If your AC is cooling to 25°C instead of the set point of 26°C, there could be several reasons for this discrepancy. Let's explore some common factors that may contribute to the issue:
Temperature sensor calibration: The AC unit uses a temperature sensor (thermostat) to detect the room temperature and compare it with the set point. If the sensor is not properly calibrated, it may not accurately read the room temperature, leading to a difference between the displayed temperature and the actual room temperature.
Location of the thermostat: The placement of the thermostat can influence its readings. If the thermostat is located near a heat source or in direct sunlight, it may detect higher temperatures than the rest of the room, causing the AC to run longer than necessary.
Airflow restrictions: Obstructed or blocked air vents can disrupt the proper circulation of cool air, preventing the room from reaching the desired temperature. Ensure that all air vents are unobstructed and allow proper airflow.
Overworking due to external heat load: If there are additional heat sources in the room, such as electronic devices, appliances, or direct sunlight, the AC may struggle to maintain the set temperature, especially if the cooling capacity is not sufficient.
Incorrect AC sizing: If the AC unit is undersized for the room, it may have to work harder to reach and maintain the set temperature. This can result in the inability to reach the desired temperature on extremely hot days or in poorly insulated rooms.
Refrigerant issues: Low refrigerant levels or refrigerant leaks can hinder the cooling efficiency of the AC unit, making it difficult to achieve and maintain the desired temperature.
Dirty or clogged filters: A dirty air filter can restrict airflow and reduce the cooling efficiency of the AC, leading to longer cooling cycles and potential temperature discrepancies.
To troubleshoot and address the issue, you can try the following steps:
Check the thermostat's location and ensure it is not affected by external heat sources.
Clean or replace the air filters if they are dirty.
Verify that all air vents are open and unobstructed.
Consider having a professional HVAC technician inspect and service the AC unit for any refrigerant leaks or other mechanical issues.
If the problem persists, consider recalibrating or replacing the thermostat.
Keep in mind that ambient conditions, AC unit age, and maintenance history can also influence its performance. If you're unsure about how to proceed or if the issue persists, it's best to consult a qualified HVAC technician to diagnose and resolve the problem accurately.