Why Furnace Short Cycling in Jurupa Valley Can Be a Sign of a Bigger Problem

Inland Empire Comfort
January 29, 2025
Heating Repair in Jurupa Valley

Short cycling is a silent killer in the HVAC industry. Unfortunately, most people go months or even years without realizing it’s happening. But what is short cycling, and is it dangerous? Yes, but it could also be a sign of a much bigger problem.


That’s why you need to pay attention to your heating and cooling cycles. If you need heating repair in Jurupa Valley, call the experts at Inland Empire Comfort the second you notice something is off. Let’s learn some more about short cycling and how to diagnose it.


What Is Furnace Short Cycling?

You may have noticed your heating or cooling turning on and then quickly shutting off minutes later with no apparent change in temperature. This is called furnace short cycling, and it’s an incredibly common issue.


Imagine you set your thermostat to 72°F. When the system turns on and starts its cycle, it might blow out air at 92°F. That warm air mixes with the cooler air in the house until the overall temperature reaches 72°F. But if it shuts off too soon, you will end up with uneven temperatures. These frequent on-off cycles are common without proper maintenance, leading to all sorts of expensive and dangerous issues.


Is Furnace Short Cycling Dangerous?

Furnace short cycling is dangerous when left unchecked. It is a major culprit in many HVAC issues, including the following:

  • System damage: It takes a lot of energy for a system to start its cycle. If it has to do this seven or eight times in one hour, it can easily harm some of the more delicate internal components.
  • Uneven temperatures: A common symptom of heating cycle interruptions is noticeable temperature differences between rooms in your home. For example, one room may feel up to 10 degrees warmer while another feels much cooler.
  • Humidity issues: When the air conditioner doesn’t run as it should, it struggles to control moisture during summer. If this goes on too long, you might start to see or smell dangerous mold and fungus in your home.
  • Heat exchanger malfunctions: Your heat exchanger prevents dangerous gases like carbon monoxide from mixing with the air in your home. If your heating is turning on and off repeatedly, Heat exchanger damage can leak toxic chemicals into your home.
  • High energy bills: Frequent shutoffs lead to system inefficiency, forcing your heating system to work harder. This uses more energy and increases your utility bills over time.

Any one of these is reason enough to warrant a service call.


Common Causes of Furnace Short Cycling in Jurupa Valley

Overheating is a pervasive issue in homes with airflow restrictions. This will trigger a safety shut-off, resulting in interrupted heating cycles.

Thermostat issues can also cause frequent interruptions in your furnace’s performance. Make sure your thermostat isn’t near a vent, in direct sunlight, or close to a heat-producing kitchen appliance.: 


Finally, you may be surprised that 90% of all central air conditioners are installed or sized incorrectly. When your system is undersized, it won’t be able to heat your home, leading to short cycling. When it’s oversized, the air in your home doesn’t have the chance to circulate and mix properly.


How To Prevent Short Cycling With a Manual J Load Calculation


What Is a Manual J Load Calculation?

The manual J load calculation is a professional assessment recommended by the Air Conditioning Contractors of America that calculates your home’s heating and cooling demands. 


What Does It Measure?

The manual J load test calculates the total heat your home gains (BTUs per hour) in the summer and the total heat it loses (BTUs per hour) in the winter.


When a professional from Inland Empire Comfort factors in your home’s square footage, window and door placement, insulation, and the number of occupants, they can determine whether your system is sized correctly.

Furnace Short Cycling in Jurupa Valley

Call the Experts and Solve Your Short Cycling Problems in Jurupa Valley

So, is furnace short cycling dangerous? Yes, in many ways. When you ignore the symptoms and risks of furnace short cycling, you’re putting your family, HVAC system, and money on the line.


If you notice any of the symptoms of furnace short cycling, including furnace circuit board burnout, call the experts at Inland Empire Comfort right away. They have over 360 five-star reviews on Google and are Riverside, California’s #1 trusted HVAC repair specialists. 


Don’t wait until small problems turn into big repairs. Call Inland Empire Comfort today to schedule your appointment!

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