Defrost & Low-Temperature Operation

Heat Pumps

Heat pump operation below 0°C: what changes in the compressor and refrigerant circuit

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Heat Pumps

Base pan heater and defrost drainage: why water freezes under the outdoor unit

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Heat Pumps

Water temperature during defrost: why it may drop temporarily

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Heat Pumps

How low outdoor temperatures affect the COP and power of a heat pump

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Heat Pumps

Four-way valve and defrost: what is its role

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Heat Pumps

Defrost sensors: how the heat pump decides when to perform a defrost cycle

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Heat Pumps

Defrost cycle in a heat pump: exactly what happens step-by-step

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Heat Pumps

Why does the outdoor heat pump unit freeze during heating

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