Things to Do Before You Turn on Your Furnace
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When temperatures cool down, it’s time to turn on your heating system for the first time, in a long time. Before you turn on your furnace, make sure you take the proper steps below to assure your system will run efficiently and safely.
Schedule Furnace Maintenance
When it is almost time to turn on your furnace, schedule heating maintenance. Maintenance is when a professional HVAC contractor inspects, cleans, and lubricates all parts of your furnace so it runs efficiently all winter long. Maintenance can prolong the life of your system and help prevent frequent breakdowns.
Remove Blockages From Vents & Registers
Be sure all your vents are clear from debris, including rugs, furniture, toys, and more. Blocked vents can cause your unit to run more than it needs to, which may increase your electric bills.
Set Your Thermostat to “Heat”, Don’t Rely on Auto Switches
It may sound simple, but many families assume their heating system will automatically kick on once temperatures drop. To turn on your furnace, make sure that your thermostat is switched to heat so your furnace knows when it is OK to turn on.
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Replace Your Furnace Filter for Better Efficiency
If you scheduled furnace maintenance, the HVAC technician should have cleaned and changed your furnace filter. However, if you did not schedule maintenance, be sure to switch your filter. Filters can be bought at any local hardware store and can be easily installed. A clean filter will help your heating unit run efficiently and safely.
Check Your Smoke & Carbon Monoxide Detectors for Safety
Before you turn on your furnace, be sure to test all detectors, including smoke and carbon monoxide. Rarely, a furnace can cause hazardous fumes that can cause serious injury to those who breathe it in. Carbon monoxide alarms can help prevent your family from breathing in deadly fumes in the case of a malfunction.
Test Your Furnace: What to Listen and Look For
After you take the steps listed above, it is time to test your heating system. While testing your furnace, make sure it isn’t making strange noises, is producing heat, and turns off once the home is heated.
Call Your Local HVAC Experts at Michael Bonsby for Furnace Services in Maryland, DC & Northern Virginia
At Michael Bonsby HVAC, Plumbing & Electrical, we bring years of local experience — serving Maryland, DC & Northern Virginia — so you can trust a team that knows the climate and furnace-needs of the region. We focus on efficient, safe heating system performance, and offer fast service backed by reliable technicians. Choose us because:
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We’re local and licensed, offering prompt service when you need it.
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We perform thorough inspections and filter changes to increase your system’s efficiency and lifespan.
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Your safety is our priority: we check for carbon monoxide and proper furnace operation.
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We help you avoid costly breakdowns with preventive maintenance — giving you peace of mind throughout the winter.
Contact us to get started today!
Furnace FAQs
What should I do before turning on my furnace for the season?
Before turning on your furnace, take a few precautionary steps to ensure safety and efficiency. Schedule a professional furnace inspection, switch your thermostat to “Heat,” clear all vents of furniture or debris, replace the air filter, and test your smoke and carbon monoxide detectors. After that, run your furnace to make sure it heats properly and operates quietly.
Why is changing the furnace filter before starting the season important?
Changing your furnace filter helps maintain good airflow, keeps energy use lower, and reduces wear on your system. A clean filter also improves indoor air quality by trapping dust and allergens. Starting the season with a fresh filter is one of the simplest ways to improve comfort and efficiency.
How does scheduling a maintenance check before turning on your furnace benefit you?
A professional maintenance check ensures your furnace runs safely and efficiently. Technicians can spot small issues like worn parts or dirty components before they become expensive repairs. Routine maintenance also helps extend the life of your system and can keep your manufacturer’s warranty valid.
What are the safety concerns if I skip preparation and just turn the furnace on cold?
Skipping preparation can lead to reduced airflow, overheating, or even carbon monoxide risks if something is malfunctioning. Dust buildup may burn off and create unpleasant odors, while blocked vents or dirty filters can strain the system. It’s best to prepare and test your furnace early to avoid these safety issues.
When is the best time to turn on your furnace for the first time?
The best time to turn on your furnace is in early fall, before temperatures drop significantly. This allows you to test the system, check for any issues, and schedule maintenance if needed. Turning it on early helps ensure your home is ready when the cold weather hits.
