Hi, Tim, I am getting my resale EA flat soon and want to install an inverter aircon system in 3 bed rooms and 1 study room. Bed room floor areas are: 16 sqm, 12 sqm, 12 sqm and 9 sqm. What are the BTU needed for each room? What brand and model is a value for money that has less functional and maintenance problem? Should instead of using copper pipe, use stainless steel piping? What is the cost different? Any advantages or disadvantages for using stainless steel piping? Possible to conceal the piping for HDB flat? My resales flat has existing aircon. Who are the correct people to remove existing aircon? The group that install aircon or the group that do the wet work and hacking?