ORC 5321.04(A)(6):
Obligates a landlord to:
"Supply running water, reasonable amounts of hot water, and
reasonable heat at all times..."
Additionally, ORC 5321.04(A)(1):
Obligates a landlord to:
"Comply with the requirements of all applicable building,
housing, health, and safety codes which materially affect health
and safety..."
If heat is included as part of the rent, City Ordinances may require that the temperature inside the dwelling unit must be maintained at a specific temperature between certain dates of the year, when the temperature outside falls below some specific temperature, or based on some other objective standard. You need to check the City Ordinances of the city in which the property is located to find out what those requirements may be.
ORC 5321.07 requires that:
Before a tenant may take action
to deposit rent with the Clerk of Courts, terminate a written
rental agreement and move-out, or file a motion to compel repairs
with the court, that the tenant must provide the landlord with a
written notice of the problems to be corrected. If the landlord
does not remedy the condition notified of within a reasonable
length of time NOT TO EXCEED THIRTY (30) DAYS, upon receiving the
notice, the tenant may then choose his/her remedy.
When rent depositing, the tenant must pay the rent to the Clerk of Court on the date the rent is due. If the due date falls on a weekend or holiday, take the rent to the Clerk on the business day preceding the due date. Tenants who are behind in their rental payments are not eligible to rent deposit.
How to use a form letter.