From a homeowner's perspective, the challenge with putting in heat pumps is that they need a different radiator system.

从房主的角度来看， 安装热泵的挑战在于他们需要不同的散热器系统。

NOAH, BROOKLYN RESIDENT: Right, so that we had a radiator system, the radiator was either just hot, extremely hot or non-existent. My bill has significantly been a lot cheaper.

我们之前有一个散热器系统，那个散热器要么很热，非常热，要么根本没用。现在，我在这方面的花销明显便宜了很多。