Abstract: Embodiments of the application disclose a temperature control method, system and a temperature controller. The method includes: obtaining a target temperature value set by a user; obtaining a current energy-saving level, the current energy-saving level being used to limit an adjustment speed at which a HVAC system controls a temperature change; determining a target difference between indoor and outdoor temperatures based on a current indoor temperature value and a current outdoor temperature value; determining a target adjustment speed corresponding to the target difference between indoor and outdoor temperatures; determining a target operating mode based on a relationship between the current energy-saving level and the target adjustment speed; and controlling the HVAC system to perform a temperature adjustment operation in the target operating mode. The method can improve the user's comfort experience and effectively reduce energy consumption.