Inspected 4-year-old furnace failing to reach high-stage operation despite thermostat being set to 70°F with actual home temperature at 55°F. Determined root cause to be severe airflow restriction due to improper evaporator coil box installation, where the coil was placed inside a pre-existing box causing the SLP furnace to operate at only 70% capacity. Documented installation issue with photos for further consultation with management regarding remediation options.
