I might have the need to get an another air conditioner. Problem is I no longer have any additional space for another breaker in my main panel. I would like to know if it's safe to add another breaker on the same line for the other air conditioner? Something like the diagram below.
UPDATE:
My apologies for the lack of information. Currently my setup is similar to the diagram below but remove the first air conditioner.
The first 30 amp in the diagram is the 30 amp breaker in the main panel. Then there's another 30 amp breaker at the end before it goes to the air conditioning unit. This is how the electrician/installer did it. Although I think the 2nd breaker is not necessary.
We use 220V here and 30amps for outlets. I believe the wires are gauge 10. The current air conditioner is a 1HP non-inverter. Planning on adding a 2.5HP air conditioner.
UPDATE: 06/04/2020
Uploading image of the first A/C unit.
I don't have any info on the 2nd A/C yet as I don't have it yet. Haven't decided what to get yet but initially I wanted to get something with 2.5HP as I need to cool a 30 sqm room.
Best Answer
Ummm, no, you cannot do this and there is no purpose it in anyway. I'm going to guess that you have a dedicated 30A circuit for your 120V A/C unit. That means that there is no more than 30A available on this circuit and the installed A/C needs that amount.
If you try to add another A/C on the same circuit (all code concerns aside) you will still only have the 30A available and there will not be enough available to power the 2nd unit. So anytime both are operating the breaker will open.
What you need is a NEW 30A line from another 30A breaker in your box. You mentioned that your box is full and that's a problem.
I suggest here that you need the services of a qualified electrician to see if the current box can be reorganized to free up some space for another circuit. Otherwise the solution is likely to include upgrading your box to a new one that has more room.