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Reasons Your Furnace May Be Struggling to Keep the House Warm Enough

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When the temperatures drop, your furnace should be your best ally in maintaining a cozy home. However, if you’ve noticed your house isn’t as warm as it should be, it could be a sign of trouble. At Red Rock Mechanical, we understand how frustrating it can be to troubleshoot heating issues in the dead of winter. Below, we’ll explore some common reasons your furnace may be struggling to keep up—ranging from simple troubleshooting to more serious problems that require furnace repair in Williston, VT.

A Clogged Air Filter

One of the most common and easily fixable issues with furnaces is a clogged air filter. Over time, dirt, dust, and debris build up on the filter, restricting airflow. When airflow is blocked, your furnace has to work harder to push warm air through your home, which can result in uneven or inadequate heating. Replace the filter if it’s dirty. Ideally, filters should be changed every one to three months.

Thermostat Issues

Sometimes, the problem isn’t with the furnace itself but with the thermostat that controls it. If the thermostat is not set correctly, isn’t calibrated properly, or has a low battery, your furnace may not receive the right signals to operate efficiently.

Ensure your thermostat is set to “heat” and that the temperature is set high enough to trigger the furnace. If problems persist, consider recalibrating or replacing the thermostat.

Pilot Light or Ignition Problems

If you have an older furnace with a pilot light or a newer model with an electronic ignition system, any malfunction in this component can prevent your furnace from producing heat. For instance, a pilot light that frequently goes out or an ignition system that won’t engage can leave your home chilly. If you’re experiencing ignition issues, it’s best to call a professional for repairs.

Lack of Maintenance

Furnaces require regular maintenance to operate efficiently. Neglecting annual tune-ups can lead to reduced performance and more frequent breakdowns. Dust buildup, worn-out components, and lack of lubrication can all contribute to a struggling furnace. Schedule a professional maintenance visit to clean, inspect, and tune up your furnace. We offer maintenance plans that make staying on top of your system’s care simple and stress-free.

A Furnace That’s Too Small for Your Home

If your furnace is undersized, it won’t be able to keep up with the heating demands of your home, especially during extremely cold weather. This is often an issue in homes where the furnace was not properly sized during installation. Have an HVAC professional assess whether your furnace is appropriately sized for your home. If it’s too small, you may need to replace it.

Aging Furnace

Furnaces typically last 15–20 years. If your system is nearing the end of its lifespan, it may struggle to maintain consistent warmth in your home. Aging furnaces often experience declining efficiency, higher energy bills, and more frequent repairs. If your furnace is over 15 years old and showing signs of wear, it’s time to start considering a replacement. 

Call Red Rock Mechanical for Expert Furnace Service

A furnace that can’t keep up with the cold is more than just an inconvenience—it can also lead to higher energy bills and additional wear on your system. Our team is here to help with all your heating needs, from simple repairs to complete system replacements.

Red Rock Mechanical, LLC serves Northwest Vermont & Northeast New York. Contact us whenever you need assistance with keeping your home cozy and warm. 

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