During the colder months, you depend heavily on your furnace. The system may run for long periods. So, small changes in its operation can become noticeable quickly. 

A furnace does not always die unexpectedly. It often provides hints earlier. Understanding them can help you determine when to seek a repair.

No heat or cold air

Maybe your furnace is operating. But blowing cool or lukewarm air. Then it is not functioning as it should. First, see if the system is in the “heat” position and that the reading is higher than the room temperature.

A dirty filter can also restrict airflow. This impacts heating efficiency. If changing the filter doesn’t help, it may be due to a problem with the:

• Ignition system
• Flame sensor
• Blower 
• Other components.

Strange noises

You can expect some noise when your furnace starts up and runs. But if it starts making a sudden noise, something is wrong. 

• Grinding noises might be caused by misaligned moving parts.
• Squealing noises could be related to a belt or motor problem. 
• Persistent clicking could be a starting or electrical issue.

A furnace running doesn’t mean that everything is fine. If not addressed, unusual noises can escalate to more serious problems.

Unusual smells

Various odors may signal different issues. 

The furnace might smell dusty when it is first turned on after a long period of time. This can be a relatively common occurrence. But if the burning odor is constant, it could indicate an electrical or mechanical problem.

A sulfur odor is more concerning. It can suggest a gas leak. If you detect this type of smell, evacuate the area and seek emergency furnace repair Edmonton.

Higher energy bills

If your furnace is working harder than normal, you may notice a spike in your heating bill. This may be caused by:

• Poor system performance
• Worn parts
• Restricted airflow
• Other issues that cause longer operating times. 

Don’t assume that the higher costs are just caused by colder weather. Instead, compare your recent usage and see if the furnace is being used more often than it normally would be.

Short cycling

This is when the system starts and stops frequently, but is unable to heat the house. This can be caused by:

• Poor airflow
• Faulty thermostat
• Overheating 
• A system that is too small or too large.

In addition to creating temperature variations in the house, the constant start-up and shut-down of the furnace puts extra strain on the heating system. If this persists, despite the filter and thermostat being checked, it may require professional diagnosis.

A key takeaway

Furnace troubles can range from simple maintenance issues to problems that need immediate attention. You may learn a lot about your heating system by keeping an eye out for variations in:

• Airflow
• Sounds
• Scents
• Energy use
• Cycling patterns.