What is the minimum indoor temperature that space-heating systems must maintain for human occupancy?

The minimum indoor temperature that space-heating systems must maintain for human occupancy is set at 68°F. This standard is established to ensure the comfort and safety of occupants in residential and commercial buildings. Maintaining this temperature helps to prevent health risks associated with exposure to cold environments, such as hypothermia and decreased immune function.

A temperature of 68°F is considered a baseline that allows for adequate warmth, especially in climates that experience colder weather conditions. This standard is often referenced in various building codes and energy efficiency guidelines to ensure that heating systems are designed to meet the needs of occupants effectively, particularly during the winter months. It balances comfort with energy efficiency, encouraging systems that can adequately keep spaces warm while also being mindful of energy consumption.