Otis Singleton
Keeping a greenhouse warm without electricity can be challenging, but several methods can help. Firstly, sealing any gaps and spaces in the greenhouse structure is crucial to prevent heat escape. Additionally, utilizing natural sunlight during the day and covering the greenhouse with insulation blankets or foam boards at night can minimize heat loss. Implementing geothermal energy, solar power, or soil heat storage systems can also provide sustainable heating solutions. For those seeking a simple and cost-effective approach, painting the greenhouse walls black is an option, as black absorbs heat more effectively than other colors. Another innovative method is to harness the heat generated by composting or livestock, providing a natural source of warmth. These strategies can collectively contribute to maintaining a warm greenhouse environment without relying solely on electricity.
| Characteristics | Values |
|---|---|
| Solar power | Using solar panels to collect energy and convert it into heat for the greenhouse |
| Insulation | Using foam boards, double-layered plastic films, or insulation blankets to reduce heat loss |
| Geothermal energy | Utilizing the consistent ground temperature and sunlight to heat plants |
| Humidity | Increasing humidity to trap heat during the day and emit it at night |
| Natural gas | Using propane or natural gas heaters to heat the greenhouse |
| Oil | Oil heaters are less expensive to run than electric heaters |
| Kerosene | Kerosene heaters are refillable and eliminate the need for an outlet |
| Livestock | Placing a rabbit hutch or chicken coop in the greenhouse for consistent heat generation |
| Paint | Painting the walls black to absorb more heat |
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What You'll Learn
Solar panels
The first step in setting up solar panels for your greenhouse is to determine whether your system is on-grid or off-grid. If you are connected to a utility company's electricity grid, you can use solar panels to supplement your energy source. However, if you are off-grid, you will need a solar generator system with battery storage to store the excess energy produced by your solar panels during the day.
The number of solar panels you need depends on your energy usage and the size of your greenhouse. A small greenhouse may only require a single 400W solar panel, while larger greenhouses may need several. You can calculate your energy usage by adding up the watts from each piece of equipment, such as heaters, lighting, and pumps for automatic irrigation systems.
To install your solar panels, start by setting up the brackets or mounting system. Then, attach the panels and connect them in series. If you are using battery storage, you can use a solar battery like EcoFlow's Solar Generator, which has a built-in inverter to convert and store the electricity.
In addition to solar panels, there are other passive solar techniques you can use to keep your greenhouse warm. One method is to use water barrels or jugs, which absorb heat during the day and release it at night. Spray paint the containers black or cover them with black trash bags, and place them in a sunny spot in your greenhouse. Another option is to create a "hot bed" or composting pile, which can generate heat through decomposition. You can also improve insulation by sealing gaps and using double-pane windows or clear plastic to prevent heat loss.
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Insulation
Firstly, inspect your greenhouse for any gaps or openings and seal them. Filling in these spaces will help trap the heat inside and prevent it from escaping. This can be done using insulating materials such as foam boards or double-layered plastic films. These materials act as an extra layer of insulation, creating a barrier between the warm air inside and the cold air outside.
Another way to insulate your greenhouse is by using geothermal energy or soil heat storage. You can build a Walipini, which is a greenhouse constructed below the frost line in the ground. This type of greenhouse utilizes the consistent ground temperature to provide warmth to your plants. However, building a Walipini requires labor-intensive work, such as digging down six to ten feet and constructing sloped dirt floors and walls to prevent water seepage.
In addition to sealing gaps and utilizing geothermal energy, you can also use insulation blankets or foam plastic to cover your greenhouse at night or during cloudy days. These materials help retain heat and minimize heat loss. Similarly, you can use thermal mass to absorb and store heat. This can be done by placing barrels or jugs of water inside the greenhouse, although it may require a significant amount of water to make a noticeable difference.
If you live in an area with ample sunshine, solar panels can be an effective way to generate heat without electricity. Solar-powered heaters collect solar energy and convert it into heat, providing a sustainable and eco-friendly option for warming your greenhouse. However, installing solar panels can be expensive and may require a significant upfront cost.
By combining these insulation methods and utilizing natural resources, you can effectively keep your greenhouse warm without relying on electricity. These techniques will help trap and retain heat, creating a more favorable environment for your plants during colder seasons.
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Humidity
Another method for trapping additional heat in a greenhouse is to have a rock or brick wall inside your greenhouse, often referred to as "thermal mass." Some objects, like rocks, clay, and bricks, absorb heat when the air is warm and release it when the air is cold. Water also has good thermal mass. To heat for free, take advantage of thermal mass by making raised beds with stone or brick walls to absorb the heat. It’s a good idea to put some black barrels or water around as well.
In places with extremely cold temperatures, it is recommended that homes have double-pane windows to be more energy-efficient, allowing warmth from the sun to come in during the day and prevent heat loss due to cold temperatures outside. While it might be too costly to use double-pane windows for a greenhouse, it might be helpful to add a layer of (repurposed) clear plastic to create a double-pane effect. This will help seal the greenhouse as well.
Ventilating your greenhouse may seem counterintuitive when trying to heat it, but it is helpful. Good ventilation prevents humidity buildup and helps control temperatures. Ventilation systems such as vents and louvers can circulate air and remove excess dampness.
If you do have electricity running to your greenhouse, infrared heaters can be used to keep humidity levels lower. A submersible bucket heater is another way to heat the pond water and, thus, the greenhouse. These heaters are readily available and inexpensive, but they consume 1 kilowatt of electricity per hour. If using specific types of supplemental heat, you might find a dehumidifier useful in combating high humidity levels.
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Geothermal energy
There are several ways to implement geothermal heating in a greenhouse. One method is to sink the greenhouse into a pit, typically around six to eight feet deep, below the frost line. This allows the structure to tap into the earth's warmer temperature and regulate the internal temperature of the greenhouse. This method, known as "Walipini," meaning "place of warmth", requires significant labour to dig down and create a sloped dirt floor and hard-tamped dirt walls to prevent water seepage.
Another approach is to utilise underground pipes with deep air vents. By burying pipes within the greenhouse and circulating air through them, the air absorbs heat from the warmer ground, creating a natural heating system. This technique provides consistent and reliable temperature control, ensuring uniform temperatures inside the greenhouse.
Geothermal heating systems can also be designed as passive systems or more sophisticated systems with heat pumps. Passive systems rely on the natural flow of heat energy, using underground piping to heat or cool the air, depending on the seasonal needs. In contrast, more sophisticated systems use heat pumps or fans to push warmer air from the underground piping up into the greenhouse when the underground temperature is higher than the ambient temperature above ground.
Geothermal heating offers significant advantages over traditional heating methods. It provides more consistent temperature control, ensuring stable temperatures inside the greenhouse. Additionally, it is environmentally friendly and highly efficient, with efficiencies ranging from 300 to 600%, compared to 75 to 90% for standard fossil-fuel furnaces.
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Livestock
Keeping animals inside your greenhouse is a cheap way to heat it up. The heat generated by the animals' body temperature, breathing, and the fermentation process of their manure can help keep the greenhouse warm. Rabbits, for example, can be kept inside the greenhouse during the coldest months, keeping them comfortable and closer to their food sources. Chickens are another option, with a commercial hen generating about 10 watts of heat. However, it is important to note that animals may consume your plants if not properly separated, and you must also ensure the welfare and health of the animals.
The Greenhouse-Livestock Integrated System is an innovative method that combines a small greenhouse with livestock farming. This system makes use of the heat generated by the animals to warm the greenhouse naturally. The heat from the livestock's body temperature, breathing, and the fermentation process of their manure all contribute to the greenhouse's warmth. Additionally, the heat produced during the composting of animal manure can be transferred to the greenhouse, further increasing the temperature. This method not only improves energy efficiency but also reduces environmental pollution by recycling farm waste.
When using livestock to heat your greenhouse, it is crucial to consider the animals' health and comfort. Ensure that they have adequate ventilation and that the greenhouse does not become too hot for them, especially during warmer days. Proper isolation measures should also be implemented to prevent potential disease transmission.
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Frequently asked questions
Insulating materials such as foam boards or double-layered plastic films can be used to prevent heat from escaping the greenhouse.
Making use of solar energy by ensuring the greenhouse receives ample sunlight during the day is one way to keep it warm. Covering the greenhouse with foam boards or insulation blankets at night or on cloudy days also helps to reduce heat loss.
Painting the walls of the greenhouse black is a simple and cheap solution as black absorbs heat more than any other colour. Placing a rabbit hutch or chicken coop inside the greenhouse is another inexpensive way to keep it warm.
Solar-powered heaters are an eco-friendly option for greenhouses in areas with plenty of sunlight. Geothermal energy or soil heat storage can also be used to provide heat.
