Which HVAC system uses underground temperatures as an operating factor?

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Study for the NOCTI Heating, Ventilation, and Air Conditioning (HVAC) Test. Practice with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Which HVAC system uses underground temperatures as an operating factor?

Explanation:
Geothermal heat pumps use underground temperatures as an operating factor. A loop of pipe is buried in the ground, where temperatures stay relatively constant year-round. In heating mode, heat is drawn from the ground into the refrigerant; in cooling mode, heat is transferred from the building into the ground. That steady underground temperature makes the system more efficient than others that rely on outdoor air or combustion. Air-source heat pumps depend on outdoor air and lose efficiency in cold weather; conventional furnaces burn fuel; water heaters provide domestic hot water and don’t use underground temperatures.

Geothermal heat pumps use underground temperatures as an operating factor. A loop of pipe is buried in the ground, where temperatures stay relatively constant year-round. In heating mode, heat is drawn from the ground into the refrigerant; in cooling mode, heat is transferred from the building into the ground. That steady underground temperature makes the system more efficient than others that rely on outdoor air or combustion. Air-source heat pumps depend on outdoor air and lose efficiency in cold weather; conventional furnaces burn fuel; water heaters provide domestic hot water and don’t use underground temperatures.

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