Misc DYI

3 DIY Air Purifiers That Will Make You Breathe Easier

https://blog.adafruit.com/2017/12/12/3-diy-air-purifiers-that-will-make-you-breathe-easier/

Intructable: Make an air purifier on the cheap.

http://www.instructables.com/id/Make-an-Air-Purifier-on-the-cheap/

Intructable: How to make a demumidifer with Peltier modules.

https://www.instructables.com/id/How-to-Make-a-Dehumidifier-Thermoelectric-Cooling/