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Heat Pump Files

A series on HITACHI heat pumps covering questions and answers on Sound, Efficiency and the Defrost Cycle.

A great resource for installers and retailers.



Understanding Sound

There are many misconceptions about the amount of sound heat pumps make and many different claims from manufacturers about what their units do. This document is provided to help users understand this data and make informed decisions on what heat pump they should get. Read more

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Understanding the Defrost Cycle

During winter months many heat pumps will need to go through a “defrost” cycle during operation. Often this has not been explained well before installation, which leads to a lot of confusion about why the heat pump is not working. This document is provided to help users understand the defrosting cycle and address any concerns. Read more

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Understanding Efficiency


When you choose to buy a heat pump, one of the main reasons you do is because they are very efficient. But not all heat pumps are created equal, so it’s important to understand how to find the efficiency of a heat pump and select the model that gives you the highest efficiency. Read more

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Understanding Star Ratings


Star labels must be displayed on all heat pumps sold in New Zealand and are supposed to show in an easy visual way how efficient each heat pump is. Unfortunately the rules for determining star ratings have changed a couple of times recently, causing a lot of confusion. If you compare two heat pumps under different scales of star ratings you will get a misleading picture. This document is written help explain the changes and make star ratings easier to interpret. Read more

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More than 60 years of Temperature Control

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