Simulate Smart House

I use Arduino Mega 2560 with several sensors, motors and electronic devices to simulate a Smart House in my Senior Technical Project at NBCC. The house works well. However, I would appreciate some ideas to improve it. Thank you.
This is the link to my project on YouTube: https://www.youtube.com/watch?v=56ppfB4-sXY

Change the lower case "o" on the LCD (at 1:23) to a degree symbol using:

lcd.print((char)223);
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Thank you so much. I thought about this character, but in the end, I forgot because it was too many things to do in the project. Thanks for reminding me.

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