Quiet operation: The air conditioner is quiet. First chat on Shopee Chat on 15 May. The next day Raymond came down for site survey and advise how the new trunking should be since i do not want my wardrobe to be hacked off. Purchased 3 of MHi. Took 2 x 9k for common rooms and 12k btu for MBR. Climate voucher easily redeemed. The CSO promptly made refund for it via paynow. Got the earlest available date on 21 May. At 11am, Raymond came down with Tawhid and 2 guys to brief them. The 3 staff start covering my whole rooms, furnitures even sofa. . The works start and ended around 6+ pm. Tawhid and team did a great job. They tried their best to fix every thing back, swept the floors. Both my husband and i were pleased. Its a right choice to choose Commercestar Engineering. It was a hassle free. Within 7 days, my house has new aircon units with new coils n drain pipes. Raymond is such a pleasant guy explain clearly the aircon jargons to us.