This is combined with other industry leading energy saving and silence technologies to produce air conditioner that provide optimum performance and room comfort wherever we are intstalled.it does not make any noise.it is recommended for indoor and out door use.the best feature is that it works on heating.Mitsubishi Air Conditiners are recommended by installer as a high quality go on for years and years unit. The mitsubishi Air conditioners service is very nice. ther AC value is also goods.