Wondering when to try turning on the heat in your home? There's no specific date to mark on the calendar, sorry. But we can share some expert tips for a smooth transition!
First, we recommend changing your thermostat when inside temperatures become uncomfortable for you. For most people, that’s about 68 degrees or below. Or maybe you like it warmer! This part is up to you. But flipping the switch isn’t the whole story.
Steps To Turn on Your Furnace in Fall
- Change Your Furnace Filter
- Test Your Carbon Monoxide Detector
- Get a Professional Inspection
- Change Your Thermostat
Change Your Furnace Filter
Before you change the system from cool to heat, check on your furnace filter! Most should be changed every one to three months. Your furnace and air conditioner share the same fan system and filter, so it gets used all summer, too. Checking your filter monthly and at the start of every season keeps your air quality pure and your system running smoothly.
Take the time now to buy a fresh filter and change it out. Old filters are hazardous and make air harder to move, wearing out your system and costing you more to run it.
Tips For Changing Your Furnace Filter
Before sliding in your replacement filter, use a permanent marker to write the next replacement date on the cardboard frame. Set a reminder on your calendar, too!
Next, it’s important to look for the arrow or indicator on the frame and make sure this points in the same direction as the air flow. For most systems, that means the arrow should point toward the furnace but check your owner’s manual to confirm.

Test Your Carbon Monoxide Detector
While you’re changing the furnace filter, test your carbon monoxide (CO) detector! Manufacturers recommend testing your detector at least once a month. Most models have a "Test/Reset" button on the front. Press and hold this button until you hear a loud, piercing alarm. The sound indicates that the electronic components and the alarm itself are working properly. If the alarm sounds weak or doesn't sound at all, the unit may need new batteries or be replaced entirely.
Carbon monoxide is a colorless, odorless gas that can be deadly, making CO detectors vital safety devices. They provide an early warning of a CO leak, which can originate from faulty furnaces, water heaters, stoves, or car exhaust. The National Fire Protection Association (NFPA) recommends installing a CO detector on every level of your home, including the basement, and inside or near each sleeping area. Installing and maintaining these devices is a simple yet effective way to protect your family!
Get a Professional Inspection
Since it’s been a few months since your heating system ran, consider a professional inspection. Your home comfort system expert will perform various inspections and alert to issues and their solutions. Be confident in your system’s safety and performance and get it checked out before the season starts and you really need it.
The professionals will run your system and alert you to strange noises, vibrations, or smells. With a professional inspection you’ll be confident your system is safe and ready for the winter chill.
Change Your Thermostat
Once you’ve changed your furnace filter, prepared your air conditioner for the winter, and gotten an inspection, you’re ready to make the switch. Change your thermostat from cool to heat and review any automated schedules or smart home settings.
What To Do If Your Furnace Isn’t Working
If you wake up shivering this fall, check your thermostat! Did you forget to switch it from cool to heat? Many calls to fix furnaces just require checking your thermostat and following the steps above. And as always, stay vigilant for strange noises, smells, and poor performance.
Call the professionals at Henson Robinson if you suspect something’s wrong. Your unit may need repair or replacement to keep the heat on! Replacement should be considered for units that are 12 to 15 years old or more. Newer units are far more energy efficient, saving you money, and come with the assurance that you’ll be warm all winter.