Central AC units are normally hardwired into the electrical system. Home air conditioners are offered in two styles: a whole home central AC unit that is often combined with a central heating system, and window units designed to cool off individual rooms. The two types of appliances require different electrical voltages to work properly. Even a small air conditioner can put a strain on a home electrical system. Central Air Conditioners Central air conditioners require a 220-volt or 240-volt, dedicated circuit for operation. When a central air conditioner starts up, it may require up to 5,000 watts of electricity, making it one of the largest consumers of electric power in the home. An air conditioner's cooling capacity is measured either in British thermal units (BTUs) or in "tons." The greater the number of BTUs or tons, the greater the cooling power of the unit. A larger unit also requires more electrical power. Buying a unit too large for your home wastes electricity, and causes the unit to wear out faster.

Window Air Conditioners Window air conditioners are offered in either 110/120-volt or 220/240-volt models, depending upon their cooling capacity. A unit designed for cooling one small room such as a bedroom normally provides 15,000 BTUs and often works on a smaller, standard 110/120-volt wall outlet. Because of its large power consumption, you should not have any other appliance on the circuit to avoid an overload. A window unit larger than 15,000 BTUs may require a 220/240 dedicated circuit. Adding Circuits Many homes do not have 220/240-volt circuits as standard equipment in living spaces, and they must be added by a qualified electrician. This can cost between $500 to $1,500 as of the date of publication, depending on the type of home and its location and the work that must be done, according to Bill Ferrera of Ferrera Electric in San Francisco. All window air conditioners provide the necessary information about the electrical requirements on the unit packaging. As with a central unit, buying a window unit that is too large wastes energy and money.

Sizing a Unit The specifications listed for individual air conditioner units state the size of the area they cool. portable rv ac unitsFor example, an AC unit that cools a 120-square-foot area would work best in rooms that are 10 feet wide and 12 feet across. window ac unit not leaking waterBy matching your room or home size with the unit's specifications you can select the appropriate size air conditioner. air conditioning unit will not stop runningOther factors you might consider are the number of windows and amount of insulation. If more heat comes through the windows, you will need a larger unit. A poorly insulated home will allow cool air to escape faster and might require a larger window unit. A trained technician can help you determine the proper central AC unit for your needs.

References Sylvane: 5 Things To Consider When Buying A Window Air ConditionerDon Rowe: How Many Watts Do You Need?Popular Mechanics: Buying A Central Air Conditioning System Photo Credits Jupiterimages/Comstock/Getty Images Suggest a CorrectionWritten There is enough material on the need of a Voltage stabilizer / Regulator from the other answers.Stabilizers have a defined operating voltage range lets say 160 Volts to 290 Volts, however the consistent low voltage areas are never within the 160 volts or higher for the stabilizer to be of any help.What I have seen from experience is severe and consistent low voltage happens in areas where the Electric distribution grid is over loaded to its capacity and most likely a single phase distribution to households.This is where the catch is, "Single Phase distribution to households and hence an overloaded Phase".Visit your Electricity board office and upgrade to a 3 Phase Supply, pay if you must for the new cable laying charges for your area. Thereafter use the Phase that is not commonly used in your area.

If you already have a 3 Phase supply then you should change the phase supplying power to the AC to a not so overloaded one.If you still cannot solve the low voltage problem. Prepare to camp at the electricity office and demand for Low Voltage correction in your area, treating it as a Long Pilgrimage visit.Written Written In your case AC will not work perfectly until you will install a 415/230 volt Step down stabilizer. for it you have to take 2-phase supply voltage from transformer.because your single phase voltage is not enough to run your compressor.Written You can have 2 things doneInstall a voltage stabiliser with AC that has a good step-up ratio and tolerance. It must be able to step-up voltage from 130 to 220 volts. This will cost you a good amount but yes this is only that can help you.The above option will provide best solution for ur AC problem.But considering your liw vvoltage prob, I will suggest you to install a heavy voltage regulator on your house mains supply. It will provide a safety measure for your electrical devices in home or office.

Window Air Conditioner Buying Guide imageAlthough many homes have central air conditioning systems, there are still plenty of older homes that don t. Even if a house has central air conditioning, its occupants may decide to try window air conditioners...Read More about Window Air Conditioner Buying Guide Frigidaire 11,000-BTU 500-sq ft 115-Volt Window Air Conditioner Item # 625646 Model # FFRH11L2R1 for pricing and availability. Room Size Cooling Capacity (Sq. Feet) Get 5% OFF Every Day or Special FinancingSubject to credit approval Cools rooms up to 500 sq ft and provides supplemental heat when needed Remote control allows you to precisely control the temperature and fan speed from across the room Electronic controls allow you to set the comfort level to your preference, while a convenient temperature readout displays the set temperature Unit features 3 different fan speeds for more cooling flexibility Sleep mode: quiet operation keeps you cool without keeping you awake, and gradually increases room temperature after being activated