DIRTY AIR-CONDITIONER FILTER

The air-conditioners filters in the school library were very dirty causing restriction in airflow resulting in airflow cooling problems.  Luckily a few of my students are good at servicing the air-conditioner and I so I got two of them to help service the four air-conditioners.  I was told that if we get professionals to do the job, they charge RM100 for each air-conditioner.  This does not include re-gassing it.  Wow! Thank goodness, my students could do it.