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If you are asking can you use any brand condenser, the answer is yes. The condenser must be the same refrigerant type and tonnage as the inside coil, however. Is this what you are asking?
No, each unit must have it's own condenser. When you say inside units, are you talking about just a coil or an air handler with coil built in?
Oh, OK, so you have a mini split. These type of systems are more critical. They must have the matching condensing unit.
Did someone take the condensing units? Why only the inside unit?
That's not really true. Many of these units are "critical charge" by that I mean they must have an exact charge weighed in
That charge is determined by the model of the unit. I would say it "might" be able to be done with just any condensing unit. But then the other thing is these indoor units have wires that connect and communicate with the outdoor unit. I don't know how you'd get that part to work. It's not like central air units where you can put mismatched things together.
Typically the indoor unit might have, say, 4 wires that run to the outdoor unit and "communicate" with it. That is the part you are going to have trouble with.
Is there a reason why you don't want to purchase the Gree matching condenser?
You'd need to figure out the refrigerant type and tonnage. I don't know if Gree is still in business. But they could tell you, based on the model of the indoor unit, those two things.
Let's say you had a two ton, R22 system, then you'd look for a 2 ton R22 condenser.
OK, I understand
Where are you reading that?
Yes, you are correct, 3 units each doing 12,000 BTU's is 36,000 BTU's or 3 tons total.
I would say it's possible. You'd have to find a matching tonnage condenser and same refrigerant and the two units have to communicate.
The problem with that is how do you know what you're getting.
I would not recommend that. Stick with the two head system. If you need more cooling, add an additional unit. That's another thing. These two head systems have a special configuration to work off one condenser and you are going to run into problems here with trying to make this work with a conventional condenser. Your best bet would be to find the matching Gree condenser for these indoor "heads" you have. But I'm not sure if Gree is even still in business. Or you could just have 2 condensers, one for each indoor unit. Were these two heads (indoor units) originally connected to one condenser?