No. The max credit is $600 for AC, not per AC unit. So, it doesn't matter if you installed one or 5, your credit is limited to $600 for Air Conditioners.
To get the $1,200, you would need to have done other things as well like windows, doors or insulation.
The overall Home Energy Efficiency Improvement Credit is limited to $1,200 for all items but the biomass boilers or furnaces. These two items allow you to claim an additional $2,000 for the Home Energy Efficiency Improvement Credit.
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