3 ms·

Can you say more about this? Heat pumps don't by design ventilate or exchange with outside air. That would be the role of an ERV or HRV or just an exchanger.

• anovikov 2y ago
  That's when we are speaking of an individual system installed in a flat. When we are speaking of a building as a whole, almost all of the cost of installing either a heat pump or just a ventilation system is modifying a building to install air ducts. Which is sometimes a highly invasive, destructive procedure equalling to a near total refurbishment of a building (so this is typically combined: heat insulation + ventilation ducts + general refurbishment, as doing any of the 3 separately won't be much cheaper than doing all 3, anyway). Then you have a single large pipe where a large mass of air enters and and another one where it exits the building. Then it's comparatively not at all hard or expensive to add a massive heat pump so the inlet pipe passes through it (and a heat exchanger between outlet pipe and inlet before, so-called regenerative heating, which will achieve some of the same result, but for free). That's why i think that buiding-scale ventilation systems without heat pumps make no economic sense. They mean leaving a very low hanging fruit, hanging.
  • eru 2y ago
    > That's why i think that buiding-scale ventilation systems without heat pumps make no economic sense. They mean leaving a very low hanging fruit, hanging. That makes some sense. But your call for criminalisation is silly.