I'm looking to reduce energy consumption. I was reading up on Attic
fans and Whole house fans. We have a "fan" button on our thermostat
that circulates air in the house. We turn it on when we cook so that we
can have fresh air from outside. Is this considered a whole house fan
or not? How is Whole house fan different from this?

Another question is, we have fans in the roof that rotate mechanically
(no electricity) whenever there's a draft I think. Can we install an
attic fan in its place that's controlled by a thermostat so that when
the attic's temp goes up beyond certain point it's on automatically?

Thanks.