If you are experiencing warmer air than you would like, then there is a good chance that there is an issue of the improper flow of air through your ducts. Dirty and clogged air ducts would make the system work harder to provide the necessary cooling, and thereby increasing your electricity bills. Hence, you need to put Aircon cleaning on your air conditioning troubleshooting checklist. Proper cleaning of air con filters and ducts is critical to their functioning and longevity. https://www.tumblr.com/accoolncool/765284974527217664/how-to-improve-ac-airflow-troubleshooting-blocked?source=share How to Improve AC Airflow: Troubleshooting Blocked Vents and Ducts