What to Do If Your Furnace Stops Working on a Cold Night

There’s nothing worse than realizing your furnace has stopped working on one of the coldest nights of the year. Your home gets chilly fast, and panic can set in—especially if you have kids or elderly family members at home.

At Rogers Heating & Cooling, we know how stressful furnace breakdowns can be. That’s why we’re sharing practical steps you can take right away to troubleshoot the problem, stay safe, and keep warm until help arrives.

1. Check Your Thermostat Settings

Before assuming your furnace has failed, take a quick look at your thermostat. Sometimes the issue is as simple as incorrect settings or low batteries.

Here’s what to check:

• Make sure it’s set to “HEAT” mode.
  
• Increase the temperature a few degrees above your current room temperature.
  
• Replace the batteries if your thermostat screen is blank or unresponsive.
  
• If you have a smart thermostat, confirm it’s connected to Wi-Fi and powered on.
  

If your thermostat isn’t sending the right signal, your furnace won’t kick on—no matter how cold it gets.

2. Inspect the Furnace Power Supply

Your furnace needs both electricity and, in many cases, gas to run properly. If the system has lost power, it won’t operate at all.

Do a quick safety check:

• Ensure the furnace switch (usually near the unit) is in the ON position.
  
• Check your breaker panel for a tripped circuit breaker. Reset it if needed.
  
• For gas furnaces, make sure the gas valve is turned on.
  

If the breaker keeps tripping or you smell gas, stop immediately and call a professional; it could indicate a serious electrical or gas issue.

3. Inspect and Replace the Air Filter

A clogged air filter is one of the most common causes of furnace problems. Restricted airflow can cause the system to overheat and shut off for safety reasons.

What to do:

• Locate your filter (usually near the blower compartment).
  
• Remove it and hold it up to the light—if you can’t see through it, it’s time for a replacement.
  
• Replace the filter with a clean one of the same size and rating.
  

Regular filter changes not only keep your furnace running smoothly but also improve your indoor air quality.

4. Check Furnace Vents and Intake Pipes

In homes with high-efficiency furnaces, outdoor intake and exhaust pipes can become blocked by leaves, snow, or ice. When this happens, your system may shut down automatically to prevent carbon monoxide buildup.

Here’s what you can do:

• Go outside and visually inspect the vent pipes near the foundation or roofline.
  
• Clear any obstructions, being careful not to damage the pipes.
  
• Make sure indoor air vents and registers aren’t blocked by furniture or rugs.
  

Once airflow is restored, your furnace may restart after a few minutes.

5. Reset the Furnace System

If everything appears normal but your furnace still won’t start, try performing a system reset:

• Turn off the furnace using the power switch.
  
• Wait 30 seconds, then turn it back on.
  
• For gas furnaces, ensure the pilot light is lit (if applicable).
  

If the system cycles on and off or makes unusual noises, it’s time to call for professional help.

6. Stay Warm and Safe While You Wait for Help

If your furnace still isn’t working, here are a few ways to stay warm safely while waiting for a technician from Rogers Heating & Cooling:

• Bundle up with layers, blankets, and socks.
  
• Close doors to unused rooms to contain heat.
  
• Use safe alternative heat sources, such as space heaters rated for indoor use.
  
• Avoid using ovens or stoves for heating—they pose a fire and carbon monoxide risk.
  

7. Schedule a Professional Furnace Repair

If your furnace still won’t start, it’s time to bring in the experts. Our certified technicians at Rogers Heating & Cooling can quickly diagnose the problem, make safe repairs, and get your home warm again—often the same day.

We service all major furnace brands and offer 24/7 emergency HVAC repair throughout Southern Virginia and Northern North Carolina.

Stay Ahead with Preventive Maintenance

The best way to avoid a cold night without heat is through regular furnace maintenance. Our team recommends scheduling a tune-up before winter to catch small issues before they turn into breakdowns.

Don’t be left in the cold—call Rogers Heating & Cooling today to schedule a furnace inspection or emergency repair.