Many owners of summer cottages often wonder where to put the old, a failed unit that can no longer keep the cold. Throwing a bulky body into a landfill is not environmentally friendly and often costs money, and leaving it to rust in the open air spoils the appearance of the site. An ingenious solution for recycling is to create a mini-greenhouse or a winter garden where you can grow seedlings, herbs or even exotic plants all year round.
The idea is that a sealed, thermally insulated body is ideal for creating a controlled microclimate. It is easy to maintain optimal humidity temperature inside such a structure, protecting the plantings from winds and night frosts. Transforming household appliances into an agronomic tool requires certain skills, but the result is worth it: you get a compact greenhouse with minimal costs for materials.
In this article we will analyze in detail all stages of the transformation, from choosing a model to installing automated irrigation systems. You will learn how to properly prepare the interior space and what materials will be needed for finishing. The main thing is a creative approach and the desire to give old equipment a second, useful life.
Selecting a suitable model and preparing the case
The first step will be to find and prepare a donor for your future green corner. Old Soviet models like ZIL, Saratov or Biryusaare considered an ideal option, as they have thick walls and high-quality door seals. Modern units are also suitable, but their plastic interior trim may require removal if you plan aggressive disinfection or drilling.
Before starting work, all internal equipment must be completely dismantled. The compressor, condenser, evaporator and shelves must be removed.
⚠️ Attention: If you cut the tubes, make sure that there is no pressurized oil left in the system. Also, under no circumstances burn the polyurethane foam insulation contained in the walls, since when burned it releases toxic substances.
After removing the “filling,” the body should be thoroughly washed and degreased. It is better to treat metal surfaces with an anti-corrosion compound to extend the life of the structure. The door can be left hanging for access to plants or removed if you plan to use the refrigerator in a horizontal position.
To increase efficiency, some craftsmen recommend painting the outside of the cabinet a dark color so that it better absorbs solar heat during the day. However, if the greenhouse will be in a room with artificial light, the color does not matter. The main thing is tightness joints and the absence of drafts.
Organization of internal space and drainage
The interior of the former refrigerator will now become a home for your plants, so it needs to be properly prepared. Standard shelves made of glass or plastic can be left if they are durable, but it is better to replace them with more functional elements. For example, instead of solid shelves, they often install mesh structures or lattice trays that do not interfere with air circulation and water passage.
Particular attention should be paid to the bottom of the case. As you water the plants, the water will flow down. To avoid the formation of swamps and rotting roots, it is necessary to organize high-quality drainage. A layer of expanded clay or coarse crushed stone is laid on the bottom, over which agrofibre is spread. This will prevent stagnation of moisture and the development of mold.
- 🌱 Drainage layer: Minimum 5-7 cm of expanded clay or broken brick to drain excess water.
- 💧 Drain hole: At the very bottom of the back wall you can drill a small hole to drain excess moisture into tray.
- 🛡️ Metal protection: It is better to cover the bottom and lower parts of the walls with food-grade polyethylene or special moisture-resistant paint.
If you plan to grow tall plants, the shelves can be removed completely, leaving only bottom. In this case, the soil is poured directly onto the drainage layer or into containers installed inside. This arrangement allows you to place larger specimens, for example, dwarf palms or tall varieties of tomatoes.
For ease of maintenance, the interior can be equipped with a system of hooks for hanging pots. This will make the most efficient use vertical space and place more greenery in a limited area. The fastenings must be reliable to withstand the weight of pots with wet soil.
☑️ Preparation of the internal volume
Lighting system and additional lighting
Natural light penetrating through a slightly open door or special windows will not be enough for plants, especially in winter. Therefore, installing artificial lighting is a critical step. The best choice would be LED strips or special full-spectrum phytolamps that do not heat the air as much as incandescent lamps.
Lamps are attached to the internal shelves or ceiling of the refrigerator. It is important to calculate the power of the lamps so that it meets the needs of the crops being grown. For seedlings and greenery, a moderate flow is sufficient, while flowering plants will require more intense light. The wiring should be laid outside the housing or in special cable ducts, observing all electrical safety standards electrical safety.
⚠️ Attention: The use of conventional incandescent lamps inside a sealed volume can lead to overheating and fire. Choose only LED equipment with low heat emission.
To automate the process, it is recommended to install a timer or smart relay. This will allow you to set specific light cycles, simulating natural day and night. Plants, like people, need a regime, and observing daylight hours will have a beneficial effect on their growth and development.
Ventilation and microclimate control
The tightness of the refrigerator is its plus for (preserving heat), but a minus for plant respiration. Without proper ventilation, condensation quickly forms inside, which leads to fungal diseases. Therefore, it is necessary to organize forced or natural air circulation.
The easiest way is to embed a computer cooler into the side wall or door. It can operate constantly at low speeds or turn on on a timer. A more advanced option is to install a humidity sensor that will start the fan only when the moisture level exceeds a specified threshold. This will allow you to maintain ideal balance without your intervention.
The temperature regime also requires control. It can get too hot inside on sunny days and cold at night. To solve this problem, you can use a thermostat that will control a heating element (for example, a mat for seedlings) or a cooling fan.
| Parameter | Normal value | Critical value | Control tool |
|---|---|---|---|
| Temperature | +18..+25°C | < +10°C or > +35°C | Thermometer / Temperature regulator |
| Humidity | 60-70% | < 40% or > 90% | Hygrometer |
| Illumination | 10000-15000 Lux | < 5000 Lux | Luxmeter |
| CO2 | 400-600 ppm | > 1000 ppm | Ventilation |
Do not forget that different plants require different conditions. Cacti prefer dry air, and tropical vines prefer high humidity. When designing the system, consider what exactly you are going to grow in order to configure the equipment accordingly.
Automation of watering and power supply
Manual watering in a closed volume can be inconvenient, especially if you leave the dacha for the weekend. Automation of this process will save your crop from drying out or, conversely, from flooding. The simplest system consists of a container of water, hoses and drippers installed under each plant.
More complex systems include pump, a timer and soil moisture sensors. When the soil dries out, the sensor gives a signal and the pump supplies water to the roots. Such a system is completely autonomous and requires only periodic checking of the water level in the tank and the presence of fertilizers in the solution.
- 💧 Tank: Use a 5-10 liter canister installed above the level of the plants for gravity flow.
- ⏱️ Timer: A mechanical or electronic timer will allow you to set watering intervals.
- 🌿 Droppers: Medical droppers are a cheap and effective way to dose water for each pot.
For For power supply of all electronics (lights, fans, pumps), it is better to select a separate outlet with an RCD. All connections must be securely insulated, since the humidity in the greenhouse is always high. It is better to lay the wires in corrugation or cable channels.
Decoration and installation
After the technical part is completed, you can move on to the appearance. The refrigerator can be painted in the color of the house or fence so that it does not stand out on the site. Some craftsmen turn it into a fairy-tale house for gnomes or decorate it with a mosaic of broken tiles.
It is better to install the structure on a flat, hard surface. If the greenhouse is located outside, make sure it is protected from direct rainfall and strong winds. You can install it under a canopy or in a gazebo, leaving access to water and power. The refrigerator door is your main access tool. It can be equipped with a viewing window made of plexiglass to observe the plants without opening the chamber and without disturbing the microclimate. The door seal should be checked and, if necessary, replaced so that heat is not wasted. power supply and water.
The refrigerator door is your main access tool. It can be equipped with a viewing window made of plexiglass to observe the plants without opening the chamber and without disturbing the microclimate. The door seal should be checked and replaced if necessary to ensure that heat is not wasted.
Frequently asked questions (FAQ)
Can the freezer be used separately?
Yes, the freezer is even better suited for low-growing plants due to its smaller volume and better thermal insulation. However, it is more difficult to organize ventilation in it due to the small space.
What plants grow best in such a greenhouse?
Greens (dill, parsley, basil), flower seedlings, strawberries, as well as moisture-loving tropical plants that require a stable temperature are ideal.
Is it necessary to make holes in the bottom for water drainage?
Required. If you plan to water, the excess water needs to go somewhere. It is best to make a removable tray under the holes so that the water can be drained or reused.
Is it safe for food?
Yes, if you used safe paints and materials for interior decoration. Old plastic and rubber can release harmful substances over time, so it is better to replace them with food analogues or glass.