When Should I Schedule Furnace Maintenance Service?

man changing furnace air filter

It’s that time of year again when the leaves are changing color and the weather is starting to cool down. Soon you’ll be needing to crank up your furnace to keep warm. Before you do, it’s important to make sure that your furnace is in good shape. Welsch Heating & Cooling explains when to schedule your furnace maintenance and what is included in a typical maintenance appointment.

What’s Included in a Furnace Tune-Up?

Furnace maintenance includes a number of steps, such as a safety inspection, cleaning and adjustment of all parts, lubrication where necessary, and full diagnostic testing. It’s best to have this tune-up performed by a certified HVAC technician because they will have a trained eye to know what issues to look out for. During your furnace maintenance session, your technician will:

  • Thermostats are inspected to ensure correct communication with the furnace.
  • Electrical connections within the furnace are tightened to ensure safe operation and prevent wear that can cause components to fail prematurely.
  • Motor voltage and current are tested to ensure there are no defects.
  • Motor bearings are lubricated to prevent wear and tear within the furnace’s motors when appropriate.
  • For condensing furnaces, the condensate drain system is inspected for clogs and cleaned out to ensure proper removal of moisture from the unit.
  • All operational and safety controls are tested for correct and safe performance, checking the equipment’s start, run, and shutoff cycles.
  • The flue piping is inspected to ensure it is in good condition and that no clogs or disconnections could cause flue gasses to back up into the furnace.
  • The heat exchanger is inspected to ensure it is in safe and does not have any carbon monoxide leaks
  • Gas pressure, burner combustion, and ignition systems are tested and adjusted if necessary to improve performance.
  • The air filter in the furnace is replaced with customer approval.

Schedule Furnace Maintenance Today with Welsch Today

Our comprehensive furnace maintenance tune-up includes a full inspection of all components of your system, cleaning and adjustment of key parts, and safety checks. Contact us today to make an appointment for this important annual service.


Our family tried 4 other company’s in St. Louis to replace old boiler and three AC units for a 4,500 sq. ft. , 100 year old home. It was a VERY complex project involving a lot of thought and creativity. The project was also completed a week before its expected...


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We got four estimates and two of them were pretty high and two were very close, Welsch being one of those. But at the end of the day I was very happy with Welsch and the amount of time they took to figure out the right size AC and Furnace...

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Welsch Heating & Cooling were professional from the first steps to the completion of my project. They replaced two furnaces in my house. The sales rep was trustworthy with the units he recommended. He also pointed out existing ventilation problems that could be a safety concern. The installation crew were...

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