Yes, call a certified technician to do the replacement of the freon.
No I think you will need an 18000 condenser for an 18000 BTU.
18000 BTU means TON 1.5 ,12000 BTU means 1 TON
It is a 1-1/2 ton: 18000 BTU (unit size)/12,000 BTU (per ton)=1.5
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.
18000 btu or 1.5 tons.
18000btu is 2 hp
Go to your nearest HVAC&R distributor present your EPA Certification card and purchase the refrigerant.
700 to 1000
Perhaps the highest btu available in a portable air conditioner is 14000 BTUs. The air conditioner that has this high btu is the Sunpentown WA-1410H, which is portable.
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.
400k btu
12,000 BTU's