Reasons HVAC Systems Keep Turning On and Off
If your HVAC system keeps turning on and off, this issue is known as short-cycling. Not only does constant cycling often lead to increased energy bills, but it can also make it especially difficult to keep your home cool during the summer months. Let’s take a closer look at what causes this problem to occur.
Dirty Air Filter
A dirty air filter is among the most common causes of short-cycling. Reduced airflow ultimately forces an HVAC system to work significantly harder. Fortunately, replacing the unit’s filter is easy and cost-effective.
While many traditional filters are typically rated to last up to 90 days, they may need to be changed more frequently in some cases. This is especially true if there are pets in the home.
Low Refrigerant
Refrigerant is the lifeblood of your HVAC system. When refrigerant levels become low, it’s only a matter of time before the unit begins to blow lukewarm air. Your unit will ultimately need a recharge, which is a service that should only be performed by a licensed technician.
Air conditioning systems are sealed, so they do not naturally consume refrigerant. If the refrigerant level is low, you’re likely dealing with a leak. While the refrigerant level can be topped off, this is only a temporary fix. The best long-term solution is to repair or replace the leaking parts.
Thermostat Trouble
If your AC unit is continuously turning on and off, you could be dealing with a malfunctioning thermostat that’s sending false temperature readings. Modern thermostats are typically designed to last up to 10 years. The device’s internal sensors and electrical components gradually degrade over time. which means you may need to replace the thermostat.
Proper thermostat placement is just as important. A thermostat that is regularly exposed to direct sunlight or installed on a drafty wall will have trouble providing an accurate temperature reading.
Dirty Coils
An HVAC system features evaporator and condenser coils, which can become quite dirty. When these coils become excessively grimy, the unit will experience diminished airflow and poor heat transfer.
To help prevent performance issues, experts recommend cleaning the coils at least once a year. However, it’s important to use caution when doing so. You should steer clear of harsh chemicals and try to avoid bending the fragile aluminum fins at all costs.
Wrong AC Size
Your HVAC system should match the size of your home. Contrary to common belief, an oversized AC unit is actually more likely to experience short-cycling. Because the unit cools the interior so quickly, it won’t be able to complete a full cycle before being shut down by the thermostat. This often results in uneven cooling and high indoor humidity.
On the other hand, an AC unit that is too small may run constantly on hot days. It will struggle to maintain the set temperature. Always consult an expert before purchasing a new HVAC system.
What Are Some Common Problems That Stem from Short-Cycling?
For starters, you can expect to encounter higher energy bills. As the unit repeatedly turns on and off, it uses noticeably more power. Short-cycling also leads to increased wear and tear because the various components are subjected to greater stress. Critical parts, such as the compressor and evaporator coil, can be quite expensive to replace.
High humidity is yet another problem associated with short-cycling. Because the unit only runs for a short period before shutting off, it’s unable to remove moisture from the air. Don’t be surprised if your rooms begin to feel sticky and uncomfortable.
Don’t allow your HVAC system to keep turning on and off. One Hour Air Conditioning & Heating in Bradenton will make sure your unit stays performing at its best. You can count on our team to get the job done. We’re on time or you don’t pay a dime. Call today to schedule service.
