I just put my first one in an hour ago, and it has not changed at all.  Luckily, the heatwave is gone and temps are normal again.  I was hitting 60c for the cpu on my A7V (with FOP32) and had to clock down to normal and was still at 55c.
Room temp is now 70f and cpu is 46c.  I also lapped the heatsink a little to get rid of the ridges I could feel with my nail, and that seemed to drop 1 degree or so.
Whisper fish tank filters work for me.