The power of 20A air switch is 20A=4.4kW, and the maximum load of 20A air switch is 4.4kW.
Generally, the cooling power of 1.5 hp air conditioner is 1150 w, and that of 2 hp air conditioner is 1800 w
Therefore, 20A air switch, with two 1.5 hp air conditioners or one 2 hp air conditioner, or even one 3 hp air conditioner, is all right.
However, if you consider that there are other household appliances, you can appropriately buy a larger one, such as 30A air switch.
