USB temperature sensor

I told hubby that my new pc has been restarting by itself for more than 4 times last night. He says that it's must have been due a change in my room's temperature that caused it. Come to think of it, he may be right after all. The doorknob on my bedroom door is out of order and i cant close the door properly. The contractor cant come over till next weekend. He told me if that's the case, he will buy me one of those Temperature@lert USB Sensor with Email Alerts. I dont have to worry even if i leave the house. I have email notification on my phone. If something happens to my pc and it shuts down again, i will know.