Indeed, one could do this, especially if you're building a new house. And there are many quite easy ways to reduce energy consumption.
Our dear Dutch government has even a campaign out to convince people to isolate their windows (double glazing). Of course, this being government, they also have a campaign to convince people to keep windows open at all times for circulation.... And they cut the tax bonus for people who want to put up solar panels. And to top it off, they coupled the price of natural gas (of which we have quite a lot, and is way more environmental friendly that oil or coal) to the price of raw oil which results in, as a former economics teacher of mine once said, "the price of gas rises if the price of oil rises because of this connection, and rises as the price of oil falls to compensate".
But all that said, there are quite a number of ways to minimise the use of "new" energy (think oil etc); solar energy, wind energy, earth warmth, storing solar heat, insulation and what not. What would help I think is if the government would help these things by way of subsidising, funding etc. As long as “alternative” energy is more expensive than oil, coal or whatever, it will not get very far, I fear.
In the face of the fact that oil, gas and coal will run out in a while perhaps alternatives will present themselves. In perhaps unexpected ways. And with unexpected results. Think how our society changed when we got coal power (steam engines) and when we got electricity, or when we got oil (nuclear energy I hear you say. Yes, that changed our world too).
Nuclear fusion, matter/antimatter, or something we haven’t even thought of yet?