You can check with the Ft. Worth housing dept. to see if they have a specific standard. In Dallas if the temperature reaches 85 then the air conditioning does not work there is a violation of the covenant of habitability. In your situation, you would be taking the position that not providing air conditioning when the temperature reaches a high temperature violates the covenant of habitability included in every lease including a verbal lease. What you would do is give a notice in writing that the air conditioning has to operate at lower temperature than it is currently set at to avoid a continuing breach of the covenant of habitability because the high temperature adversely affects your health. Texas Property Code Section 92.052. The Dallas ordinance is 20578 which requires the air conditioner to be at least 20 degrees lower than the outside temp or 85 degrees whichever is warmer. You can use this as a standard if there is no standard in Ft. Worth.

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