Go Back

3 Reasons the HVAC System May Be Failing

HVAC System Causing Discomfort?

Most people would agree that the home is meant to be a place of comfort, both physical and mental comfort. However, this comfort can be easily disrupted when the HVAC system starts malfunctioning. If it malfunctions in the hot, summer months, it starts to be a sticky and sweaty kind of discomfort. If it malfunctions in the cold, winter months, it starts to be a chilly kind of discomfort where people constantly have goosebumps running up and down their arms. 

No matter what time of year it is, no HVAC breakdown is a fun HVAC breakdown. Homeowners should recognize the reasons that their unit may be failing in order to prevent it from happening in the first place.

Debris Around the Unit

One of the biggest causes of HVAC unit failure is debris around the unit. A car driving through a big puddle of mud can’t go very fast. It might even get stuck! And the same is true for HVAC units covered in debris. They can’t work efficiently because the unit is all clogged up.

There are a lot of leaves floating around this time of year. Therefore, if the unit is located outside of the house, leaves may be clogging up the unit and preventing it from functioning correctly. If the unit is located indoors, there may be excessive dust building up on the unit. No matter where the unit is located, it should be cleaned regularly. Annual maintenance is a good starting point, but homeowners may want to clean it more frequently, depending on their unique situation.

Wrong Sized Unit


Another common cause of HVAC failure is an improperly sized unit. This is especially true if homeowners have recently built onto their home because now there is an extra room (or multiple rooms) to heat and cool throughout the year. The HVAC system may not be equipped to handle that extra space, so it has to work twice as hard to produce the same results for a larger home. 

When the unit starts working overtime, it experiences more wear and tear and can result in unit failure. If homeowners are experiencing this problem or are thinking about adding to their home, they should consult with an HVAC technician to see if they need to replace their heating and AC units.

Broken Thermostat

Oftentimes, people like to jump to conclusions. If the HVAC system starts causing discomfort in the home, many homeowners immediately assume that the AC unit or heater is broken when, in fact, it could be the thermostat instead. The thermostat controls the temperature of the house. It communicates with the HVAC system and makes temperature adjustments by telling the heating and AC units when to turn on and off. 


If the thermostat is malfunctioning, that communication can’t happen, and the HVAC system breaks down. Thermostats can fail for a variety of reasons. 

  • Overheating: If the temperature is placed in direct sunlight, it can get overheated and misread the current temperature.
  • Dirty: The thermostat just sits on the wall all day and all night. It can easily start to collect dust and dirt, which can inhibit its functionality.
  • Manufacturing defect: There may be something wrong with the device from the start. Homeowners should always test out a new thermostat to make sure it is functioning as it should.
  • Age: The average lifespan of a thermostat is 10 years. After some time, the components will start to wear down and break due to old age. 

If homeowners start to notice an HVAC failure, they need to consider all of the possibilities that could be causing that failure.

About Pro Service Mechanical

Pro Service Mechanical handles everything from residential heating and AC maintenance to commercial services and installations. Their team of professional technicians is backed by more than 10 years of experience providing top-notch commercial and residential services, so there’s virtually nothing they can’t handle! Give them a call today to schedule HVAC repair in Saskatoon, SK.