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If your premises are unsafe or unhealthy, you can file a complaint with the Board of Health and also the local building inspector and they can come out a issue citations for any violations. However, under Indiana law, if she is stating she would deduct your purchase of a unit from rent, GET IT IN WRITING, since this is not normally something that the landlord is liable to supply if you have central air conditioning. If the apartment had a window unit when you rented it and that unit is broken, then by Indiana law, you can buy the unit and you can deduct it from rent without her approval since you put her on notice and if she tries to evict you for not paying the full rent you would have grounds to countersue her for breaching the lease and not properly maintaining the unit in the property.
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