I bought a laptop cooling pad and it definitely lowered the laptops fan speeds.
With my HP zbook Reaper would increase the temp enough to make the fan go full force. Noisy, especially for recording.
The pad keeps the temp at ~130 F, which keeps the internal fan quiet.
When I am ready to record, I unplug the cooling pad to eliminate the noise it makes.
My laptop gets hot only on the left side, so I removed the grill of the pad and unplugged 3 of the fans. It was easy, just bend some tabs.
This is the pad I bought, it is pretty quiet.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Don