Efficient and quite.
Quite cool whole house fans are incredibly efficient. The reason behind the low power consumption is....
How much energy does a QuietCool Whole House Fan use? Most people run their fans for 4-8 hours a day during the summer months.
For a 500 watt fan, this would equate to about $.60 - $1.20 per day in California (energy rates at $.30 per kWh). This equates to about $18-$36 per month. QuietCool uses up-to 1/15 th of the amount of energy an A/C unit uses. QuietCool fans have one of the fastest ROIs of any green energy product on the market today.