Hi Tim, I getting my HDB soon, I will doing renovation before move in. Currently there 2 unit split air con on the 2 rooms. I not sure the history of the aircon ( based on the seller, he said still working good), my advise from frens said it's better change it during the renovation and inspection the pipe. My ID film told me if getting from electric shop, they only come 1 time to do the installation, where he recommend me his another air con seller will come few round for the installation. is that true? I looking for system 3 aircon with inverter, what your recommend and price with the installation? regards, orson