Let's agree to disagree then. I can only tell you that my heating cost is now considerably lower than it was before. That the government even subsidises people who are willing to invest into converting their houses into "low energy houses". Why would they do that if it was useless and would even consume more?

And most of all, I know of several people who have actually done the effort of keeping record of the expenses when then did the on/off method, then did the home upgrade, changed to low-energy and constant temperature and again kept record or their monthly costs. Even though the cost of energy had gone up since the year before (as it always does every year) they noticed a considerable lower monthly cost than before. Are all those people lying then? I don't believe this, because I've noticed the same thing myself.