Here's a secret from 35+ years of Hamilton winters: a healthy share of "no heat" service calls end with our technician flipping a switch, swapping a filter, or resetting a tripped safety — five-minute fixes hiding in plain sight. We'd rather teach you the checklist than bill you for it. Work through these in order.

1. Thermostat first — always

Set to Heat (not Cool or Off), setpoint a few degrees above room temperature, and fan on Auto. If the fan is set to "On," the blower runs continuously and blows unheated air between cycles — which feels exactly like a broken furnace. Dead batteries in older thermostats cause more phantom failures than any furnace part.

2. The filter

A clogged filter chokes airflow, the heat exchanger overheats, and a safety switch shuts the burners down — while the blower keeps pushing cool air. Classic symptom: warm-ish air that goes cold, repeatedly. If the filter looks like grey felt, replace it, then give the furnace ten minutes to reset its cycle.

3. The switch that looks like a light switch

Every furnace has a service switch on or near it — and it looks exactly like a regular light switch. Basement tidying, kids, a visiting electrician… it gets flipped. Check it, then check the breaker panel for a tripped "furnace" breaker. Yes, gas furnaces need electricity.

4. The intake and exhaust pipes

High-efficiency furnaces vent through white PVC pipes out the side of the house. After a snowstorm or a hard blow off the lake, snow and ice can block them — the furnace senses it can't breathe and locks out. Clear both pipe ends, restore, and it'll often recover on its own. (Hamilton-specific: check after every lake-effect dump.)

5. The condensate drain

Those same high-efficiency furnaces produce water, and if the drain line clogs or freezes, a float switch stops the party. Standing water near the furnace or a visible kinked/crushed drain hose is your clue.

6. Listen to what it's trying to do

  • Click-click-click, then nothing: igniter trying and failing — that's a part, call us.
  • Whoomph of ignition, runs briefly, shuts off: short-cycling — often filter/airflow, sometimes a sensor.
  • Blower runs forever, never any heat: ignition never succeeded — igniter, gas valve, or flame sensor.
Smell gas at any point? Stop troubleshooting. Leave the house, then call your gas utility's emergency line and then us. No checklist outranks that rule.

When it's genuinely our turn

If you've cleared all six and the house is still cold, the fault is behind the panel — igniters, sensors, control boards, gas valves — licensed-tech territory. We answer 24/7, we stock the common parts on the truck, and we'll tell you the price before we start. Keeping you comfortable since 1989; the emergency line is the same number as the regular one.