The energy to run stuff in the building adds to its heat load no matter where the energy came from, so it’s a net wash.
That isn't the point. This guy is trying to sell stock to investors by offering variations on perpetual motion machines, which he has carefully trademarked, but seems not to have patented, or he would have claimed those too. (hint: the US Patent Office does not patent perpetual motion machines.) The principle is quite simple really. Every engineering student learns the first law of thermo-dynamics - there is no free lunch. The second law is that you cannot even get a fair break.
Anytime someone like this has a claim that sounds like he is not giving mother nature her due, he is most likely cheating the first or second law.