Hawley temperature swings expose faults that mild weather can leave hidden
A sharp cold front after a stretch of mild weather puts a heating system under a load it has not carried for some time. In Hawley, equipment that seemed fine while it sat unused often shows an ignition fault, blower problem, electrical issue, fuel-delivery fault or heat-pump defrost problem when the temperature drops and the house needs steady heat.
The first sign that a system starts is not the whole test. Heat has to be made, moved through the house and delivered to the rooms. A restricted filter, weak blower, loose duct connection or leaking duct can leave parts of the house cold even while the heating section runs. We check the heating cycle rather than stopping at the thermostat call.
For a heat pump, cold-weather operation includes more than indoor airflow. The outdoor unit has to run properly in the cold, and the system has to change over correctly between heat-pump heating and supplemental heat. Checking those steps helps separate a heating-output problem from a problem with heat getting where it needs to go.