Actuators for dampers and valves connect to infrastructure components and provide the force needed to open or close the connected valve or damper. Electric HVAC damper actuators open and close HVAC components using electricity and control signals from a control device. Electric HVAC valve actuators connect to compatible valves and control their position based on electric control signals. Pneumatic HVAC damper actuators connect to compatible dampers and control their position based on pneumatic control signals. Pneumatic HVAC valve actuators connect to compatible valves and control their position based on pneumatic control signals. Electric HVAC actuator accessories help users to install, maintain, and repair electric actuators. Pneumatic HVAC actuator accessories help users to install, maintain, and repair pneumatic actuators.