I have several USB fans that I bought from Radio Shack around 2004 and I have used them with MacBook Pros and other laptops in the past. I bought a number of two inch spools (as in thread spools) from AC Moore or Michaels and put the laptop on top of the spools so that there is two inches from the laptop to the table and then put the USB fan underneath and it helps to keep the laptop cool. These days I use nnun hydration tubes for this purpose. I haven't had to do this with the 2014 and 2015 Macs but I did sometimes use it on the 2008 when I was doing video editing. Is that Pro? It shouldn't be. But it works. I was thinking of building an AC-powered cooling structure for Macs. It would use six desktop cooling fans under the MacBook and the MBP would sit inside the structure. I'm a bit surprised that something like this doesn't already exist as a product.