26 °C during occupied daytime hours and 28 °C when unoccupied, compared with the 22-23 °C still often programmed by default. ADEME says a setpoint of 26 °C rather than 23 °C can divide cooling needs by 3. Combined with a ceiling fan, this 26-27 °C setpoint maintains perceived comfort equivalent to 24 °C without a ceiling fan, with a drastically reduced carbon footprint. It is the most cost-effective, immediate and free measure before any equipment investment.
Read the source article: Alternatives to air conditioning: 4 solutions compared