If your aircon is not cold, it could be due to several reasons. One of the most common reasons is a dirty air filter that prevents proper airflow, resulting in warm air. Another reason could be a refrigerant leak, which can cause your aircon to blow warm air instead of cool air. Additionally, a faulty compressor, a malfunctioning thermostat, or a clogged condenser can also lead to poor cooling performance. In order to fix your aircon, you may need to call in a professional aircon repair service in singapore . An experienced technician will be able to diagnose the issue and provide the necessary repairs. In some cases, you may need to replace a faulty component, such as a compressor or condenser, to restore proper cooling performance.