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Yes, call a certified technician to do the replacement of the freon.
900
600 square feet.
4000btu
5280 maximum
Air at 18000 ft is much less dense therefore making it harder for the hujman body to intake oxygen and filter it through the lungs.
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.
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
NO