Heating issues with FreeBSD on laptop

Hi,

I just installed FreeBSD on my laptop, and everything went smoothly, 
except one thing that my laptop seems to be a little warm and noisy 
(due to the fans) even when it's idle.

Following some steps on other forums, I tried the following:

$ sysctl 'hw.acpi.thermal'

This gives me an 'unknown oid' error.

$ sysctl -a | grep temp

This gives no results.

After running

# kldload coretemp

and retrying:

$ sysctl -a | grep temperature

I do get the CPU temperature values:

dev.cpu.15.temperature: 51.0C
dev.cpu.13.temperature: 50.0C
dev.cpu.11.temperature: 50.0C
...

All this is when the laptop is absolutely idle with just the shell 
running in the TTY. I can confirm that

# top

shows the same (CPU 100% idle).

I'm not sure what is going wrong and would be grateful for any help.

Thanks!
Saniya