5 Causes of a Constantly Running AC

An air conditioner has numerous benefits, such as cooling and dehumidifying the air, improving indoor air quality, and enhancing comfort during hot weather. However, a constantly running AC can pose problems, including excessive energy consumption and potential strain on the unit's components. Here are common causes of a constantly running AC.

1. Dirty Air Filter

Dirt, dust, and debris can clog an air filter and impede the smooth passage of air into the AC unit. Consequently, the restricted airflow disrupts the cooling process, leading to inefficient temperature regulation. The AC's thermostat senses that the desired temperature hasn't been reached, triggering the system to continue running in an attempt to achieve the set temperature. 

However, since the dirty air filter hampers the airflow, the AC struggles to cool the room effectively. This prolonged operation not only strains the AC unit, potentially leading to malfunctions or breakdowns, but it also consumes excessive energy, resulting in higher energy bills. Regularly replace or clean the air filter to maintain proper airflow and ensure the AC operates efficiently.

2. Frozen Evaporator Coil

A frozen evaporator coil hampers the transfer of heat from the indoor air. The formation of ice on the coil acts as an insulator, preventing efficient heat absorption. As a result, the AC system is unable to reach the desired temperature, causing the thermostat to continuously signal the AC to run in an effort to achieve the set temperature. 

This prolonged operation strains the AC unit, potentially resulting in mechanical issues and increased energy consumption. Resolving the issue involves defrosting the coil, identifying and addressing the underlying cause, such as low refrigerant levels or restricted airflow, and ensuring proper insulation and ventilation around the evaporator coil. 

3. Low or Leaking Refrigerant

When the refrigerant level is low, or there is a leak in the system, the AC unit struggles to extract heat from the indoor air efficiently. This hampers the cooling capacity and prevents the AC from reaching the desired temperature. As a result, the thermostat continuously signals the AC to run in an attempt to achieve the set temperature, even though the cooling is inadequate. 

Checking the refrigerant level requires a qualified technician who can perform tests to assess the system's refrigerant charge. Additionally, they may inspect the AC components for any visible signs of leaks, such as oil stains or refrigerant residue. Addressing low refrigerant levels or leaks involves repairing the leak and recharging the system with the appropriate amount of refrigerant, which should only be done by a trained HVAC technician.

4. Improper Unit Size

An AC unit that is too small for the space it needs to cool will struggle to reach and maintain the desired temperature. The undersized unit cannot extract enough heat from the room, causing it to operate in an attempt to compensate continuously. Consequently, the AC runs longer and more frequently, resulting in excessive energy consumption and increased wear and tear on the system.

Conversely, an AC unit that is too large for the area will cool the room rapidly, triggering the thermostat to shut off the system prematurely. This short cycling prevents the AC from running long enough to dehumidify the space adequately.

5. Bad Thermostat

When the thermostat malfunctions, it may not accurately detect the actual room temperature. Consequently, the thermostat continuously signals the AC system to keep running, mistakenly perceiving the space as warmer than it really is. This constant signal tricks the AC unit into operating even when it has already achieved the desired temperature. As a result, the system continuously cools the room, wasting energy and leading to unnecessary wear on the equipment. 

Mendez Air Conditioning & Heating provides top-notch services tailored to your needs. We specialize in airflow repair, ensuring optimal circulation throughout your space. We also offer thorough duct cleaning services for improved indoor air quality. Contact Mendez Air Conditioning & Heating today to schedule an appointment.