IMM wrote:

"Franz Heymann" wrote in message
...


I have been reading about the immense progress being made in fuel cell
technology for more than twenty years now. Why are they not yet in daily
use in every household?


Why isn't every new and rennovated houses built to superinsulation and
passive solar standards, virtually eliminating a heating system? Not rocket
science and many examples are all over the world right now, so not airy
fairy ideas at all. It would cost the taxpayer nothing to implement.



Because super insulation is useless without other means to reduce
ventilation losses.

You need things like heat exchanges on ventilation - this gets very
expensive.


It is arguable that the energy used to build all this stuff doesn't

get paid back in a sensible timescale.


Curemnt insulation levels are at around ten times what they were in say
the 1950's, with windows being perhpas 3 times better.

We are reaching teh law of diminishing returns on insulation.