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Good afternoon. I am Loren, a licensed attorney, and I look forward to assisting you.
Is there a written lease currently in effect? If so, does it contain any restrictions which would be applicable to installing an AC?
They have no right to modify the written lease unilaterally. They can not, with a written lease, change the rental amounts during the lease term.
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Your next course of action is to continue to pay the original rent on time. So long as you are not in default of the lease they can not evict you.
If they do try then you can sue them for wrongful eviction, as they would be in breach of the lease.
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