units and hence it is light on pocket plus you save on installation costs. You can also move a portable air conditioner across various locations easily.


Easy Exhaust

All cooling equipments give out exhaust or hot air and portable air conditioner is no exception. This exhaust is generally vented out of the cooling area with the help of an exhaust hose through windows, sliding glass doors, walls, and ceiling. Most portable air conditioner manufacturers include window kits or drop ceiling panel kits which take care of the exhaust.


Effortless Maintenance
Maintaining your portable air conditioner is a very simple affair and is effortless. Once you setup a portable AC unit, you just need to forget it. However, don’t forget some the basic upkeep of the AC like cleaning air filters, proper installation, and defrosting in case of ice buildup in the coils.


We have provided you with all the information you need for selecting a portable air conditioner of your choice and proved that a portable AC is an economical cooling device. You can look for a portable air conditioner online for easy comparison of models and prices.