When I was a kid I worked the potato patch with me grandmother. She grew all manner of things in her backyard, but she always had me help her with the potatoes. She said it was because the potatoes were the most important, and she needed someone she could trust to dig them up. Looking back I realize quite the opposite was true, and that she had me do those because they were the hardest to screw up. In any event, those days gave me a permanent love of tending a garden and growing my own good, and that continues to this very day. Last year I took the next big step and got a climate control system for my greenhouse, so I can totally regulate all the heat and moisture my plants get. Now I am working with delicate plants from exotic climates, and this little HVAC system allows me the control I need to make it work. These plants require such intensive care that I have a smart thermostat app on my phone, to sound an alarm if the temperature or air quality levels ever go out of the optimum range. To answer your next question, air quality measures both the humidity and the amount of contaminants (including dust and dirt) in the air. Basically if any tiny little thing happens in my greenhouse, the smart thermostat notifies in me real time. It may seem silly to you to invest all this time and money into a climate control system for my plants, but one day they will make me a fortune!