Gordon-Loomberah wrote:3ph AC implies it is quite a large unit....... the larger ones seem to be less efficient, although I dont know why.
I think that IF one was looking for efficiency, then you would buy multiple SMALL units for individual room cooling, rather than a large "Area" device. Then, just use what is needed for the family needs.
I am also not convinced that the "Inverter" technology is that effective.. I can't convince myself, but I just think that it is better to have a smaller unit running at peak/optimum capacity, than to have a larger one, ramping the power up and down to control the power consumption.
I would be convinced, if I could see practical figures for a large room with both an Inverter and a normal device..
ie KwH for Mj figures.. for 1 Vs the other for cooling for a day (same conditions)
Also the COP of the AC under the relevant conditions would need to be known- it's going to be less efficient in colder weather.
Remember that I have a Heat-Pump HWS, and with just the two of us, know that the daily cost in 50% more in WINTER.. This is because of the COP..