Had engaged Ah Boon & Team for aircon installation over the weekends. They have quoted Mitsubishi Starmex System 4 (MXY4A28VA - MSYGE18VA / MSYGE13VA / MSYGE10VA x 2) for SGD3950. The cheapest I could find, in addition, they are reputable and got rather good reviews in forums & blogs as well. As mentioned in reviews, they are not so prom in replies as Aron is overseas most of the time, and Ah boon is busy with the installations. Overall, am very comfortable with their service. Would update with technical reviews once I've start using my aircons.
