Technical FAQ’s



HVAC Basics

Question: What is a BTU?

Question: How can I calculate how many BTUs are needed to heat water?

Question: How are the power consumption and the power factor of a 3-phase motor calculated?


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System Sizing

Question: In a humid climate, how can you assure proper dehumidification in the cooling mode?
Question: If a Direct Energy system is sized to serve a large heating load and a small cooling load, will it quickly satisfy the sensible cooling load, then short cycle and not remove adequate moisture?


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Earth Loops

Question: For the Vertical loop (1.5 per ton), the specification is 1.5 x 100′. Does this mean the loop is 150′ long? Or does it mean that 1.5 times as many loops are required?

Question: Will burying the loops in subsurface water allow for a better heat exchange and require fewer loops?

Question: What kind of soil requires the Cathodic Protection System (CPS)?

Question: Is maintenance required for the CPS?


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Question: Should the manifold pit be excavated before the bore holes are drilled?


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Question: If I only need air-conditioning, what kind of model would you suggest? Will I still require the heat pump?
Question: What is the COP for the Direct Energy system at various outside temperatures and for various applications?
Question: Can you describe the Active Charge Control (ACC) and its function?
Question: The diagram for the Direct Energy water heater application seems to require both your system and a separate water heater. Why do you need both a storage tank and water heater? Please explain the radiant floor and house supply hot water. Is the supplemental water heater needed because the recovery time of your geothermal system is too slow?

Question: What is the highest sustained room temperature in the heating mode and lowest cooling temperature in the cooling mode?
Question: Why is it economic to use supplemental heat to “top off” the water temperature?


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