How to Heat Greenhouse Without Electricity?

The Best Guide How to Heat Greenhouse Without Electricity 2022 Greenhouse

How to heat greenhouse without electricity? Are you in possession of a large or small greenhouse that does not have electricity, and you are thinking about how you can heat the greenhouse in cold winter weather without electric power?

Even if you’re in a region that sees very little or no snowfall, it is likely that at some point or another you’ve had to clean your sidewalk, driveway parking lot, or any other hard-surfaced surface that could be covered by snow or ice.

If you’re looking to make use of the energy of nature to keep your greenhouse warm even when the outside weather is snowy and cold but you don’t have the power to your greenhouse then you’ll need to learn how to heat your greenhouse during winter without electricity.

I’m about to show the most unexplored (yet quite easy) methods of heating the greenhouse during winter… and… the best part is that it isn’t even requiring electricity!

These techniques were employed by the first farmers, and are employed in many greenhouses today including mine.

There are numerous advantages when you plant your plants in greenhouses. One of them is that it allows you to cultivate plants during winter, which is when you are unable to cultivate them in your normal garden.

Furthermore, it assists it to let the plants develop faster since they do not have to be restricted by temperatures that are cold.

Let’s imagine you have an outdoor greenhouse, and you experience extremely cold and wintery outside. What’s your first thought?

Many wonder whether it is possible to heat greenhouses during winter months without electricity so that they can prolong the time for growing.

The good news is, it’s quite feasible. Here are six simple steps you can follow to ensure your greenhouse is up and running before the date of the last frost.


How to Heat Greenhouse Without Electricity?

A greenhouse temperature is crucial due to a variety of reasons. One reason is that plants thrive when the temperature during the day can be between 70 to 80 degrees Fahrenheit.

Another factor is the greenhouse needs to serve as an environmental management system for the plants. The greenhouse should be maintained at the same temperature and humidity so that plants don’t get surprised by sudden fluctuations in greenhouse temperature.

On average an average greenhouse cost $11,161 to construct. The cost can vary depending on the dimensions, materials employed, and the style of the garden. The larger the greenhouse, the higher it will cost. Greenhouse heating costs will be larger too.

Winterizing To Heat Greenhouse

Winterizing To Heat Greenhouse

When the temperature begins to drop there are a few things you should consider making changes to your greenhouse to prepare for the long, cold winter ahead. It will also decrease heat loss.

A few of these are cleansing the structural elements of your home and caulking any cracks or gaps and installing insulation.

It’s an excellent idea to examine all joints and seams at which the various pieces of your greenhouse join one another. If they’re not sealed properly It is possible that there’s a good degree of air loss.

Sealing the seams and joints is crucial. There shouldn’t be any drafts to enter or exit your greenhouse.

A draft is the main thing that can cause the temperature of the greenhouse area to fall. It’s due to the movement of cool as well as warm air from one location to another.

Winter Greenhouse

In this case, it will mean that it will drop the temperature inside the greenhouse just as cold as the temperature outside.

As you might have noticed based on the location of your greenhouse is located, the majority of the sunlight is filtered through the south-facing side in winter.

All the other sides are able to be covered with insulation to keep the heat longer. How can you insulate a greenhouse?

Insulation is available in a variety of kinds. You can choose to use bubble wrap sheets of plastic or cardboard or styrofoam.

The best solution I’ve discovered is to use plastic cards because it stores the same amount of heat as cardboard, however it doesn’t absorb moisture.

Whatever you choose to use must be of good quality and not be put on the sides facing south.

Factors That Impact the Price of Heating

Factors That Impact the Price of Heating

In addition, depending on the material you’ve constructed your greenhouse of, like the three tiny pigs constructed from straw bricks, sticks, or sticks–different materials are able to hold heat and last longer than other types of materials.

The cost of maintaining greenhouse temperature can vary according to factors such as:

  • the dimensions that your greenhouse is (primarily the square footage),
  • glazing materials,
  • insulation,
  • your climate and the degree of cold that it experiences in the area you live in,
  • how warm you’ll need your greenhouse to be in comparison to the outside temperature,
  • If you need additional heating and cooling,
  • the need for electricity,
  • or water needs.

For instance, the price of the heating of a small-sized greenhouse — say, just 1,000 square feet, could be between $1,000 and $0 per month. The cost can differ greatly, based on the variables mentioned above.

However, even if you look at the middle end of the spectrum, which is $500 per month for heating your greenhouse. This is quite expensive. Therefore, naturally, you’re thinking of ways to reduce that expense.


How Can We Reduce The Cost of Heating Greenhouses

How Can We Reduce The Cost of Heating Greenhouses

A lot of the methods employed to keep a greenhouse warm are the same methods you can employ in keeping the greenhouse warm during the night.

A self-heating greenhouse makes use of non-electrical, passive systems to take, store, and distribute heat. In reality, “self-heating” is a false description, as naturally, they require the sun’s energy to accomplish this.

Insulate your greenhouse by using compost and thermal mass solar power, other methods you can cut this cost.

Insulation helps retain the heat that you already have and is the best method. We’ve prepared an extensive guide on how to make your greenhouse more energy efficient..

The primary materials you could make use of for insulation are plastic wraps, bubble wrap polycarbonates, and fiberglass.

For heating your greenhouse, without electricity, you can utilize solar panels, thermal mass heating as well as compost.

How To Build A Greenhouse Heat Sink

How To Build A Greenhouse Heat Sink

1. Dig

The size of your sink is contingent upon the dimensions of your greenhouse. The bigger the house is, the larger the heat sink will need to be. In the event that your greenhouse has a typical size, for example, 10’x10′, then you’ll need a larger sink.
perfect and has a 3’x3′ sink.

Place your heat sink in or near the middle of your greenhouse. This is where it can store and disperse heat the most effectively. Avoid placing it close to the walls because it’s likely to quickly lose heat.

Be aware of how deep and where you dig. It is likely that you conducted the necessary research prior to building an indoor greenhouse within your yard (I would hope so! ) But make certain there are no pipelines or electric lines graveyards, dinosaur bones, or subway stations underneath your greenhouse.

If you haven’t begun building your greenhouse yet, take a look at this article to understand the basics of building permits, licenses, and greenhouses.

2. Fill

There is the option to fill your heating sink using any dense and heat-holding material. Common fill materials include brick concrete, concrete, or gravel. Choose an arrangement and material which eliminates gaps between pieces in order to preserve more heat.

3. Ventilate

The addition of piping to your heating sink will help to transport warmer air away from your pit to the greenhouse. Make sure that the pipe isn’t slender or weak, or else the material break!

Also, ensure that you have an excellent airflow system for your greenhouse in order to improve the efficiency of your heat source. Include fans, perhaps solar-powered ones, to aid in the transfer of heat to the heat sink from the point it rises, which makes it more efficient when temperatures drop.

Heat Greenhouse With Water

Heat Greenhouse With Water

Did you know that you could make use of water to warm the greenhouse? This is a typical method to boost the warmth. This is accomplished through filling black water jugs with water, barrels of water that are black, or black tubing with water.

They require to be black since black absorbs the heat of sunlight during daytime. This heats the water and, at night, the water cools down, it lets that heat out to the climate.

There isn’t a lot of heat being released, but enough that it keeps the greenhouse from freezing as temperatures drop to just below freezing.

In addition to only being effective in temperatures that are close to the freezing point outside, the downside of this method is that it doesn’t be effective in the case that the greenhouse doesn’t receive much sun.

If there isn’t any sunlight, it is not able to absorb solar energy, and therefore the water won’t be heated.

Additionally, if you reside in an area with harsh winters, and the temperature falls below zero, it will be difficult to keep your greenhouse warm.

How to Make Use of Humidity to Keep Temperature Stable

How to Make Use of Humidity to Keep Temperature Stable
A hot house filled with plants which thrive in a hot, humid environment.

While temperature is essential for plants but humidity is an important element. Humidity is a way to keep a temperature that is less volatile between day and night.

The bulk of water in the air works similar to a battery, storing heat during the day and then releasing it at night.

This way, more humidity reduces the risk of large temperature swings.

In addition, by limiting the temperature fluctuations there is less chance of shocking plants and even killing them.

Beware of Excessive Humidity

There’s one drawback due to being too humid that it could make plants more susceptible to disease.

To reduce the humidity, you’ll have to let your greenhouse air dry. In winter, this could be difficult, because you’ll want to keep the heat that you already have.

Wait, what? Isn’t it similar to having my windows open in the very cold climate?

It’s a little. It’s not necessary to ventilate the greenhouse all the time, but only when the humidity is very high as 80-90 percent. The majority of the time, it’s during the daytime in the summer, when it’s warmer.

To let the air circulate, you can make use of fans or vents that can be opened manually to get rid of excess humidity only when you really need to. The idea is to circulate the air and get rid of the extra humidity.

Using Compost to Heat Greenhouses

Using Compost to Heat Greenhouses

Compost is nature’s heat source! Well… I think you could say that the sun acts as nature’s heat source however, compost is nature’s second heater. It can be kept in your greenhouse. The microbes that take place during decomposition generate a significant amount of heat that slowly radiates out of the pile.

The process of composting your greenhouse takes up some space, and may not be suitable for smaller buildings. If you are able to fit the space for a compost bin, you can increase the thermal mass by three times as well as sustainable waste management and even create a useful soil amendment!

Insulating a Greenhouse – Hang On To The Heat You Already Have

The greenhouse must be insulated to preserve the temperature you have already and also reduce the amount of power that you require to power your greenhouse. The most commonly used method to achieve this is to apply:

  • The plastic used for greenhouses,
  • bubble wrap, or
  • glass.

Bubble wrap, particularly the kind that is designed specifically for greenhouses is an excellent method to hold heat in and enhance the sun’s heat.

If you’re insulating your greenhouse, ensure there aren’t any gaps between the insulation layers and edges.

Utilizing two types of insulation can also be advantageous. For instance, you could utilize plastic as the outer layer and then use bubble wrap for the interior.

The insulation made of plastic will become crack and break in temperatures that are cold. It will last around three years. The typical lifespan of bubble wrap is about a year. Additionally the regular bubble wrap is not as efficient as bubble wrap designed especially for greenhouses. Bubble wrap specifically designed for greenhouses lasts around 3 years or more since it’s designed to withstand the sun’s ultraviolet light.

Straw, specifically straw bales can also be a great source of insulation and also are also beneficial because they’re totally natural. They could also serve as benches, shelves, and work tables.

You can Insulate Your Greenhouse to Keep it Warm

Your greenhouse must be winterized the same way as your house. This means that you must:

  • Make use of the bubble wrap to cover greenhouse panes.s
  • Fill in all gaps and cracks in the frame seams using Weather-proofing tape.
  • Create internal curtains using bubble wrap to separate zones for you to “store” more warmth.

Cover Up Your Greenhouse Plants to Keep Them Warm

Protect your plants! Tying your plants for the night using wool or felt blankets can be efficient and cute. Be cautious not to squash delicate flowers or stems with heavy-duty fabric. Remember to take off any cover that blocks light in the morning otherwise, your plants won’t receive any light.

If you’re looking to know more about how to grow plants in an indoor greenhouse in winter, take this guide for the time to read.

You can also utilize Bubble wraps as a way to cover plants or to cover containers. The advantage of bubble wrap is the fact that light could get through if you don’t remember to take it off or you want to cover it during extremely cold, daytime temperatures.

Heating With Hot Ashes

Okay, so even though I utilize the majority, of the methods I’ve discussed in the past to heat my tiny greenhouse garden, This is the one that is my absolute favorite greenhouse heater for those cold winter nights.

Use a bucket made of metal and place hot ashes into the bucket. Set it onto the ground in the middle of the greenhouse. One thing you must consider is that you must make sure there’s nothing in it that could ignite a fire since the bucket is hot.

We have a wood-burning stove that is used in winter. This doubles for cleaning the stove as well as heating the greenhouse in the process.

But, if you don’t have a stove made of wood or fireplace, you can use the ashes from a fireplace pit or barrel for greenhouse heating.

It will generate heat significant for several hours, and eventually cool. Based on the area you live in and the temperature you will be able to place this in the greenhouse during the night.

Personally, I have found that using the methods mentioned above will keep it above temperatures that would freeze in the greenhouse (when temperatures are in the 20s in the outdoors) through the morning, such as around 5 am.

As I am an early riser I remove the bucket and place it back in the greenhouse around 5 am.

Using The Earth To Heat

The earth can be used to warm greenhouses, however, this method works only in the case of a huge greenhouse.

There are two ways for using the earth to keep the temperature in your greenhouse at or above freezing. The first option is to sink your entire greenhouse into the ground.

In the ground in such a way that the bottom portion of the greenhouse has been lowered lower than ground level by several feet. This will give you the most effective results the greater the depth or the higher the greenhouse is submerged to the ground.

Another idea is to dig a hole and put a PVC pipe underneath the previous one. You’ll want the PVC to be placed in the shape of a U. Similar to the top of the football goal.

The bottom portion is underground and is heated by the temperature of the earth. The heat then rises from the open ends and warms the greenhouse.


The second idea is to make use of chickens.


Chickens for heating a greenhouse?!

It may seem a bit crazy however, chickens can provide heat to greenhouses.

It has two advantages that are beneficial to the plants and another for the chickens. Chickens generate body heat and carbon dioxide which are beneficial to plants.

Chickens are also known to eat insects that can harm your plants. The greenhouse can benefit chickens as it allows them to create more eggs within a secure setting.

How To Heat A Greenhouse Without Electricity Step-By-Step

There are two major ideas regarding the greenhouse heating process without electricity.

The first method is to capture the sun’s warmth when sunlight strikes a dense substance known as thermal mass. This includes water and rocks. Thermal mass (heat storage) absorbs lots of heat during the day and releases that warmth when temperatures fall at night. Utilizing thermal mass in a greenhouse can be simple since it already gets lots of sunlight.

The second idea is composting. This is because compost piles create heat when microorganisms that live within them break down organic material to produce compost.


  • tiny stones, or even gravel
  • white paint
  • black paint
  • paint brushes
  • cinder blocks
  • container(s) of water container(s)
  • Ceramic pots
  • wire mesh
  • organic substances (leaves and twigs.)

Step 1:

Install smaller stones and gravel inside your greenhouse. This forms an insulation layer that is clean and dry.

Step 2:

Paint all surfaces of your greenhouse, on which you wish to reflect light onto, using white paint.

Step 3:

Place your cinder blocks in the manner you would like them to be used as support for water bottles or for tables or benches. The cinder block will absorb the heat of sunlight that touches them.

Step 4:

Paint the cinder block black. This improves the effectiveness of their absorption of heat.

Step 5:

Place at least one of the water tanks in your greenhouse in the areas where you would like them to absorb and release heat. Then, fill them with water.

You might want to paint these water bottles black too.

Step 6:

Utilize ceramic pots. They absorb heat and release it similar to cinder blocks.

Step 7:

Set up a wire mesh in the location you’d like to have the compost pile. Be aware… the compost heaps are known for producing huge amounts of heat, particularly those with large amounts… The compost heaps are prone to spontaneously explode into a blaze, be aware of what you’re doing when you have a huge heap of compost pile within your garden, particularly when it is connected to your home!

Step 8:

Incorporate compostable material into the compost bin, such as the clippings of plants, fallen leaves, and weeds. Make sure to keep it damp.

Step 9:

You can enjoy a rise in the temperature of your greenhouse without increasing your electric bill!

Look also – How To Cool A Greenhouse – The Best Guide 2022


In the end, it is true that a greenhouse can provide all year round fresh food, even in the coldest temperatures. It can also provide a secure refuge for delicate plants or flowers, which might otherwise be unable to thrive in the cold winter months.

We’ve provided a variety of suggestions on how you can have a winter greenhouse, and how to use the greenhouse to heat it during the winter months without electricity.

How To Heat Greenhouse Without Electricity FAQs

How can I heat my greenhouse for free?

In order to heat your greenhouse during winter the most effective methods are to make use of insulation, store thermal energy, and use compost (since compost produces heat). Each of these methods is effective to create heat and hold the greenhouse’s heat.

What is the cheapest way to heat a greenhouse?

It is, without doubt, the most efficient and simplest method to warm the greenhouse you have is to make use of an electric heater of some kind likely a specially made greenhouse heater or space heater. There are plenty of choices in the field of electric heaters, the cheapest being the eco-tube variety.

How do you heat an unheated greenhouse?

1. Invest in an electric fan heater. Fan heaters are extremely efficient in circulating heat even in large and medium structures,’ says our team from Hartley
2. Botanic (opens in new tab). …
3. Larger structures can be heated by using an electric boiler. …
4. Make an attractive bed. …
5. You can try using a heat source that is an air- or ground-source heat pump. …
6. Keep it insulated. …
7. Try solar energy to make passive solar heating.

How do you heat a greenhouse at night?

All you need to accomplish is simply apply black paint, fill them with water, and then cover them with the edge of your shelves. They’ll absorb the sunlight’s heat during the daytime (make sure you place them directly in the sun) and then release it in the evening.

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