Personally I'm fond of Media equipment these days. They're making the ductless equipment for Carrier and a few others. Personally I've installed hundreds of ductless units and I'm not sure if there's an advantage to installing a VRF system on a residence. Efficiency would probably be lower than a multiport unit. The media multiport units I'm installing are rated for 22 seer and a 10.5 hspf. Is there a reason you want to go this route?