Try my trick. I set the power profile to as slow as the laptop can go. For me, that's Intel Speedstep and I set to "Maximum battery life".
I have a Compaq Presario 2597US laptop and its fan is incredibly loud. I use it in my grad school classes and it bugs the people around me. After my computer has been on for 20 minutes, the fan blasts every 3-4 minutes. There is not even that much air blowing out, but the sound is really loud. Is it possible to install a quieter fan in my laptop? Where can I buy a replacement fan?