Sec. 21-34. Thermal environment.

(a) General provision. Every rental housing unit should contain safe heating and cooling facilities which are properly installed and maintained in sound condition and capable of providing adequate heating and cooling, appropriate for the climate, to assure a comfortable and healthy living environment. 

(b) Heating requirements. Every rental housing unit shall have heating, under the tenant's control, capable of safely heating all habitable rooms, bathrooms and flush toilet rooms located therein to a temperature of at least seventy degrees (70º) Fahrenheit at a distance three (3) feet above floor level in the center of the room. Required heating shall be provided by permanently installed heating facilities.

(c) Cooling requirements. Every rental housing unit shall have cooling, under the tenant's control, capable of safely cooling all habitable rooms, bathrooms and flush toilet rooms located therein to a temperature no greater than eighty-eight degrees (88º) Fahrenheit, if cooled by evaporative cooling, or eighty-two degrees (82º) Fahrenheit, if cooled by air conditioning. Temperature measurements shall be taken at a distance three (3) feet above floor level in the center of the room. Required cooling shall be provided by permanently installed cooling facilities. Except that those air conditioning facilities serving more than one rental housing unit shall only be required to be designed and operating in conformance with manufacturer's specifications.

(d) Unvented combustion heaters; prohibited. No owner, agent or manager shall provide, install or allow to be installed or used any unvented portable space heaters burning solid, liquid or gaseous fuels.

(e) Cooking appliances as heaters; prohibited. No owner, agent or manager shall allow the use of any ovens, stoves or ranges, or other cooking appliances for the purpose of heating any portion of a dwelling.

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A common example:

A common violation for this code is when a rental property does not have a working cooling system. The violation in this scenario is that all rentals must have a working cooling system under the tenants control, capable of safely cooling all rooms.