During the day, greenhouses welcome warmth from the sun, allowing them to stay warm without difficulty. At night, the lack of sun means that heat rapidly escapes from the greenhouse space, forcing greenhouse owners to find alternative methods for keeping their plants warm. Retaining the heat gathered during the day for recirculation at night allows the space to keep an adequate temperature regardless of the hour.
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Things you need
- Dark paint
Paint the outside of each barrel in a dark colour to absorb and retain more heat, or otherwise cover the barrels so they are dark on the outside. Heavy black fabric, sheeting or butcher paper will also work.
Place the water barrels in the area of your greenhouse where they will receive the most sun. Gaining enough sun exposure to thoroughly heat the water is essential. Make sure the water barrels are not touching the walls of the greenhouse, as this will draw heat away from them.
Fill the barrels with enough water to heat the entire greenhouse. More water will provide more heat, provided that the water is heating adequately during sun hours. Ideally, you should have 2 gallons of water for every square foot of space in your greenhouse.
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