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4.4 Step 2: Determine design temperature The second step is to determine what the local climate is so you can design a system that meets the home’s temperature needs. You can determine the appropriate design temperature using the climate zones shown in Figure 4.5 as a starting point. Because the temperatures in these areas are calculated from weather stations at the locations shown on the map, there may be some regional variation in this zone. If the location where the heat pump is being installed has a particularly severe climate or microclimate (for example, a sunless or damp valley), this needs to be taken into consideration. In this case, the design temperature may be one or two degrees lower. Figure 4.5 New Zealand climate zones (design temperature in ̊C) NORTH ISLAND NL AK/CM HN TP NP NORTH BP RO EC NM WC SOUTH ISLAND QL IN NORTH ISLAND WN CH CO DN SOUTH ISLAND Climate zone codes Regions Climate index Design temp (oC) Climate zone codes Regions Climate index Design temp (oC) NL Northland 0 5 NM Nelson-Marlborough 3 -1 AK/CM Auckland and Coromandel 0 4 WC West Coast 4 -1 CH Christchurch 3 -4 HN Hamilton 1 -1 QL Queenstown-Lakes 5 -5 BP Bay of Plenty 1 1 CO Central Otago 5 -6 TP Taupo 3 -3 DN Dunedin 5 -1 RO Rotorua 2 -2 IN Invercargill 5 -3 EC NP East Coast 2 -1 New Plymouth 2 1 WN Wellington 3 0 19PDF Image | Heat pump installation Good Practice Guide
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