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Yes, call a certified technician to do the replacement of the freon.
900
600 square feet.
4000btu
The general rule is 600 sq.ft. per ton of refrigeration, so an 18000 BTU A/C will cool approx. 900 sq.ft. . There are many variables, such as insulation R value, normal summer climate in your area, age of the structure, etc., so this is just a guide. To know for sure, have a heat load calculation done.
5280 maximum
1500 sq ft.
Yes, a 4.5 ton air conditioner would be the minimum size for 2000 square feet.
around 400 SF, not ft
3 ton
The Amps means the volume of flow of electricity. The Amps depends on its BTU (British Thermal Unit). BTU is the unit to measure the energy that is consumed to perform some Air Conditioner. 12000 BTU Air conditioners uses 5 to 6 Amps. 18000 BTU Air conditioners uses 9 to 10 Amps. 12000 BTU air conditioners also called 1 Ton AIR CONDITIONER and 18000 BTU Air conditioners are called 1.5 Ton and so on. The 2 Ton or 24000 BTU Air conditioners use 15 Amps to work.
The air density at 18,000 feet above sea level is approximately 0.65 kg/m^3. At higher altitudes, the air density decreases due to the lower pressure and lower temperature.