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One way to deal with this is to come up with a threshold amount, below which is considered a minor repair. Then there is no argument.
Since your lease holds you liable for minor repairs, and there is nothing expressly defining that, it would be up to the court to determine what is "reasonable." You can argue whatever you want in this area -- perhaps something such as: "Anything less than $100 for a one-time fix is a "minor repair," because it can be funded from petty cash."
I'm just making this up, but you get the idea. "Minor" is, well...minor. And $1,450 is a substantial cost -- a major repair.
My question was am I liable for this bill I have been presented for this repair. There was no limit set it simply stated minor repairs are the responsibility of the lessee and major the lessor. I was not consulted prior to the repair I was just sent a bill to reinburse the owner who paid for the repair made after summer was over I might add. your information is good for future situations but doesn't address the current situation.
My answer addresses the ultimate problem, which is proving that you are not in breach of contract for refusing a $1,450 repair to the HVAC. That said, the landlord will almost certainly withhold the repair cost from your security deposit, and you will have to sue to recover that amount -- so, you will need my argument for the lawsuit -- because this is a judgment call for a court to decide -- there is no definitive answer.