This project is super handy for the cold months ahead! Find out if cold air is getting into your house with this arduino project tutorial from Blockman301 on instructables:
Is cold air coming into your home? With this project you will make a small pocket sized tester that will test your windows, doors, etc. to see if cold air is coming in. This project uses the Arduino Uno and a ATMega328 microcontroller to find the average temperature using thermistors and see if cold air is indeed coming into your home. Go ahead and download the file available and extract it. Now lets get started!