How to Keep the Greenhouse Warm
Using Bubble Wrap to Insulate the Greenhouse
Insulating a greenhouse garden with a bubble wrap will ensure heat doesn’t escape away. For a better insulation, buy a wrap with bigger bubbles. You should also cover all doors and windows to ensure heat doesn’t escape, especially during the winter. This practice will not only keep the greenhouse warm, but it will also reduce the cost of heating.
A small heater added to the greenhouse can help regulate the greenhouse’s temperature, especially during the night. The plants can use the carbon dioxide produced by the heater and convert it to oxygen, which is essential for humans.
The cold weather outside will not be able to affect your plants inside the greenhouse if you have a heater installed.
Using Air Circulators Inside the Greenhouse
Heaters will not be enough to provide warmth inside the greenhouse; you will also have to make sure the fresh air being circulated inside the greenhouse is warmed evenly to avoid having cold and hot patches on the plants.
Installing air circulators will ensure there is an even distribution of warm air inside the greenhouse. You can buy an air circulator fan or use the air circulation function from KlimaHeat to mix air.
If you have no electricity in the area, you can protect the plants from the cold weather by:
The bacteria that breaks down organic matter during the compost process generates heat; therefore, adding more compost to the soil will help generate heat that can keep your plants warm.
Add a layer of soil about 3 inches thick to enable the bacteria to create a warm environment for the plant roots.
Using a Double Layer of Plastic Material to Make Windows
Insulating the windows can help the greenhouse retain more heat. Although insulation can block the amount of light from entering, using a double layer of insulation material on the windows can add more warmth inside. As a result, you double the R-value (insulation) of the greenhouse.
Using Black Mulch on All Pathways
The pathways inside the greenhouse or between the planting beds absorb heat. Adding black mulch, or any other dark color mulch, to the pathways will absorb more sunlight and convert it to heat, keeping your plants’ roots warm.
Using Heat to Absorb Barrels
Put black barrels in an area where they can have direct access to sunlight, as they will absorb more sunlight and use that to convert heat that will warm the water inside. As it goes, you should place the plastic black barrels in water.
The warm water created will act as thermal mass and can hold for a longer period, providing warmth to greenhouse plants.
Although they use sunlight themselves, make sure to place the barrels in a way that they won’t block sunlight from reaching the plants. Barrels work well when placed on the northern corner of the greenhouse. During the summer, you should cover these barrels with a white material to prevent them from creating extra heat in the greenhouse.
Building the Greenhouse Partially Underground
Building the greenhouse 4 inches deeper on the ground will help retain more warmth and acts as an insulator against the cold air from outside the structure. During the cold season, the ground will be warm. This provides the warmth needed for the roots of the plant to grow.
If you have a greenhouse building facing the south hillside, it will absorb more heat to warm the ground.
Utilizing Thermal Mass Objects
Using objects like clay, rocks, and bricks can absorb heat when the air circulating inside is warm and release the absorbed heat when the air inside is cold. Therefore, having raised beds made of clay or brick material can absorb heat and use it to warm the greenhouse. You can boost the amount of warmth released by adding black barrel to water inside.
Insulating the Northern Side
If you stay in Northern hemisphere, there is no need to fix glass on the northern side because the sun doesn’t shine on that side. Adding insulators on the northern side will help retain heat inside the greenhouse and prevent north winds from getting inside. In addition, putting a thermal heating mass on the wall can absorb more sunlight.