This question already has an answer here:
So I'm in a tiny dorm room and I normally point my fan blowing outside the window to cool my room off. I've been in some debates on blowing air out or in is more effective, so I'm hoping to get some empirical data to back up my claim. Things I have
A Heater with only low, medium, high settings.
I do not have a thermometer.
So the best I could think of was melting ice cubes. I don't care about the exact temperature, just which method is more effective.
I've outline the basis of my experiment:
Shut the windows and turn the heat on high, 15 minutes
Open the windows, turn off the heat, turn on the fan on high, 15 minutes
Leave $n$ ice cubes out and take the average of how long it takes them to melt.
All the ice cubes are from the same tray. Can anyone devise a better experiment with no tools...