Yup, inverter-type AC's have been in the market for over 2 years, and are more efficient in terms of energy consumption (daw).

I was in the market before, kaya lang problema kasi ang installation sa kuwarto ko. That time, Panasonic's 1.5 HP inverter AC's were selling for 35k (compared to 21k for window-type AC's with the same HP rating). Tapos may cost pa kada foot of copper tubing installed.