The Estimated Seasonal Performance Factor (SPF) indicates whether a heat pump equipment makes a net use of renewable energy, exchanging against air, water, land, etc. In this way, part of the energy generated by the HP comes from renewable sources, but not in any amount, the Regulations and Standards indicate the lower limit from which a HP equipment can be considered renewable.
The concept at first glance seems complicated, but when you get into the philosophy of this criterion, you realise that we simply have to produce more thermal energy than was originally needed to carry out the process. We obtain energy from renewable sources.
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