MicroCool

Who is MicroCool

MicroCool is a Thousand Palms, California, manufacturer of high pressure fog humidification, adiabatic cooling and dust control systems, founded in 1980. In September 2026 MeeFog, the fogging business of privately held Mee Industries Inc. of Irwindale, California, acquired MicroCool.

Urth & Fyre specifies and supplies MicroCool systems in the cultivation facilities it designs. MicroCool brand searches are modest, so this page is built around what operators look up: grow room humidifiers, commercial humidification for cannabis and evaporative cooling for HVAC equipment in hot climates.

What MicroCool makes for cultivation

MicroCool systems pump water at high pressure through fine nozzles to make fog that evaporates in the air, which adds moisture and absorbs heat at the same time. The company says its products are designed, engineered and manufactured in the USA, with adjustable directional nozzles, custom climate zones and compatibility with any controller.

For indoor cannabis, the current line is the Focus System. MicroCool customizes it to each facility's layout, zoning and airflow, and it uses the Focus X Cell Humidifier, which MicroCool says produces an ultra fine 6 to 10 micron fog that evaporates instantly. Listed features include instant on and off fogging, closed loop pressure management, VFD motor control and modular scaling. At MJBizCon 2025 MicroCool previewed the Focus X Breeze, a fan assisted humidifier with a built in timer for rooms with limited airflow.

Where MicroCool fits by facility stage

• Propagation and vegetative rooms: clones and young plants are often run at higher humidity than flower, and in dry climates such as Nevada the HVAC alone may not hold the target.
• Drying and curing rooms: controlled humidification helps slow a dry that is running too fast, as covered in the water activity guide for dry and cure.
• Rooftop and condenser equipment: MicroCool condenser coil cooling sprays fog ahead of air cooled condensers to lower the air temperature entering the coil and reduce load on the HVAC. In 2005 the company said its C3 system could lower air temperature at the coil face by up to 30 degrees Fahrenheit.

How to size a MicroCool grow room humidifier

Humidifier sizing starts with how much water the room must add to hold its setpoint. That depends on room volume, the dry air coming in from outside and from the HVAC, how much moisture the plants are already releasing and whether dehumidifiers run in the same space. Rooms with heavy dehumidification or very dry outdoor air need more capacity than the plant count suggests.

Settle the number of zones, nozzle count and placement, pump size and the water treatment before you quote. MicroCool has stated in past product releases that reverse osmosis and other treatment keep calcium scale off coils, and fog nozzles need clean water for the same reason. Humidification and dehumidification should run from one control sequence, which the Cannabis HVAC Design Guide covers in detail.

MicroCool compared with other grow room humidifiers

High pressure fog

This is the MicroCool approach. A central pump feeds nozzle lines, so one system can serve several zones, and the fine droplet size lets the water evaporate before it lands on plants or surfaces. The tradeoff is a pump, high pressure tubing and a water treatment system to maintain.

Ultrasonic humidifiers

Ultrasonic units make mist with a vibrating plate and are common in small rooms. They are simple to install one room at a time, but large facilities end up maintaining many separate units, and they also need treated water to avoid mineral dust.

Steam humidifiers

Steam units boil water and inject vapor into the air stream or room. They add heat along with moisture and use more energy per pound of water, which works against cooling in a lit flower or veg room.

Buying MicroCool through Urth & Fyre

Urth & Fyre specifies and supplies MicroCool systems as part of a room or facility design and sources and quotes the line new. The fog layout is drawn with the HVAC, dehumidification and airflow plan so the systems do not fight each other. Fog humidification is one item on the commercial grow room equipment list, and its water, power and controls tie into most of the others. Urth & Fyre reports design packages in 30 to 60 days, and humidification belongs in that package rather than added after the rooms are built.

To get a MicroCool system sized and quoted for your propagation, veg or dry rooms, book a cannabis facility design consult with your room sizes and climate targets.

• Plan water treatment with the system. Fog nozzles and coil precooling both need treated water, and MicroCool has cited reverse osmosis to prevent calcium scale.
• Confirm the pump power supply and where the pump and treatment skid will sit, with drainage and service access.
• Zone the system by room or by growth stage so propagation, veg and dry rooms can run different setpoints.
• Tie humidification and dehumidification to one controller so they do not run against each other.
• On a used system, inspect nozzles for scale or clogging, check the pump for leaks and pressure hold, and replace worn tubing and fittings.
• For condenser coil cooling, MicroCool has said the approach is most cost effective on cooling packages of 50 tons and over.
• Ask about support and parts continuity after the 2026 MeeFog acquisition, and get a current lead time with the quote.