A study, titled 'Thermal comfort and perceived air quality (PAQ) using automatic ceiling fans in residential buildings', tested an algorithm for automatic ceiling fan speed adjustment to enhance energy-efficient cooling and thermal comfort in warm climates. 

Conducted with 30 participants in an environmental chamber, it evaluated four fan modes—Automatic, Manual Direct, Manual Reverse, and Off—across three temperatures (27 °C, 29 °C, 31 °C). 

Results showed automatic operation provided thermal satisfaction comparable to manual control. Direct flow (downward) outperformed reverse flow at higher temperatures, improving perceived air quality (PAQ) compared to no fan. 

Automatic control maintained consistent PAQ across temperatures, offering a sustainable, user-friendly alternative to traditional air conditioning.