If the indoor temperature does not drop even though the air conditioner is running at night and the set point is lowered, while the outdoor temperature remains constant, there could be several potential reasons for this issue:
Insufficient cooling capacity: The air conditioner may be undersized for the cooling load of the room or area you are trying to cool. If the cooling capacity of the AC unit is not adequate to handle the heat gain in the space, it may struggle to lower the temperature effectively.
Poor insulation: Inadequate insulation in the room can allow heat to enter from outside, compromising the air conditioner's ability to cool the space efficiently. Insufficient insulation in the walls, windows, doors, or roof can result in heat gain, making it difficult for the AC to achieve the desired temperature.
Air leaks: Air leaks in the room can lead to inefficient cooling. If there are gaps or leaks around windows, doors, or ductwork, cool air produced by the AC can escape, while warm air from outside can enter the room, hampering the cooling process.
Inefficient air circulation: Poor air circulation within the room can prevent the cooled air from reaching all areas effectively. It could be due to blocked or improperly placed vents, obstructions near the AC unit or vents, or an inadequate number of air supply and return vents.
Thermostat issues: There may be a problem with the thermostat. If the thermostat is not calibrated correctly or is malfunctioning, it might not accurately sense the indoor temperature and fail to signal the AC to cool accordingly.
Maintenance requirements: Lack of regular maintenance, such as dirty air filters or a clogged condenser coil, can restrict airflow and reduce the AC's cooling efficiency. It is important to clean or replace filters regularly and ensure that the AC unit receives proper maintenance.
To resolve this issue, you can consider the following steps:
- Ensure that the air conditioner is appropriately sized for the cooling load of the room.
- Check for any air leaks or inadequate insulation and address them accordingly.
- Verify that the air circulation within the room is unobstructed and adjust vent positions if necessary.
- Check and calibrate the thermostat or replace it if needed.
- Perform routine maintenance tasks such as cleaning or replacing filters and ensuring the condenser coil is clean.
If the issue persists, it is advisable to consult with a professional HVAC technician who can assess the specific situation and provide guidance or perform any necessary repairs or adjustments to optimize the cooling performance of your air conditioner.