Environment

Four levers of a grow room environment

Every product in this collection moves one of four levers: temperature, humidity, airflow or CO2. Plants transpire and breathe against all four at once, which growers fold into a single figure called VPD. That is why a room is set up as a system instead of a pile of gadgets.

Put the room together in this order

1. Extraction first. Join an inline fan to a matched carbon filter and ducting. Fresh air comes in, stale humid air goes out, and roughly half the temperature and humidity issues leave with the exhaust.
2. Circulation second. Clip-on and wall fans keep air moving so a leaf is not sitting in a still pocket.
3. Then humidity. Use a humidifier in dry rooms and for seedlings; use a dehumidifier in late flower and in wet climates.
4. Then temperature at the roots and in the air. Water chillers and heaters hold the reservoir. Tent heaters cover winter.
5. CO2 last. After the items above are holding steady, CO2 is the leftover lever — and only in sealed rooms.

Keep score

Guessing does not count as tuning. Put thermometers and hygrometers in the air, testing equipment in the water, and controllers on the response once you have watched what the room does through a day.