Anyone has any real life experience on wind turbine ventilator. Few criteria I am looking for

1) performance
2) price
3) durability and reliability eg. leakage oo malfunction
4) warranty duration
5) contact number

I basically want to reduce my house temperature in the afternoon and stop relying too much on air-condition. The long term saving as well.

I did inquire from Taika Denso for 2 x 16" free float system with 8 vents for RM1296 including installation. From some other forums I have read the price has increase somewhat, but still I am looking from long term saving. However, I want to also ensure the benefit versus cost aspect as well.