SIA Norm 384/2 Wärmepumpenheizungen
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The Swiss Society of Engineers and Architects (SIA) sets out the requirements for planning heat pump heating systems in standard 384/2. It governs sizing parameters, interfaces with the building, and measurement and testing rules for commissioning. For homeowners, the standard is a mark of quality: hiring a planner or installer and insisting they follow SIA 384/2 lowers the risk of a poorly sized system.
The SIA standards aren't free, but they can be purchased through the SIA website. Most homeowners don't need to read them directly; it's enough to ask the company you hire whether they follow the standard and fill out a compliant protocol at commissioning.