How to lower humidity in incubator


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Incubation is essential in hatching eggs, utilizing a controlled environment to nurture and develop embryos into healthy hatchlings. This delicate phase demands precise management of conditions, notably temperature and humidity, to replicate the mother’s natural role. 

Humidity, in particular, is critical; it regulates internal egg moisture and is vital to the embryo’s survival and proper growth. Striking the right humidity balance is thus imperative. Excessive humidity can be detrimental, leading to overhydration and potentially fatal for the developing embryo. 

The need for meticulous humidity control underpins the incubation’s success, highlighting the fine line between thriving life and developmental failure.


Lower Humidity in Incubator

An incubation device mimics the natural process by which birds hatch their eggs. It maintains a controlled environment with precise warmth and moisture settings to support embryonic growth. The humidity regulation in such an apparatus is vital, as it directly influences how much water evaporates from within the eggs, which can impact how the embryos mature. Excessively high humidity levels can impede the necessary moisture reduction, potentially causing complications like inadequate development of the air cells and challenges during the emergence of the chicks.

Ideal Humidity Levels:

  • Early Stages of Incubation: 40-50%
  • Final Days Before Hatching: 65-75%

Why Lower Humidity?

  • Lowering humidity might be necessary when:
  • The incubator’s humidity level exceeds the ideal range.
  • Condensation appears inside the incubator.
  • Eggs are losing moisture too slowly, as indicated by weighing them.

Steps for Lowering Humidity in an Incubator

Check the Incubator’s Hygrometer: Ensure your hygrometer (humidity gauge) is accurate; consider using a calibrated or digital hygrometer for precise measurements.

Reduce Water Sources: If the incubator has trays or channels filled with water for humidity, remove some water to lower the humidity level. Do this incrementally to avoid drastic changes that may stress the eggs.

lower humidity in incubator

Increase Ventilation: Most incubators have adjustable vents or plugs that can be opened to increase airflow and decrease humidity. Adjust these gradually and monitor the moisture closely.

Open the Incubator Lid Briefly: Sometimes, simply opening the incubator lid for a short time can reduce humidity. However, avoid significant temperature fluctuations and perform this step quickly and carefully.

Use a Dehumidifier: In environments laden with moisture, employing a dehumidifier within the space can aid in regulating the ambient humidity, thereby contributing to the stabilization of moisture levels inside the incubator.

Add Rice or Silica Gel: Non-toxic desiccants like rice or silica gel packets can absorb excess moisture. Please place them in the incubator away from the eggs.

Understanding Humidity in Incubation

What is Humidity?

Humidity tells us how much water is in the air. This element is crucial in incubation because it directly impacts the moisture levels inside an incubator, which can significantly affect embryonic development or the progression of items under cultivation.

Relevance of Humidity in Incubation

In the process of incubation, whether artificial or natural, regulating humidity is essential to mimic the conditions a parent bird or a precise laboratory environment would provide. The right humidity level ensures proper embryo development, prevents dehydration or drowning of embryos, and facilitates the correct growth rate for cultured specimens.

Optimal Humidity Levels in Incubation

Stages of Avian Incubation

  • Setting Phase (Days 1-18 for chickens): 40-50% humidity is recommended.
  • Lockdown/Hatching Phase (Last 3 days for chickens): Increase to 65-75% to ensure the membrane doesn’t dry out and the chick can hatch effectively.

Impact of Incorrect Humidity Levels

  • High Humidity: This can reduce moisture loss from eggs, overly large air cells, and potential hatching difficulties.
  • Low Humidity: This may cause excessive moisture loss, too small air cells, and potentially dehydrated and weak chicks.
how to lower humidity in incubator

Tools and Technologies for Measuring Humidity

  • Hygrometers: Hygrometers are tools used to detect how much moisture is in the air, offering both traditional dial displays and modern digital readouts with differing levels of precision.
  • Psychrometers: Psychrometers use the principle of wet-bulb and dry-bulb temperatures to determine humidity levels. These are more manual but can be very accurate when used correctly.
  • Data Loggers: Data loggers can monitor and record environmental conditions over time, providing a detailed understanding of the humidity trends within the incubator.
  • Accuracy of Humidity Measurement Tools: Each device has its own level of precision, with digital hygrometers and data loggers generally offering more accurate and easy-to-read measurements than analog devices or psychrometers.

Maintaining Stable Humidity Levels

  • Calibration: Regularly calibrate your instruments to ensure accurate readings, crucial for maintaining the appropriate humidity levels.
  • Water Trays and Channels: Adjust the amount of water in trays or channels inside the incubator to increase or decrease the humidity.
  • Ventilation: Proper ventilation is critical. Adjust the vents to control airflow and regulate humidity.
  • Environmental Control: Control the room environment where the incubator is located. Use dehumidifiers or humidifiers to stabilize the room’s humidity, which affects the incubator’s internal moisture.
  • Regular Monitoring: Check humidity levels frequently with reliable instruments to catch any deviations early and adjust accordingly.
  • Use of Desiccants or Humidifying Agents: Incorporate materials like silica gel to absorb excess moisture or sponges and cloths to add moisture when needed.

Factors That Affect Humidity Levels

  • Amount of Water Present: The amount of water placed inside the incubator is the most direct factor influencing humidity levels. Incubators often use water receptacles like trays or basins, and the extent of water’s surface area exposed to the air inside plays a crucial role in determining how much moisture evaporates into the chamber.
  • Helpful Advice: To regulate the moisture levels, consider altering the size or the number of water vessels and changing the exposed water surface area to the air.
  • Temperature: Temperature and humidity are closely linked. As the temperature within an incubator increases, the capacity of the air to retain water vapor also elevates, potentially raising the humidity levels provided there is an adequate water supply.
  • Practical Tip: Use a thermostat to consistently monitor and regulate temperature because even slight fluctuations can affect the humidity.
  • Airflow: Proper ventilation is essential in an incubator. It helps maintain uniform temperature and humidity throughout the space. However, too much airflow can lower humidity by carrying moisture away. In contrast, insufficient airflow can lead to stagnant conditions with pockets of differing humidity.
  • Practical Tip: Ensure that the incubator has adjustable vents, and optimize airflow without causing rapid loss of humidity.

Eggshell Porosity and Quantity

Eggshells are porous and allow for the exchange of gasses and moisture. The number of eggs and their shell porosity can affect the internal humidity level. More eggs or eggs with higher porosity will release more moisture, impacting overall humidity.

Practical Tip: Consider the total mass and condition of the eggs when setting up the incubator to balance the internal humidity.

Importance of Proper Humidity Levels

  • For Eggs: Embryos require precise conditions to develop correctly. Too much humidity can prevent proper gas exchange and lead to oversized embryos. At the same time, too little can cause dehydration and difficult hatching.
  • For Other Subjects: In cases where something other than eggs is being incubated, like bacterial cultures or cell lines, the proper humidity is crucial for preventing desiccation and promoting healthy growth.

Consequences of Improper Humidity Levels

  • Excessive Humidity: leads to condensation and wet surfaces, promoting mould growth and bacterial infections.
  • Insufficient Humidity: Causes subjects to dry out, hampering growth or leading to high mortality rates.
eggs in incubator

Step-by-Step Guide to Reducing Humidity

Ventilation Adjustment

Purpose: Open vents allow moist indoor air to escape and drier outdoor air to enter, balancing indoor humidity.


  • Identify the most humid areas in your home.
  • Locate existing vents or windows near these areas.
  • Open vents during the day, especially during the warmer part when the outside air is less humid.
  • During cooler months, intermittently open vents to minimize heat escape yet permit the release of excess humidity.

Tips: Use window-opening mechanisms that allow you to adjust the opening to control airflow. During high pollen seasons or in areas with heavy pollution, use air purifiers to maintain indoor air quality while ventilating.

Adding Extra Ventilation Holes


  • Determine where additional ventilation is necessary by monitoring where humidity accumulates.
  • Consider professional assistance for creating new ventilation holes to ensure structural integrity.
  • Install new vents or grilles to cover the holes and control airflow.

Effect: Additional holes will help dissipate excess moisture, especially in problematic areas like bathrooms or kitchens.

Managing Water Sources within the Incubator

Purpose: Minimize excess water vapor from water trays contributing to humidity.

Steps: Place water trays strategically within the Incubator, away from direct heat sources that can increase evaporation.

  • Adjust the quantity of water according to the humidity level needed; less water equals lower humidity.
  • Use materials like sponges within water trays to control the rate of evaporation.

Tips: Regularly measure humidity levels to determine if the water tray adjustments are adequate. Change the water frequently to prevent mould growth.

controlling humidity in incubator

Incorporating Absorbent Materials


Selection and Placement: Choose desiccants such as silica gel or calcium chloride for high moisture absorption. Place absorbent materials in breathable containers or bags and distribute them around the most affected areas.

Effectiveness: These materials help maintain lower humidity levels by trapping excess moisture from the air.

Regular Monitoring and Adjustment

Importance: Indoor humidity levels can fluctuate with changes in outside weather, indoor heating, and daily activities like cooking or showering.

Monitoring Strategy: Use a hygrometer to check humidity levels regularly. Observe patterns over time to understand how different factors affect indoor humidity.

Adjustment Tips: Tweak the number of absorbent material containers based on humidity readings. Adjust the water levels in trays and ventilation utilization based on current conditions.

Benefits of Lowering Humidity

Lowering indoor humidity levels is beneficial for health and home maintenance. Limiting moisture levels indoors is crucial for preventing the growth of mold and mildew, which can compromise respiratory health and structural soundness. 

Less humid air enhances comfort levels and supports more effective cooling, diminishing the need for constant air conditioning use and potentially saving energy costs. Lower humidity also protects furnishings from warping and electronics from moisture damage. 

Additionally, it deters dust mites and other pests that thrive in moist environments, contributing to better overall air quality. Regularly managing humidity promotes a healthier, more comfortable living space and safeguards the longevity of your home and belongings.

Causes of High Humidity in an Incubator

High humidity levels in an incubator can stem from various causes. Excessive water in the tray can lead to higher moisture levels, while insufficient ventilation hinders proper air circulation, resulting in an accumulation of humidity. 

Continuously accessing the incubator by opening its door could result in an unwanted increase in internal moisture due to the entry of moist air from outside. Inadequate or malfunctioning equipment, such as faulty sensors or hygrometers, can give incorrect readings, leading to improper humidity regulation. 

Situating the incubator in a location characterized by natural dampness or elevated environmental humidity levels may cause an accumulation of moisture within the incubation space. It is crucial to oversee and manage these elements for the incubator to function effectively.

humidity control meter

Last words

Managing humidity levels within an incubator is essential for successful incubation. We’ve discussed the importance of avoiding frequent door openings, which can admit excess moisture, and the impact of placing the unit in a high-humidity environment. 

Both practices can dramatically alter the internal conditions and affect the incubation process. Understanding and controlling these factors are vital to ensuring the health and development of the incubated subjects. 

I encourage readers to diligently apply the highlighted steps and best practices to maintain the delicate balance required for practical incubation. Your attention to these details will significantly determine your success in this sensitive endeavor.

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