Yikes! I'm sorry to hear that - especially in this heat. Unfortunately, it's impossible to know without more information regarding the property and the applicable lease terms. Who is responsible for air conditioning can depend on a number of factors, including the terms of your lease (if you're leasing). But, very generally, if the AC is out at your apartment or condo, the landlord might be responsible for air conditioning issues. If it's a commercial building, the terms of the lease will probably clarify who's responsible for AC troubles - but contacting the landlord would help to clarify.