Pressure controls monitor the pressure of different lines in a refrigeration system and turn system components on or off to maintain optimal system performance. Single-pressure refrigerant controls and dual-pressure refrigerant controls tap into refrigeration lines, sense the system pressure, and activate or deactivate connected system components based on the measured pressure. Differential pressure refrigerant controls react to differences between two pressure lines and regulate the HVAC system. Lube oil pressure controls monitor oil pressures and prevent system damage from a lack of oil or oil pressure. Condenser fan speed controls regulate the fan speed to ensure optimal system performance and prevent issues related to low ambient temperatures.