Arduino based winter climate control

Hi guys, Just finished my first ever Arduino project !
The software part is very basic and simple, since i'm not a programmer =)
So feel free to take this sketch and lib, add your ideas and drop it back to me.
Also have a look on actual project on my G+.
https://plus.google.com/photos/104214846902752005935/albums/5725114938913708209
I'll upload some more photos when I choose a heater.

I'll appreciate any help or feedback.
Regards.

Climate control.zip (24.6 KB)