Knowledgebase
Welcome to the BTL Knowledgebase. Ever since we started lining ponds, creating covers, and helping people with their projects, we've gotten asked a lot of questions. Many of these questions are repeatedly asked, so we put together the BTL knowledgebase to help answer any questions you had about a particular subject. We are adding new questions every month, so continue to check back often!
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Does a geothermal greenhouse work in the Winter?
Yes! A few feet below the surface, the soil is warmed by geothermal energy and maintains a constant temperature year round.
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Can you heat a greenhouse with geothermal energy?
Geothermal energy is free, easily accessible, and well suited to use in greenhouses.
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How deep is a geothermal greenhouse?
Geothermal greenhouses vary in depth, with a comfortable average for horizontal loop designs being 6-12 feet deep, depending on your climate.
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Where does geothermal energy come from?
Geothermal energy is natural heat from within the Earth itself.
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How deep is a geothermal well?
A geothermal well can vary significantly in depth and may even require multiple drilling sites before a suitable site is located.
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Is geothermal energy sustainable?
Geothermal energy comes from the natural heat of the planet emanating from magma layers thousands of feet thick.
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What is a greenhouse's heat sink?
A heat sink is a dense material that naturally absorbs heat during the daytime and gradually releases it in the cool evening.
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What's a geothermal heat pump?
A geothermal heat pump is a specialized piece of equipment that typically uses warm water from underground aquifers to absorb heat and transfer it to a space like a greenhouse or a residence.
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Can you heat a greenhouse from the ground?
Yes! Geothermal greenhouses harness the natural warmth of the earth to supply heat directly to the greenhouse.
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How do you heat a greenhouse without electricity?
Passive geothermal greenhouses can take advantage of physical principals like the thermal flywheel to transfer heat from underground.
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What's the best soil for geothermal?
Moderaly dense, moist soils easily transfer heat and therefore make the best soil type for geothermal greenhouses.
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How do you heat a geothermal greenhouse?
There are several ways to heat a greenhouse using passive geothermal principles, and greenhouse operators typically aren't shy to supplement with no-tech, passive thermal batteries charged by exposure to the sun.
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How does a geothermal greenhouse work?
Geothermal greenhouses work by transferring naturally occurring underground warmth into the greenhouse using circulating air.
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How do you size a geothermal system?
Typically, an engineer will help you calculate an average heat load for your particular home or structure. This heat load will determine how much heat, on average, needs to be supplied to your home to keep it within the desired range.
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What are the disadvantages of geothermal energy?
Geothermal energy is available pretty much all over the globe, is free and is completely sustainable.
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Can you heat a house with geothermal?
Houses can be heated geothermally by pumping cold air above-ground through pipes to soil several feet underground, where the temperature is constant year-round. This heats the air before pumping it back into the house.
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What are the advantages of geothermal energy?
Geothermal energy is cost effective, completely sustainable, and emits virtually no pollution.
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How much does a geothermal greenhouse cost?
The cost of a mostly passive geothermal greenhouse will depend on the size of the greenhouse(s) and somewhat on the topography of the land.
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How do you build a geothermal greenhouse?
Most geothermal greenhouses are built using a passive system, which may be augmented with fans or even a heat pump if necessary.
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How deep does a geothermal greenhouse need to be?
Using passive geothermal heat, pipes are generally buried 6-8 ft below ground, depending on the climate.
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Is geothermal heating cheap?
Other than installation and occasional maintenance costs, geothermal greenhouses are minimally expensive.
What liner do you use in a seasonal nursery pond?
A seasonal pond will be exposed to UV light and frequently changing temperatures during the off-season, a natural clay bed or concrete liner will crack and lose durability during this time.
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What should you line a seasonal pond with?
A seasonal pond will be exposed to UV light and frequently changing temperatures during the off-season, a natural clay bed or concrete liner will crack and lose durability during this time.
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