Heating and cooling

Furnace not heating?

Keep the furnace cabinet closed. Start with the thermostat and check whether the problem affects one room or the whole home.

Open the full furnace guide Find Toronto HVAC contractors

When to leave and call

If a carbon monoxide alarm sounds, leave and call 911 from outside. If you smell gas, leave without using electrical switches and call the gas utility’s emergency line from a safe location.

Toronto Fire Services alarm advice Enbridge Gas emergency instructions

A hand reaching toward the illuminated display and controls of a wall thermostat — Reference photo by Shixart1985 via Wikimedia Commons, CC BY 2.0. Resized and metadata removed.

Check the controls and airflow

Check that the thermostat is on Heat, and that the set temperature is above the room temperature.
Look for furniture or other items blocking the return grille or room registers. Check an accessible filter using the equipment manual.
Arrange service if the furnace repeatedly shuts down or makes unusual sounds. Give the contractor any error code you can see from outside the cabinet.

Check the furnace filter Prepare an estimate email Carrier furnace troubleshooting guide