Hi Net, Thank for the sharing... Today i waited for their arrive at my house around 4 pm these two young man from sg cool air came. I start to observe what they are doing and how come they can do at these price. And i was standing next to them while they are servicing my aircon. And overall i can see from a very dark and dusty aircon unit i have to white and clean. I do not know what they are doing is worth what im paying for so please advise. First i see the first guy dismantle my aircon cover and next the plactics look like a plate then follow by the blower and pass it to another guy. He then took to my master toilet and do the washing. And the first guy start to lay the protection on the floor and he put up a very big plastic plate that hold the waste water and he start to spray the chemical on my aircon and the form start to pushing out the dirts. He then holding a hose and flush it with water and my coil just turn white that i never experience it before that was my first time or i can say i never done chemical flushing before total took around 25-30 min. They did 2 unit of my aircon and compressor total im paying them $99. And after everything a guy look like malay start to invoice me, I was thinking if they want to charge me any other charges i will have to push them away as on the phone i was told per unit is $33 that all. But never did the invoice have other charge just 2 unit chemical flushing $66 + condenser $33 that all. But My question is are they doing the chemical flushing for me or just normal chemical service? Spencer