Here in the US, I think only people who are very, very, well off can afford those kinds of systems. And I assume it only makes sense if you are building a new home. Hence, I've never seen one. But they sound sweet!
Well, altoghther his house wasn't overly expensive - it's a question of preference, I think. He renovated an old farmhouse from the 1700s which he inherited a year ago and which was more or less a ruin (he says he could have built completely new for less money). Now it's an almost passive building, and the energy that he needs is produced by his photovoltaic and solarthermic installation and a small forest nearby which also belongs to him. He can just feed his central heating system with the wood he logs on one or two weekends per year, isn't that great?
The biggest single point in his costsheet for the renovation was "electricity, heating, appliances and control" with altogther some 50.000â‚¬. Not too bad for what he got, though. It must be nice to be almost completely independent energy-wise. Here in Germany you get incredibly cheap loans for this type of renovation from a state-run bank (KfW, which means "Kreditanstalt fÃ¼r Wiederaufbau" (Bank for reconstruction), which was founded after WWII with American taxpayer's money from the Marshall Plan. But I divert...). Think of 3.5% interest fixed over 20 years...