"G&M" wrote in message
...

"Rick Dipper" wrote in message
...

Thanks Ian, I now see a second problem of overinsulation, overheating.

This can happen in some very modern highly insulated houses but for most
of
us doing up existing houses it ain't going to happen. There will always
be
thermal bridges and so on leaking heat.

And if it does happen all one has to do is use low energy lighting and so
on.

or open a window