The 030 in the Model number refers to the BTU Rating. So it is a 30,000 BTU unit. There are 12,000 BTU per ton so that is a 2 1/2 Ton Condenser.
Ca5024qka1
5 ton
3 ton
2.5 Tons
46371
3 tons
3
3.5 tons
2.5
The Tempstar AC model NXA636GKA100 number is a quality air conditioning unit. The tonnage number refers to the amount or unit of cooling and the seer number is for the efficiency. This model has different unit numbers to determine the tonnage and seer numbers.
2.5 ton
2 ton