Mastering Temperature and Humidity

The Sweet Spot: 28^oC to 32^oC

Think of temperature as the “accelerator pedal” for your business.

• At  28^oC: Crickets are sluggish. Growth is slow.

• At 30^oC: Crickets are hyper-active, eating constantly and growing at maximum speed.

• Above 35^oC: High risk of “mass die-offs” due to heat stress.

Low-Cost Heating Strategies

1. The Light Bulb Method: A simple 40W or 60W old-fashioned (incandescent) bulb placed near the bins can provide enough radiant heat for a small setup. Do not use LED bulbs for heat; they stay cool!

2. Room Insulation: If you are farming in a “Mabati” (iron sheet) structure, the temperature will swing wildly. Adding a simple ceiling made of cardboard or plywood can trap a layer of air and stabilize the temperature.

3. The Water Bath (Thermal Mass): Placing a large barrel of water in the corner of your cricket room. It soaks up heat during the day and slowly releases it at night, keeping the room from freezing at 3:00 AM.

Managing Humidity

Crickets need a relative humidity of 50% to 70%.

• If it’s too dry: Crickets struggle to “molt” (shed their skin). You will see crickets with half-shed skins stuck to them; they usually die.

• If it’s too wet: The egg trays get soggy, and a “green mold” starts to grow. This mold is toxic to crickets.

• The Fix: Use a simple spray bottle to “mist” the air above the bins once a day if it’s a dry season. Ensure the floor of the bin stays dry.

Temperature Impact on Harvest Timing

Case Study: The Mud Hut Incubator in Zimbabwe

In a rural part of Zimbabwe, a farmer used a traditional mud-and-thatch hut for his cricketery. While his neighbors with tin-roofed houses struggled with the cold winter nights, the thick mud walls of his hut acted as natural insulation. During the day, he opened the door to let in warm air, and at night, the mud walls kept the interior at a steady 27^oC. By using “Ancient Architecture,” he maintained a consistent production schedule without spending a single cent on electricity for heating.

Important Things to Keep in Mind

• Invest in a Thermometer: A simple digital thermometer (often sold for greenhouses) costs very little but tells you exactly what is happening inside your bins.

• Airflow is Safety: Never completely seal a bin. Ammonia from cricket waste can build up and kill them if there isn’t a vent for fresh air.

• Night Monitoring: Check your farm’s temperature at 10:00 PM. If it’s below 25^oC, you need to add insulation or a heat source.