As the temperatures drop, your furnace becomes the unsung hero of your home, working hard to keep you warm and comfortable. But what happens when your trusty furnace starts to falter? Ignoring the warning signs of a failing furnace can lead to costly repairs, higher energy bills and even safety hazards. This guide will help you recognize five key signs that your furnace needs professional attention.
1. A Sudden Spike in Your Energy Bills
One of the most obvious signs of a struggling furnace is a sudden, unexplained increase in your energy bills. If your heating costs are climbing without a matching change in the weather or how you use your home, your furnace may be losing efficiency. As components wear out or the system gets clogged with dust and debris, it has to work harder to produce the same amount of heat. That drives up your bills and puts extra strain on the system, which raises the risk of a major breakdown.
2. Strange Noises Coming from the Furnace
Your furnace should run fairly quietly. The hum of the blower motor and the sound of air moving through the ducts are normal, but loud or unusual noises are a cause for concern. Listen for these sounds:
- Rattling or Banging: These can point to a loose panel, a loose motor mount or a worn component.
- Screeching or Squealing: This often points to a problem with the blower motor or, on older furnaces, a belt that needs to be replaced.
- Booming or Rumbling: This can be a sign of delayed ignition, where gas builds up in the burner area before it lights. This is a serious safety concern that needs immediate attention.
If you hear any of these noises, it's time to call a professional HVAC technician to diagnose and fix the problem.
3. The Telltale Yellow Flame
In a gas furnace, the burner flames should be steady and mostly blue. Many older furnaces also have a standing pilot light, which should burn blue as well, while most newer furnaces use electronic ignition instead. A blue flame means the gas is burning cleanly. A yellow, lazy or flickering flame is a sign of a combustion problem, which can be caused by dirty burners, a lack of combustion air or a problem with the gas supply.
Poor combustion can also produce carbon monoxide, a colorless, odorless gas that can be deadly. If you see a yellow flame, turn off your furnace and call Spartan Mechanical to have it inspected. Every home with gas appliances should have working carbon monoxide detectors. If you ever smell gas, do not try to find the leak yourself. Leave the house, then call your gas utility or 911 from outside.
4. Uneven Heating and Cold Spots
Is one room in your house always colder than the others? Are you constantly adjusting the thermostat to get comfortable? Uneven heating and cold spots are a common sign of trouble. Causes include a failing blower motor, leaky or poorly designed ductwork, or a furnace that is not properly sized for your home. An experienced HVAC technician can track down the root cause and recommend the right fix, whether that is a repair, duct changes or rebalancing the airflow.
5. Frequent Cycling and Constant Adjustments
A furnace that is working properly cycles on and off a few times an hour to hold the temperature you set. If yours turns on and off every few minutes, a problem known as short-cycling, something is wrong. Short-cycling can be caused by a clogged filter, a malfunctioning thermostat, an overheating furnace or a unit that is too big for the house. Whatever the cause, it wastes energy, wears out parts faster and needs to be checked by a professional.
Don't Wait for a Breakdown
If you've noticed any of these warning signs, don't wait for your furnace to quit on the coldest night of the year. Our trained technicians diagnose and repair all major furnace brands, and a yearly tune-up through one of our maintenance plans catches many of these problems early. A diagnostic visit is $95, and that fee is waived when you have us make the repair.
Our regular hours are Monday through Friday, 8am to 6pm. After-hours help is available based on technician availability, and a surcharge may apply. Call (918) 370-1260 or book online to schedule furnace repair and keep your home warm all winter.
