I think it is a good thing for human useage and its amount is also very low so itz good and well artiched and good thing for poors .its does not give any sound while working and runs very smooth and calmly, itz size is also very small and no of comprasers are more then any other air conditioner geo thermal heat pump is using in this equipment . I will suggest you to buy this and you will get benifit by this produsts