Tired from coming home and you feel like your house is a sauna? I got an answer for you! Cheap and you can use your existing window fan!

Step 1: Materials Needed

Window fan that can be a fan or exhaust fan without flipping it. I got mine from Home Depot for $35.00 but you can definitely use your old ones.

Wemo smart plug in - you can buy this on Amazon for $34.99. https://www.amazon.com/Smart-Wi-Fi-Enabled-Works-A... but you can buy this at any local store such as Walmart or Home depot

MESH tag: Temperature - you can buy this on Amazon for $59.99. https://www.amazon.com/MESH-Smart-Trigger-Temperat...

MESH app that you can download on Google Play or Apple store. Search MESH Sony so it will show on top.

Step 2: Programming

Open the MESH App. For first time users I would suggest to not SKIP the tutorial as it will helps you understand the surface of the app.
Click the "+" button on the top left corner to add a new recipe.Click on the new recipe that you addedClick the "ADD" "+" button on the top right corner to add your MESH tags. (this step can be skipped if you have already paired your tags in the app)
Drag the Temperature tag onto the canvas
Scroll down on the right side until you see "Expansion". Once you reach it, click "ADD" "+" and choose Wemo Smart Plug .A pop up dialog box will appear and choose "Start Using" Follow the steps to link your Wemo smart plug. Once connected you can now Drag the Wemo icon onto the canvas.
One Temperature tag - One application
The pictures posted will guide you to set up the on/off of your window fan
make sure to set up the temperature you desire.