An HVAC control system is provided that is configured to prompt a user to indicate whether or not they are comfortable under current environmental conditions. In some instances the HVAC control system may be configured to prompt the user to provide additional information regarding other factors that may affect their comfort. The HVAC control system may use the information collected from the user to control an HVAC system to achieve and/or maintain an environmental condition within a building at a level at which the user is expected to be comfortable.