Lennox 78H11 Defrost Thermostat L70-35F

The Lennox 78H11 Defrost Thermostat L70-35F is an essential part of the functioning of HVAC systems, particularly heat pumps. This thermostat is intended for the monitoring and control of the defrost cycle in heat pump applications. It works within a temperature range of 35°F to 70°F and the outdoor coil should defrost to reduce ice formation and maximize the efficiency of the system. When the temperature goes below the set level, the 78H11 Defrost Thermostat triggers allowing the heat pump to momentarily switch to cooling mode and melt any ice on the outdoor coil.