15 Miss. Code. R. 16-1-41.10.3
Suitable artificial heat shall be furnished to maintain 75 degrees F inside temperature with 10 degrees F outside temperature. Circulating hot water from a remote boiler or vapor steam with circulating pumps and controls on emergency electrical service to provide heating in case of power failures are the preferred methods of heating. Electrical heating will be approved provided a standby electrical generator is provided of capacity to furnish 80% of the maximum heating load in addition to other power and lighting loads that may be connected to it, or the hospital is supplied by two electric service lines connected to separate transformers at the sub-station so arranged that electric service can be maintained in case of failure of one line or transformer.
15 Miss. Code. R. 16-1-41.10.3