Of course it is. It is Solar Energy, with the most direct and material-saving way for homebuilders to heat. Just because you don't put it in a pipe, battery or a tank doesn't mean that it is not DIRECTLY doing what everyone else does with 'Ancient Sunlight', Oil, Gas, Wood, Coal, Nuclear (Ancient 'Starstuff'?)

But it is this very illusion that energy has to seem like 'stuff' or be run with some kind of machine, or be a quantifiable market item- if even just the charge on a battery.. to be considered energy at its most essential, which is to say, energy being used for what we need. Most importantly, Tommy's houses are NOT having to burn nearly as much of the other stuff.. so it is 'dirty-energy spared'. (And I'm not put off by the arguments of how 'someone else' is just going to use it then. It's not a cause/effect relationship)

Bob