Can I use Vicks v188 when the air conditioner is switched on
Depends on whether they are on the same circuit or not. Most small air conditioners draw enough power that they need to be on their own circuit. And it's best if a steam humidifier is the only appliance on it's own circuit.
If they are on separate circuits, it they should be fine. If they share the same circuit, look at the amperage of both (as shown on the appliance listing label, add them up. They must NOT exceed 12 amperes for a 15 amp circuit, 16 amperes for a 20 amp appliance circuit.
If either one is listed in watts, just take the wattage listed and divide by 120, which is the wall voltage and you will have the amperage. On air conditioners you are looking for the total wattage, NOT the locked rotor (LRR) or motor amps ratings.
Very small window air conditioners can usually share a circuit, if the amperage draw of other appliances is small enough. I doubt that it would work in this case, if you try it the worst that can happen is it will blow the circuit breaker or fuse. This will happen (usually) after a period of time for a circuit breaker or when starting for a fuse.
on Jan 05, 2016