Upon arrival customer stated usually temp is set to 70. Woke up this morning to 73 inside house. Set to 70. Roughly 53 ambient temp. Customer stated thermostat indicated gas heat on, thermostat stated to change filter. Customer changed filter and turned power off to unit. Resupplied power found thermostat reading 68. Eventually rose to 74 to match other temp reading devices in home. Went through setup with lead techs. System set up properly. Lockout at 35 degrees. Went through test runs system cycled on properly in each mode. Did not collect service charge today as tech was out 1/24. Please send tech with lead tech If issue reoccurs if possible.