"Comfortable" temperature is more specific than it sounds. ASHRAE Standard 55 defines a comfort zone using six variables (air temperature, radiant temperature, humidity, air speed, metabolic rate, and clothing), and the resulting envelope runs roughly 20 to 25 °C (68 to 77 °F) for typical office activity in normal clothes.
Sleep is a special case. The body needs to shed heat to fall asleep, so a warm bedroom works against it. Okamoto-Mizuno and Mizuno's review found that, with normal bedding, heat increases wakefulness and reduces slow-wave and REM sleep, and humid heat adds to the load. Bedding and sleepwear shift what feels right, so compare the bedroom's temperature history with how rested you feel rather than chasing a single number.
Workplace effects are well-documented. Productivity peaks around 22 °C and falls in both directions; offices that run cold (under 20 °C) show measurably more typo rates and slower task completion. OSHA heat-exposure rules apply at the high end for safety.
The sensor reads temperature from the Sensirion SEN66, which Sensirion specifies at ±0.45 °C typical (±0.7 °C maximum) between 15 and 30 °C, with the Bosch BMP390L's internal die-temperature available as a sanity cross-check.
References
- ASHRAE Standard 55 - Thermal Environmental Conditions www.ashrae.org
- CDC / NIOSH - Temperature in indoor environments www.cdc.gov
- OSHA - Heat exposure www.osha.gov
- Lan et al. - Thermal environment and sleep quality (review) doi.org
- Okamoto-Mizuno & Mizuno - Effects of thermal environment on sleep (review) doi.org
