It is 5 a.m., the house is 58 degrees, and the thermostat is calling for heat. Before you assume the worst, a few checks separate a five-minute fix from a real service call.
Quick checks that solve a surprising number of calls
Confirm the thermostat is in Heat, not Cool or Off, and that the setpoint is above room temperature. Dead batteries still cause no-heat calls every season.
Check the furnace or air-handler switch (often a light-switch lookalike) and the breaker panel. Reset once; if it trips again, stop and call.
Pull the filter. A summer of AC dust packed into a dirty filter can starve airflow enough that safety switches lock the unit out on the first long heating cycle.
When to stop troubleshooting
Smell of gas, scorch marks, water around electrical components, or a carbon monoxide alarm means leave the area and call for help. Do not keep cycling the system.
If the inducer runs, the igniter glows, and nothing lights, or a heat pump outdoor unit sits silent while the house cools, that is a same-day diagnosis. We triage by temperature risk and route density during business hours.
Prevention beats the 2 a.m. scramble
Fall tune-ups catch weak capacitors, dirty burners, and failing flame sensors before the first arctic blast. If you skipped service last September, schedule now rather than hoping for a mild January.
Last updated August 4, 2026