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usually takes 25mfd or 30mfd for compressor and 3 mfd for fan motor. Depending on what compressor is used I would recommend 30uf rating for the compressor and it should be fine, most compressor will operate within 10 to 15 percent of rating plus or minus with no problems. Also the 3mfd rating is based on OEM motor, if it has been replaced then probably a 5mfd is required.
GE stopped making AC units probably 20 years ago. The same unit will not handle an additional 1000 sq. ft. I believe it is a four ton unit and about a 6 SEER rating which is way down on the efficency scale. You will need a 5 ton system to handle 2950 sq. ft. The average SEER rating now is 13.5.
You should have around 120-125 volts at the outlet. If you have less than 110 volts at that one outlet, you may need to have your house wiring checked. Go ahead and call your local power company and have the power coming into your house checked at their transformer. They should do this at no charge to you.