Section 2801 is added to read as follows: "Scope." To provide minimum protection of health, every dwelling unit shall be provided with a heating system or heat supply in compliance with the IBC and IMC that will maintain a temperature of sixty-eight (68) degrees Fahrenheit in all habitable spaces, bathrooms, and toilet compartments when the outdoor ambient temperature is, at design condition of fourteen (14) degrees Fahrenheit. Section 2801 is added to read as follows: "Design Standards." Heating system design shall be based on accepted engineering practice standards and/or methods established by accredited authoritative agencies listed in the ASHRAE Standard. Certification of calculations and design by a registered professional engineer may be accepted by the Building Official as to compliance with this Section of the IBC. Section 2801 is added to read as follows: "Plans." The actual design conditions used shall be stated on plans submitted for permit. The minimum design condition required by this Section shall be met.