What Is The Cheapest Way To Heat A Greenhouse In The Winter?

When the chilly winter temperatures set in, keeping your greenhouse warm can be a challenging task. However, fret not! In this article, you will uncover the most affordable methods to heat your greenhouse during the winter months. Discover ingenious ways to maintain a cozy environment for your plants without breaking the bank. Say goodbye to shivering seedlings and hello to vibrant, thriving greenery all winter long!


Insulation is a key factor in maintaining the heat inside a greenhouse during the winter months. It helps to create a barrier between the cold outside air and the warmer air inside, preventing heat loss and reducing the amount of energy needed for heating. One cost-effective option for greenhouse insulation is the use of bubble wrap. Bubble wrap insulation is easy to install and works by creating a layer of trapped air, which acts as a buffer against temperature fluctuations. By covering the greenhouse walls and roof with bubble wrap, you can significantly reduce heat loss and keep the interior warmer.

Another option for greenhouse insulation is double polyethylene film. This involves installing two layers of plastic film with an air pocket in between. The trapped air provides insulation and helps to prevent heat loss. Double polyethylene film is relatively inexpensive and can be a highly effective way to insulate your greenhouse during the winter months.

Row covers are another form of insulation commonly used in greenhouses. These covers are made from lightweight fabric and can be draped over plants or attached to the greenhouse structure. Row covers provide an additional layer of insulation and help to protect plants from the cold temperatures. They can be an affordable option for those looking to minimize heat loss and protect their crops from frost damage.

Passive Solar Heating

Passive solar heating utilizes the sun’s energy to naturally heat a greenhouse without any mechanical assistance. This method maximizes the greenhouse’s orientation and design to capture and store solar heat. The first step in implementing passive solar heating is to optimize the greenhouse’s orientation. By facing the greenhouse south or southeast, it can receive the maximum sunlight exposure throughout the day.

Thermal mass is another important aspect of passive solar heating. It involves the use of materials that can absorb, store, and release heat. Common thermal mass materials include stones, bricks, concrete, or water storage containers. These materials absorb the sun’s heat during the day and gradually release it during the cooler nighttime hours, helping to regulate the greenhouse’s temperature.

Glazing refers to the transparent materials used to cover the greenhouse structure, such as glass or acrylic panels. Choosing the right glazing material is crucial in maximizing solar heat gain. Ideally, the glazing should have high solar transmittance while minimizing heat loss. Additionally, having proper ventilation in the greenhouse can help regulate temperature and prevent overheating during sunny days.

Geothermal Heating

Geothermal heating utilizes the natural heat stored underground to provide warmth to a greenhouse. Ground-Source Heat Pumps (GSHP) are commonly used in geothermal heating systems. These pumps circulate fluid through pipes buried underground, where the earth’s natural heat is absorbed. The fluid then transfers this heat to the greenhouse, providing a consistent source of warmth. Geothermal heating is an energy-efficient and cost-effective method, as it relies on the Earth’s natural heat.

Earth tubes are another form of geothermal heating that can be used in conjunction with a greenhouse. These tubes are buried underground and ventilate the greenhouse with air that has already been preheated by the soil. As the air passes through the earth tubes, it absorbs heat, helping to warm the greenhouse. This method is particularly effective in regions with stable soil temperatures.


Composting can be an excellent way to generate heat and provide natural warmth to a greenhouse. Hot composting involves creating piles of organic matter, such as kitchen scraps, yard waste, and manure. As the composting process takes place, heat is produced as a byproduct. This heat can then be harnessed and used to warm the greenhouse.

Compost heaters are specifically designed to utilize the heat generated from the composting process. These heaters are typically placed in or near the compost pile, where they capture the heat and transfer it to the greenhouse. Compost heaters are relatively simple and cost-effective, making them an attractive option for greenhouse heating.

Solar Heating

Solar heating harnesses the power of the sun to provide warmth to a greenhouse. Solar air heaters are used to collect solar energy by absorbing sunlight through a dark surface. The heated air inside the solar air heater is then circulated into the greenhouse using fans or natural convection. This method allows for the efficient capture and distribution of solar heat, reducing the need for additional heating sources.

Solar water heating is another option for greenhouse heating. It involves using solar energy to heat water and then circulating the warm water through pipes or coils within the greenhouse. This method provides radiant heat to the greenhouse, keeping it warm and promoting optimal growing conditions.

Wood Burning

Wood burning is a traditional method of greenhouse heating that can be cost-effective, especially for those with access to an abundant supply of wood. Wood stoves are commonly used to burn wood logs or pellets, producing heat that can be distributed throughout the greenhouse. These stoves are efficient and can provide a consistent source of warmth during the winter months.

Rocket mass heaters are an alternative option for wood burning in a greenhouse. They are designed to maximize the heat output while minimizing the amount of wood needed. Rocket mass heaters feature a combustion chamber and a long, insulated mass bench. The wood burns efficiently in the combustion chamber, and the heat is transferred to the mass bench, which then radiates warmth into the greenhouse.

Electric Heating

Electric heating can be a convenient and efficient option for greenhouse heating. Space heaters are portable electric devices that can be easily placed in strategic locations within the greenhouse. These heaters work by converting electricity into heat, warming the surrounding air. Space heaters are generally affordable and offer precise temperature control, making them an attractive choice for small-scale greenhouses.

Electric furnaces are another option for greenhouse heating. These centralized heating systems use electricity to generate heat, which is then distributed through the greenhouse via ducts or vents. Electric furnaces offer efficient heating and can be suitable for larger greenhouses requiring a consistent and reliable heat source.

Propane Heating

Propane heating is a common choice for greenhouse heating, especially in areas where other fuel sources may not be readily available. Propane heaters use propane gas to generate heat, which is then released into the greenhouse. These heaters are often portable, allowing for flexibility in placement. Propane heaters are efficient and offer a convenient and reliable source of heat for greenhouse cultivation.

Propane furnaces are larger heating systems that can serve larger greenhouses. These furnaces use propane gas to produce heat, which is then distributed throughout the greenhouse through ducts or vents. Propane furnaces are efficient and can provide consistent heating to sustain optimal growing conditions.

Pellet Stove Heating

Pellet stoves offer another option for greenhouse heating, utilizing compressed wood or biomass pellets as fuel. These stoves are highly efficient and can provide a significant amount of heat with minimal fuel consumption. Pellet stoves are often automated, feeding the pellets into the combustion chamber as needed. This automation allows for precise control of the temperature within the greenhouse.

Pellet furnaces are larger heating systems that can provide heating for larger greenhouses. These furnaces operate similarly to pellet stoves but are capable of heating a larger area. Pellet furnaces are a reliable and cost-effective option for greenhouse heating, especially for those with access to a consistent supply of wood or biomass pellets.

Oil Heating

Oil heating can be an effective method for greenhouse heating, particularly in areas where other fuel sources are limited. Oil heaters use fuel oil, such as diesel or kerosene, to generate heat, which is then distributed throughout the greenhouse. These heaters require a fuel storage tank and provide a consistent source of warmth for greenhouse plants.

Oil furnaces, similar to their electric and propane counterparts, are larger-scale heating systems suitable for larger greenhouses. These furnaces use oil as fuel to produce heat, which is then distributed efficiently throughout the greenhouse. Oil furnaces are durable and reliable, ensuring consistent heating for optimal plant growth.

In conclusion, the cheapest way to heat a greenhouse in the winter can vary depending on factors such as location, available resources, and the size of the greenhouse. Insulation, passive solar heating, geothermal heating, composting, solar heating, wood burning, electric heating, propane heating, pellet stove heating, and oil heating all offer viable options for greenhouse heating. By considering the unique needs of your greenhouse and assessing the available resources, you can choose the most cost-effective and efficient method to keep your greenhouse warm during the winter months.

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About the Author: Jake Scott