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A typical HVAC cycle usually runs for 10-20 minutes, depending on the current weather conditions. Cycles that run shorter than this are problematic for numerous reasons, including potential equipment damage and worse efficiency. Short cycles can occur with both heating and cooling setups. Here is what you need to know about the risks associated with short cycling. If you suspect your system is not running properly, professional HVAC service in Greenville, WI can help diagnose the issue before it leads to larger repairs.
Why Short Cycles Even Happen
Short cycles occur because something is preventing your HVAC from completing a normal-length cycle. The problem is that the potential something can be one of several possibilities.
Oversized HVAC Equipment
Properly sizing your heating and cooling systems to your home’s needs is important. An overly large system can push a lot of hot or cool air into a living space. The conditioned air is focused on the thermostat and other sensors, and the system registers that it has already reached the target temperature, leading it to end the cycle.
The problem is that the cycle may not run long enough for climate-controlled air to circulate to every corner of your home. Consequently, there may be a snap-back effect, where air from parts that didn’t fully benefit from the cycle causes the temperature to prematurely warm or cool. This leads to cycles happening over and over.
Dirty Air Filters
This tends to be a bigger problem for heating cycles, but all HVACs should run with clean filters. In this scenario, the accumulated dirt and debris in the filter stop a furnace from getting enough air. What happens is that the heat doesn’t leave the system fast enough, causing an overheating signal to trigger an emergency shutdown. The HVAC then cools, triggering another cycle. The system keeps going back and forth.
The good news is that filter replacement is simple. Once you identify the right filter for your system, you can simply replace it every three months or more often as needed.
Thermostat Trouble
Even if the system is otherwise in top operating condition, it can’t do much without the thermostat. Thermostats suffer a variety of problems. Dirt and use can knock wiring or sensors loose inside the thermostat. Sometimes the solution is as simple as cleaning contacts and reseating the thermostat into its cradle.
Calibration is also an issue. Over time, a thermostat will drift out of spec. Our technicians typically recalibrate a home’s thermostat at least once a year during standard HVAC maintenance and tune-up visits.
Poor location can also be problematic. If the thermostat is close to an HVAC vent, it might get too much air. The effect is actually quite similar to having an oversized HVAC unit. A drafty part of the house might cool the thermostat prematurely, causing it to trigger more frequent and shorter cycles. Likewise, a sunny location could convince the thermostat to shut the system down prematurely. It then cools off quickly and triggers another cycle.
Refrigerant Issues
Heat pumps and air conditioners both use refrigerant. If the refrigerant is an older type, it may not be efficient enough to keep up with modern HVAC expectations. Also, refrigerant leaks may reduce heating and cooling capabilities, leading to more on-off cycles.
Electrical Problems
Something as seemingly basic as a bad capacitor somewhere inside the system is enough to cause everything from bad readings to full safety shutdowns. A motor might also struggle to start properly, causing a cycle to cut short.
How Short Cycles Damage Equipment
Multiple components can suffer additional wear and tear due to short cycling. Nearly everything in your HVAC system suffers the most damage at the beginning of a cycle.
Compressor Wear
The compressor on a heat pump or AC does a lot of work. It also draws a lot of power during its initial warm-up, and this is when it’s most vulnerable. To be clear, every cycle brings it closer to the end of its mechanical life. Even if it is operating at normal intervals, each cycle damages it and chips away at its lifespan. Short cycling simply means more chances to wear down the parts inside the compressor.
Compressors typically last about 15 years. Wear can shorten that to as little as five years. Given that the compressor is an expensive replacement part, this one gets costly quickly.
Blower Motor Strain
A typical HVAC has a blower motor that moves air around your house. It is another part that suffers a little bit of damage every time it runs. Slowly, the materials around the spinning components erode. Initially, this makes the system noisier, with sounds coming from the dying motor.
However, the loss of materials inside the motor will also make it move more loosely, causing even more damage each time the HVAC runs. Our technicians always lubricate parts during their typical maintenance and tune-up appointments, but this only buys a little more life.
Heat Exchanger Damage
A heat exchanger serves as a transfer medium, allowing heat to enter your house’s main living area. Heat exchangers are especially important in furnaces and heating systems because they prevent exhaust fumes from getting into your living space.
The Price of Declining HVAC Efficiency
Inefficient operation drives your energy bills up. Frequent startups can easily drive your energy bills up 30-50%. Likewise, the inconsistent temperature then causes swings in the indoor climate that feel unpredictable and uncomfortable.
Damage to one component usually places stress on others. If the blower motor is working harder, for example, the compressor may work harder to support. This means wear and tear tends to spread throughout the system, especially without quick service.
Poor performance can cause damage to the rest of your house. If the HVAC can’t control humidity, your house could suffer water and mold damage.
Declining indoor air quality is another cost of worsening efficiency. Even if it just leads to more dust collecting on items in your house, the additional cleaning is an expense. Many people with respiratory conditions also experience irritation. This may lead to dry skin and eyes, wheezing, or cold-like symptoms. Households with such problems also frequently experience higher medical costs related to conditions like asthma and allergies.
At Black-Haak, we see customer satisfaction as our priority. We have a safety-focused operation, and our technicians are ready to accept heating and cooling projects of all sizes. We work on all makes and models of HVACs. Likewise, we offer a 24/7 emergency response to every customer. We are happy to service HVAC units in residential or commercial settings.
Check out the review for Black-Haak online. You won’t just see high ratings. You will also see people who wish to tell others about our integrity, professionalism, and friendliness.
If you’re worried about the possibility of short cycling damaging your HVAC, contact Black-Haak today to learn why so many Greenville, WI families and businesses trust us.
