> For the complete documentation index, see [llms.txt](https://cbe-berkeley.gitbook.io/fans-guidebook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cbe-berkeley.gitbook.io/fans-guidebook/practitioner-summary/benefits-of-using-fans.md). # Benefits of using fans This guide enables engineers, architects, and facility managers to maximize the many benefits of fans and integrating fans (also known as elevated air movement devices) into HVAC systems. It introduces the advantages of using fans, describes how they work, explains how to select them, and provides guidance and resources for designing spaces with fans in buildings. The key benefits of fans are as follows: * Thermal comfort: Increased air movement across the skin remove heat from the body by convection and evaporation. Given the ability of some fans to provide more personalized thermal conditions, they can increase comfort. * Improved air distribution: Operation of fans supports the HVAC system to increase air mixing, providing more uniform temperature and air quality distribution throughout a space in both heating and cooling conditions. * Improved indoor air quality: Increased air speed may reduce an occupant’s exposure to indoor pollutants via dilution of the concentration of local sources, enhancement of the deposition rate of airborne particles onto indoor surfaces and increased ultraviolet germicidal irradiation system (UVGI) effectiveness for disinfection. * Energy savings: Fans incur significant energy savings by reducing cooling demand of the HVAC system when the indoor temperature setpoints are increased. The HVAC savings potential is about two-orders of magnitude above the fan energy use. * Cost savings: Beside the cost savings related to energy savings, using ceiling fans to distribute air more effectively throughout a space can reduce ductwork and diffusers required to serve a zone. Additionally, the higher temperature cooling setting allows HVAC system size reduction for chiller and air handling units, thus reducing the capital cost. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://cbe-berkeley.gitbook.io/fans-guidebook/practitioner-summary/benefits-of-using-fans.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.