Omar Khalid
Heating a plastic greenhouse can be challenging as plastic sheeting or tarps amplify the cold instead of warming the greenhouse. The best source of heat for greenhouses is the sun, which can be maximized by keeping the panels clean and adding insulation. However, artificial heating methods are also available, such as portable forced-air or oil-filled radiant heaters, which use electricity. Other methods include geothermal heating, natural gas, kerosene, and wood stoves, but these require careful planning to avoid melting or igniting the plastic cover. Increasing the thermal mass in the greenhouse with materials like water, soil, bricks, or compost can also help trap and slowly release heat energy.
| Characteristics | Values |
|---|---|
| Temperature range | Most plants with foliage need to stay between 65°F and 80°F |
| Heating methods | Insulation, solar heating, geothermal heating, natural gas, electricity, kerosene, compost pile, oil-filled portable radiators, IR lamps, space heaters |
| Insulation | Bubble wrap, rigid foam, batten insulation |
| Anchoring | Rope, paving stones |
| Thermal mass | Water, soil, clay, stone, bricks, ceramics |
Explore related products
What You'll Learn
Insulate with bubble wrap, blankets or foam
Insulating your plastic greenhouse with bubble wrap, blankets, or foam can help retain heat during colder seasons. Bubble wrap, in particular, acts as an insulating barrier that prevents heat loss, similar to double glazing. It is more effective on single-glazed greenhouses, but it can also work on double-glazed ones.
Horticultural bubble wrap is specifically designed for greenhouses, with larger bubbles and UV treatment for long-term exposure. It is more durable than regular packaging bubble wrap and can survive several summers of direct sunlight. The translucent material allows sunlight to enter the greenhouse, making it a preferable option to opaque insulating materials like felt or fleece.
Bubble wrap insulation can be held in place with greenhouse insulation fixing clips or fixing screws attached to the channels in the aluminium extrusion of the greenhouse. While it requires effort to install and remove, it is a cost-effective, low-carbon option that consumes no power once installed.
For those seeking alternative insulation methods, blankets or foam can also be used to insulate a greenhouse. Rigid foam insulation, for example, can be an effective way to retain heat in a greenhouse, as mentioned by a user seeking advice on heating their mini greenhouse.
Ironing a Corset: Tips and Tricks
You may want to see also
Explore related products
Use natural gas heaters
Natural gas heaters are a viable option for heating a plastic greenhouse. They are often one of the most affordable fuels due to companies expanding their pipelines and introducing fracking. Natural gas heaters can be used to provide on-demand heat for greenhouses, and they are usually suspended near the ceiling so that they can be vented. It is important to note that a low-pressure gas line must be brought over from the home through trenches.
Compared to propane or kerosene heaters, natural gas heaters produce less moisture. For example, if you maintain a 30' x 100' double poly greenhouse at 60 °F on a 0 °F night for 12 hours, a natural gas heater will add about 16 gallons of moisture to the air, while propane or kerosene heaters will add about 22 gallons.
It is worth noting that unvented natural gas heaters can emit pollutants and added moisture from combustion, which may harm your plants. To avoid this, ensure that your heater has been serviced and adjusted for top efficiency. Additionally, a free air inlet of at least 1 sq in/1000 Btu/hr input is necessary to maintain combustion efficiency.
Natural gas heaters can be used in conjunction with other heating methods to reduce overall costs. For example, you can use propane heaters on peak cold nights to avoid high demand charges, or you can utilise solar heating during the day to store heat in thermal mass devices like water jugs or bricks, which will continue to radiate heat as temperatures cool.
Kendall Jenner's Plastic Surgery: What's Real and What's Not?
You may want to see also
Explore related products
Solar panels and batteries
Solar panels are an effective and efficient way to heat a plastic greenhouse. Solar panels can generate electricity even on dull days as they do not require direct sunlight to generate energy. This makes them perfect for greenhouses, which are usually placed in areas with optimum sunlight.
Solar panels come in a variety of technologies, but photovoltaic technology is the most common for greenhouses. Photovoltaic cells convert solar energy into electricity, which can be stored in batteries for later use. This electricity can then be converted into alternating current by an inverter, which can power everyday appliances.
If your greenhouse is tied to the grid, you can connect the solar battery or inverter to your house's circuit breaker panel. However, if your system is off-the-grid, you will need a solar generator system with battery storage to store the excess energy produced during the day. It is important to keep the solar battery outside the greenhouse to prevent humidity-related issues.
The number of solar panels and batteries you will need depends on your energy usage and the size of your greenhouse. A small greenhouse may only need a single 400W solar panel, while a larger one may need several. You can calculate your energy usage by adding up the watts from each piece of equipment you will be using, such as lighting and pumps for automatic irrigation systems.
Solar heating is a cost-effective and environmentally friendly solution for greenhouses. It reduces your reliance on fossil fuels and provides an uninterrupted power supply, which is crucial for delicate plant species that require stable conditions.
Bending ABS Pipes: A Step-by-Step Guide
You may want to see also
Explore related products
![Gardtech Greenhouse Heater with Digital Thermostat, 1500W Portable Outdoor Heater with Overheat Protection, Grow Tent Heaters [Stronger air volume] Fast Heating for Patio, Garage, Flower House(Green)](https://m.media-amazon.com/images/I/71v6EcyJcYL._AC_UL320_.jpg)
Geothermal heating
Geothermal heat can be classified into three categories: low, medium, and high temperature. Low-temperature heat (50°F) can be used for maintaining temperatures just above freezing, and the payback period is typically ten years or less. Medium-temperature heat (140-300°F) can be used to heat water that is distributed through fin radiation or root zone heating. High-temperature heat (>300°F) is used for power generation but not for greenhouse heating.
Before installing a geothermal system, it is important to carefully calculate the estimated payback and implement energy conservation measures. These measures can include reducing air infiltration, installing energy curtains, insulating sidewalls and the foundation perimeter, and making good use of growing space. These measures can reduce heat loss and the size of the geothermal heating system needed.
Lithium Grease and Polystyrene: Safe or Not?
You may want to see also
Explore related products
Compost, water and bricks for thermal mass
Thermal mass is a great way to help regulate the temperature in your greenhouse. Materials with high thermal mass are excellent at absorbing and retaining solar energy. During the day, they capture heat from the sun, and as temperatures drop at night, they gradually release the stored heat. This helps to stabilise the internal temperature, creating a more consistent climate for your plants.
Water has a higher thermal mass than bricks and is a great option for thermal mass in your greenhouse. Large barrels of water, painted black, are a popular and cost-effective choice. They are easy to set up, and as long as they are exposed to sunlight, they will effectively absorb and store heat. Water barrels can take up valuable space inside your greenhouse, so consider placing them outside if possible. Regular maintenance is necessary to keep the water clean and algae-free.
Bricks are another effective option for thermal mass. Deep red bricks absorb more heat than white bricks or cement. You can incorporate bricks into the structure of your greenhouse by using them for knee walls, flooring, or any other sun-exposed areas. Bricks placed directly behind the greenhouse can also protect it from cold winds while absorbing sunlight. The stored heat will be radiated back towards the greenhouse as temperatures drop. Stone and terracotta pots or containers can also serve similar functions while adding a decorative element to your greenhouse.
Large potted plants can also provide some thermal mass and help moderate temperatures. Compost can be used as a thermal mass material as well. Insulating your greenhouse will enhance the efficiency of your thermal mass setup by preventing stored heat from escaping during colder months. Proper ventilation is also crucial to prevent overheating.
Water Pitchers: Effective Microplastic Filters?
You may want to see also
Frequently asked questions
The best way to heat a plastic greenhouse depends on its size and your budget. The sun is the best source of heat as it is free. You can store the built-up daytime heat in thermal mass devices like water jugs or bricks. You can also use heaters powered by electricity, kerosene, or natural gas.
Avoid using plastic sheeting or a tarp as it will amplify the cold instead of warming up your greenhouse. Make sure that the heat is not stuck in one place and there is proper airflow to avoid moisture buildup, which can cause mould.
You can increase the thermal mass in your greenhouse by using materials with high thermal mass like water, soil, clay, stone, bricks, and ceramics. These materials will catch and store the heat energy from the sun during the day and slowly release it at night.
You can use portable forced-air heaters, oil-filled radiant heaters, infrared heaters, or heaters powered by natural gas. If you are using kerosene heaters, make sure they are vented.
