Final answer:
The safe and comfortable temperature range is 68.0°F to 78.0°F, which translates to approximately 20.0°C to 25.6°C on the Celsius scale.
Step-by-step explanation:
The range of temperatures that are considered safe and comfortable, according to energy conservation guidelines, is typically 68.0°F to 78.0°F. This equates to approximately 20.0°C to 25.6°C on the Celsius scale, which is a common temperature range for indoor environments to provide comfort while also being energy efficient. In winter, to conserve energy, room temperatures are kept at 68.0°F, and in summer, at 78.0°F. When converted to the Celsius scale, 68.0°F is approximately 20.0°C and 78.0°F is around 25.6°C.