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6 Furnace Issue Warning Signs to Watch Out For

Nov 19, 2020

November may have given us a few warm, sunny days, but it’s safe to say heating season is upon us in Minnesota. We’ll have our furnaces working hard for the next few months, making it crucial for homeowners to know when their system needs professional repair or replacement. Use these furnace issue warning signs so you know when it’s time to call in the pros this winter.



Old Age

With proper installation and regular maintenance service, furnaces will last 15 to 20 years on average. Check the age of your furnace, and if it’s over 15 years old, it’s time to start considering an upgrade. Contact WestAIR for a free estimate and to schedule a professional inspection and evaluation with one of our HVAC technicians.


Frequent, Costly Repairs

Your furnace should be serviced annually for maintenance, but regular repairs that take a toll on your wallet are a sure sign that your furnace needs replacing. If repair service costs 50 percent or more than a replacement, a system upgrade is highly recommended. Not only will you receive peace of mind throughout the heating season, modern furnaces offer much higher efficiency and performance, saving you money on utility and repair bills.


Irregular Sounds, Smells, and Cycling

HVAC systems operate quietly and can easily go unnoticed if they’re functioning properly. Keep an eye (as well as an ear and nose) out for these irregular warning signs:


  • Banging, rattling, popping, humming, or screeching sounds
  • Persistent or random burning smells
  • More frequent on/off cycling (AKA short cycling)


These complications indicate serious mechanical problems that decrease heating efficiency and pose a potential fire hazard. Contact WestAIR, your local HVAC company, ASAP if you notice any of these issues.


Uneven or Inefficient Heating

Properly sized, installed, and maintained furnaces are designed to heat your entire house evenly. Signs of inefficient heating include:


  • Finding cold spots or different temperatures in rooms around the home
  • Having to adjust the thermostat frequently to maintain comfort
  • Turning the temperature higher than normal to keep the house warm
  • Seeing unexpected spikes in utility bills


If you experience any of these issues, the solution could be anything from a simple repair to a thermostat or furnace replacement. Don’t suffer through poor heating and higher c

osts – have an HVAC technician inspect your system and diagnose the problem and discuss your options.

Decreased Indoor Air Quality

Furnaces and HVAC systems are designed to help maintain indoor air quality and humidity as well as temperature. Yours might be failing if you or your family notice the following:


  • Stuffy or stale air
  • Dry nose, throat, or skin
  • Excessive dust accumulation
  • Frequent static shocks
  • Cracked wood on furniture, fixtures, and frames
  • New or worsening allergy symptoms


Carbon Monoxide Exposure

Furnaces fueled by gas or oil produce carbon monoxide, which is poisonous and potentially life-threatening with prolonged exposure. Heating systems are designed to trap and safely exhaust this dangerous gas, but it is possible for a leak to develop over time and put your family at risk. Signs of a carbon monoxide leak include:


  • Yellow and/or flickering burner flame (should be blue with a consistent burn)
  • Soot around the furnace and registers
  • Excess moisture on exterior windows, walls, and other cold surfaces
  • Rust, cracks, or corrosion on/around flue pipes and other furnace components


Warning signs of carbon monoxide exposure can also mimic common illnesses, so beware of unexplained nausea, frequent headaches, confusion/disorientation, burning nose and eyes, and flu-like symptoms. Remember, carbon monoxide poisoning can cause serious health issues and even death. If you or a family member experience any of these signs and symptoms, seek medical attention immediately and then call your utility provider and HVAC technician ASAP.


We all know that Minnesota weather offers plenty of surprises, and getting stuck with a broken furnace is a surprise we could all do without. Remember these furnace issue warning signs so you can stay ahead of issues and know when it’s time for professional repair or replacement service.


WestAIR is a Rheem Pro Partner and proudly services all residential HVAC brands. Contact us for all your heating and cooling needs.

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