Presented By

SPECIAL MENTION: When paired with the Sensibo Air Pro, your regular air conditioners or heat pumps become smart devices. The device can help save energy, improve air quality, and turn the machine off and on automatically when you leave or come home.

More Must-Reads From TIME

Contact us at letters@time.com.

Hydration Made Fun
A Modern Flip Phone
A Saliva Pregnancy Test
More Than a Fast Car
A Breakthrough Bassinet
EDIT POST