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Most standard residential service is single phase. Therefore, I would say most all residential A/C units are single phase.
If it is the original refrigerant, it's R-12 (which is not longer available). If it was converted, it has R-134A. You can tell by the type of service port (the fitting for replacing the refrigerant). The service port for R-12 has threads, R 134A does not.
No, not unless you have the proper equipment to recharge the system and/or dispose of the old AC refrigerant.
Through different air conditioning websites. Contact your local service providers.
The only way to know if Freon (refrigerant) is needed in an air conditioner is to use tools and gauges to measure the performance of the system. The amount of refrigerant needed is based on the design of the entire system including the size of the unit, length and size of the refrigerant lines, temperatures, and type of refrigerant. Refrigerant is not consumed. If refrigerant is needed then the system was either not charged correctly when installed or there is a leak. There could be many reasons a system is not cooling. The correct answer to the question is: A skilled service technician will determined that the system was low on refrigerant by using pressure gauges, thermometers and other tools. There not function a home owner can perform to see if refrigerant is needed.
R134A refrigerant has to be an exact measurement. Unless you have the proper equipment then it is advisable to have a certified repair shop service the unit for you.
You would find R-22 or R-410 a
If you do not know then it would be best for a professional to service the system.If you were to hook up backwards you could possibly get hurt. If you were to service it and you did not use the proper refrigerant or one with stop leak, then I doubt you will find a shop to service it.
75% of US has Residential Phone Service.
No you cannot boost or get more cooling out of an air conditioner in a vehicle. Suggest you take it to a service/repair shop and see if it is low on Refrigerant or have another problem....but you cannot boost an air conditioning compressor's performance.
Verizon offers great Residential Phone Service in Boston
Yes, there are people that will service an air conditioner and will fix the air conditioner if the air conditioner is broken. The local Sears store in your community has this service available.