Using a broken refrigerator to create an incubator is an ideal solution for poultry farmers who value efficiency and saving resources. The housing of household appliances was originally designed as thermal insulated chamber, which allows to minimize heat loss and reduce energy costs for maintaining the microclimate. Unlike cardboard or foam structures, such a unit has high mechanical strength and durability.
The conversion process requires a careful approach to the heating and ventilation system, since a standard refrigeration unit is not used here. You will have to completely dismantle the compressor, condenser and other components of the cooling system, leaving only a sealed “case”. It is this tightness that will be the main advantage, allowing you to maintain a stable temperature even during a short-term power outage.
Creating such a device with your own hands gives you the flexibility to customize it for specific types of eggs - be it chicken, quail or goose. Properly organized heat exchange inside the chamber ensures uniform heating of the masonry on all sides. Below we will analyze in detail all the stages of transforming an old household appliance into a professional incubator.
⚠️ Attention: Before starting work, be sure to make sure that the refrigerant is completely removed from the system. Although modern freons are less dangerous, breaking the tightness of the tubes requires caution and ventilation of the room.
Preparation of the housing and dismantling of equipment
The first stage is thorough cleaning and preparation of the internal space. The old refrigerator must be freed from all removable elements: shelves, drawers, fasteners and rubber seals if they have become unusable. The internal walls should be washed with a disinfectant solution and allowed to dry completely to prevent the development of mold in the high humidity conditions of the future incubator.
Dismantling the cooling system is the most labor-intensive process. You will need to carefully saw off the copper tubes going to the compressor and remove the unit itself along with the radiator grille at the back. The holes created by removing the tubes must be sealed with epoxy resin or silicone sealant. This is critical to preserve thermal insulation properties the chamber.
- 🔧 Completely remove the freezer if it is not removable, as it takes up useful volume.
- 🧼 Treat the internal surfaces with an antiseptic to prevent bacteria.
- 🔌 Disconnect the old wiring and light bulb if they will not be used in the new circuit.
- 🚪 Check the tightness of the door; if necessary, replace the magnetic seal.
After cleaning, the interior is ready for modernization. If you plan to lay a large number of eggs, it makes sense to consider installing additional grid shelves. However, remember that the bulk of the heat will rise upward, so the distribution of trays by height should take into account natural convection air.
Heating system and selection of heating elements
Organization of heating is the heart of your incubator. Unlike a refrigerator, which is supposed to cool, our task is to consistently heat the air to 37.5–38.5 °C. For these purposes, incandescent lamps with a power of 40 to 100 W or special ceramic heaters are most often used. Incandescent lamps are good because they also serve as a light source, allowing you to visually monitor the process without opening the door.
Heating elements should be placed at the bottom of the chamber or along the side walls, but always at a safe distance from plastic parts and eggs. The optimal solution is to create forced air circulation using a fan, which will evenly distribute heat from the source. Without a fan near the floor, the temperature can be significantly higher than on the upper tiers.
⚠️ Attention: Never place heating elements in close proximity to eggs. The minimum distance should be at least 15–20 cm to prevent local overheating and death of embryos.
A thermostat is required to control the heating. This device will automatically turn the lamps on and off, maintaining the set temperature. Using a simple mechanical thermostat is possible, but sensors provide much higher accuracy, which is critical for hatching young animals. Electronic controllers Use ceramic infrared lamps instead of conventional incandescent lamps - they do not produce light, which allows you not to disturb the light regime of embryos, and have a longer lifespan services. electronic controllers with sensors provide much higher accuracy, which is critical for hatching young animals.
Organization of ventilation and humidity
High-quality ventilation is a factor that is often underestimated by beginners, but it determines the percentage of hatchability. Embryos consume oxygen and release carbon dioxide, so the air in the chamber must be constantly renewed. In a homemade incubator from a refrigerator, it is enough to arrange two holes: one in the lower part for the influx of fresh air and one in the upper part for the exit of exhaust air.
The diameter of the holes is usually 10–20 mm. To adjust the intensity of air exchange, short sections of plastic pipes with dampers or plugs can be inserted into the holes. It is important to find a balance: too much ventilation will lead to a drop in humidity and temperature, and weak ventilation will suffocate the chicks.
Maintaining humidity is the second key task of the climate control system. To do this, containers with water are installed at the bottom of the chamber. The area of water evaporation directly affects humidity: the larger the surface of the water, the higher the indicator. In dry climates, it may be necessary to install an additional bowl or use an evaporator with a wick.
| Parameter | Chicken eggs | Quail eggs | Goose eggs |
|---|---|---|---|
| Temperature (°C) | 37,5 – 37,8 | 37,7 – 37,9 | 37,5 – 37,7 |
| Humidity (%) | 50 – 60 | 55 – 65 | 60 – 70 |
| Incubation period (days) | 21 | 17 | 28 – 30 |
| Turning (once/day) | 4 – 6 | 4 – 6 | 4 – 6 |
You can control the humidity level using a hygrometer, which should be at the level of the trays with eggs. If the humidity drops, simply add water to the containers or increase the evaporation area by placing a sponge in the basin. If the humidity is excessive, increase ventilation or reduce the amount of water.
Egg turning mechanism (Automation)
Regular turning of eggs prevents the embryo from sticking to the inside of the shell and ensures uniform heating. Manually opening the refrigerator every 2-3 hours is inconvenient and can lead to heat loss, so you should think about automation. The simplest mechanism can be assembled from an electric motor, a gearbox and a rod system that will tilt the trays.
There are several design solutions. The trays can be placed on a movable frame, which rotates around the central axis 45 degrees in each direction. Another option is to use rollers on which the trays themselves move. To control this process, a timer is used, which sends a signal to the motor at specified time intervals.
How to calculate the rotation angle?
The rotation angle of the trays should be 40-45 degrees from the horizontal plane in each direction. An angle that is too small will not ensure proper movement of the yolk, and one that is too large can damage the air sac.
If creating a complex mechanism seems too labor-intensive to you, you can use a simplified scheme with a manual flip, but then you will have to strictly adhere to the schedule. However, for a large volume of bookmarks, automatic turning mechanism is almost a prerequisite for success.
☑️ Checking the rotation system
Installation of electronics and control system
Assembling an electrical circuit requires basic knowledge of electrical engineering and strict adherence to safety rules. All connections must be reliably insulated, and the wires must be protected from overheating and mechanical damage. The central element of the system is the thermostat, to which temperature sensors, heaters and, optionally, a fan are connected.
Temperature sensors should be placed at the level of the tops of the eggs, but without touching them or the heating elements. It is recommended to use two sensors: one is the main one to control the thermostat, the second is a backup sensor connected to a separate thermometer for visual control. This will allow you to notice a failure in the automation in time.
For ease of operation, place the control panel on the outer wall of the refrigerator or make an inspection window in the door. This will allow you to monitor the condition of the incubator without frequently opening the door, which leads to sudden changes in temperature and humidity.
⚠️ Attention: All electrical components must be grounded. In conditions of high humidity, the risk of a short circuit increases, so use sockets and switches with a protection class of at least IP44.
Testing and starting the incubator
Before adding biological material, a homemade incubator must go through a dry testing cycle. Turn on the device and set the thermostat to 38 °C. Let the system operate for 24 hours, periodically checking the thermometer readings at different points in the chamber. The temperature should not fluctuate more than ±0.3 °C from the set value.
During the test, check the operation of the humidifier and fan. Make sure there are no “dead zones” where air stagnates or areas of critical overheating. If you use a turning mechanism, run it several times to make sure it runs smoothly and there are no vibrations that can be harmful to the eggs.
Only after successfully passing all tests can you begin the first experimental run with a small number of eggs. Record all parameters and observations in a log, this will help you calibrate the device and understand its features. Remember that each homemade device is unique and requires individual configuration.
Frequently asked questions (FAQ)
Can I use an old refrigerator with a damaged seal?
You can use it, but the efficiency will be reduced. A damaged seal will lead to constant heat loss, and the heaters will have to work harder, consuming more electricity. It is better to replace the seal with a new one or carefully seal the cracks.
Which thermostat is best to choose for a homemade incubator?
The optimal choice would be digital thermostats of the XM-18 or RHC-2020series. They already have built-in sensors, heating and ventilation control, as well as a function for rotating trays, which greatly simplifies assembly.
Do you need to make holes in the bottom of the refrigerator?
Yes, it is better to make holes for fresh air in the lower part, and for exhaust - in the upper part. This will create natural traction. However, the main air exchange should still be provided by a fan inside the chamber.
How often do you need to add water for humidification?
The frequency of topping up depends on the volume of the container and the intensity of ventilation. Usually water is added every 1-2 days. In the last days of incubation (before biting), the humidity is increased, so you need to monitor the water level daily.