A geothermal HVAC system for irrigation preheating consists of a geothermal heat pump, a ground loop system, and a heat exchanger. The ground loop system is made up of buried pipes filled with a fluid that circulates through the pipes, absorbing or releasing heat as needed. The heat exchanger is responsible for transferring heat from the fluid to the irrigation water. Additionally, a control system and sensors are required to monitor and regulate the system’s operation.