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Editor's Notes & Price Research
Offer is valid through 5/27/18 or while supplies last. Limit 5 per member. -Corwin
Edited May 16, 2018
at 12:10 PMby
Costco Wholesale has the Bionaire Twin Window Fan for $31.99 after an $8 limited time rebate valid from 5/14 thru 5/27. Available both in stores and online at Costco.com. Shipping, if buying online, is $9.99. This appears to be a member-only deal. https://m.costco.com/.product.781571.html
HOW TO HACK THE BIONAIRE TWIN REVERSIBLE AIRFLOW WINDOW FAN WITH REMOTE CONTROL TO MAKE THE THERMOSTAT WORK CORRECTLY
The Bionaire Window fan is a terrific quiet window fan that blows a lot of air. It even has a thermostatic control so that you can tell it to keep the temperature below a certain temperature and it will cycle on and off as that temperature is met. That prevents your bedroom from getting too cold at night. The only problem with the thermostatic control is that the thermocouple sensor is inside the fan housing and basically measures the outside temperature rather than the inside temperature. So I created a simple hack in order to fix this problem.
I don't take any responsibility for you destroying your fan by following these instructions. You do void your warranty by taking apart the fan and modifying it. But if you are comfortable with that here are the easy steps to modify this fan. Basically what you are going to do is to partially disassemble the fan so that you can access the circuit board, then you will move the wire that has the thermal sensor on it and drill or cut a small hole in the housing so that that sensor is now outside the fan housing and thus will measure the temperature of the inside of your room rather than the outdoors. This will make the thermostatic control much more useful.
Also, be aware that the fan control buttons are electronic and have a feature that revs up the fan to get over inertia, so you can't turn the fan on and off remotely with an Alexa Dot or Google Home attached to a smart switch. You can turn it off, but it won't turn back on without manual intervention.