I agree with the comments below, both on not wanting the inside of a house to be cold, and being worried that the degradation of nanowires would prove in some way to be catastrophic to either human health or the environment or both. Even the breakdown of synthetic fabrics is causing environmental damage that is poorly understood right now. Silver could prove even more problematic to certain life forms.

That said, I'm not sure why this wouldn't just be used in the the insulation of a house directly? If we could drastically improve the insulation of a house without causing a major vapor retention problem, that would do wonders. Of course, glass is a major problem with good insulation, but I wonder if this material could be made into a partially transparent insulating layer that could be applied to glass temporarily?