77, looks like you've done a really good job building your styrobator!
The fan you can probably get by without, but, I do think you will have to have a thermostat of some kind. Otherwise, there is no way to regulate the temperature and it will just keep getting hotter and hotter 'til your eggs are sunny side up.
I bet if you show your Dad your new incubator and ask him nicely, he will be more than happy to help you put a thermostat inside.
In exchange, he might even want to borrow it sometime.
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Yep, I agree on needing the thermostat..
I was using a dimmer before and just couldnt get it stabilized..Now I've got a hot water heater thermostat..And things are looking better..
I also moved all the hardware from a styrofoam cooler to a "max cool" plastic cooler..
We tend to open up all the windows when the weather is cool enough..So there's definitly fluctuations on the house temps..