I am thinking of installing a wind ventilator (air turbine) on the rooftop of my attic. Cos during the hot season it can get pretty hot in this room. Standing fans don't really help to remove the hot air from the room either. I have seen some landed houses (Serangoon Gardens) installed them on the rooftop and they look pretty nice. And I have heard from friends that they are really effective in removing the hot air from the room. Can someone please let me know who are the reliable contractors for this job and what are the prices I should be expecting from them?
