How can you turn on the furnace?

To turn on the furnace, first ensure the thermostat is set to the desired temperature and is in heating mode. Locate the furnace power switch, typically found near the unit, and make sure it’s in the 'On' position. Next, check the gas valve (if applicable) to ensure it’s open, then ignite the pilot light if necessary. Finally, allow the furnace a few moments to start and monitor for proper operation.