Overheating of laptop, low battery life. power saving, these are the common troubles one faces in almost any operating system and in almost any laptop. Jupiter was one of the best application to reduce heating of laptops but its development stopped for reasons unknown. Though you can still install Jupiter in Ubuntu 13.04 from unofficial PPA but it is not the same thing as it will not be supported in future anymore.
With Ubuntu 13.04 TLP became the best alternative to Jupiter. But TLP is not the only tool that you can use to save battery and reduce overheating of laptops in Ubuntu 13.04. cpufreq is tiny daemon that does its job pretty well. Moreover, unlike TLP, it is not confined to command line. You can install it as an applet indicator and quickly control it from the top panel.
To install cpufreq in Ubuntu 13.04 use the following command in terminal (Ctrl+Alt+T):
sudo apt-get install indicator-cpufreq
Voila! Nothing else needed here. Now just search for cpufreq in Unity Dash and it will be started. Once started, choose Powersave option to get better battery life and less overheating.
Once you have set it to Powersave, you are good to go. Of course you can change the mode later as well. I deliberately did not discuss the CPU frequency mode as I want to keep this post short. More about it later, may be.
How to uninstall cpufreq:
Uninstalling cpufreq is as easy as it to install. Use the following command in terminal:
sudo apt-get remove indicator-cpufreq