Tbc The filter was replaced, I contacted Madeline and relayed to her that the system is not functioning. She verbally approved a service visit to address the reason why the thermostat is not sending 24v to the Y terminal in the furnace. The t-stat was at 73 when I arrived with a setpoint of 71. When jumped the unit did produce a 22degf split. ****a service visit has been verbally approved and the scheduling request has been forwarded to Elle. Maint forms to be filled out after resolution.