Fan blows by voice over imovie

Tonight we tried a lot of things but the problem stays. My boyfriend has a

Macbook pro 13”, 2.7 ghz, core i5, 8gb, 1800 mhz and we did exactly the same on his computer as on mine:

I have a

Macbook pro, retina 15”, mid 2015, 2.2 ghz, core i7, 16gb, intel iris pro 1536 mb, 1600 mhz

His computer does not give so much noice as mine. Also my notebook gets much warmer than his. And mine is blowing so much harder but still gets hotter.... And it only happens when I do a voice over. But thats my work... so its so anoying! I hope some one can help me?

Sorry but that did not help. I also did a clean install but both didn’t work. After like a minute of voice over the fan starts blowing.