In certain cases, this would cause an energy drain rather than boost. Infrared light is pretty much the electromagnetic form of radiant heat (thermal radiation). In many places in the world, it is usually the times of cold that more energy is used; as the heat deltas of a cold winter are much greater than the heat delta of a hot summer. So, heat from the sun, as sparse as it is in the winter, is still radiating into your house. Blocking it, and turning it into electrical energy, then turning that back into heat energy is most surely a loosing proposition. Depending on the needs of the user, this might inflict a greater cost than cost savings. So while there are times that blocking thermal radiation and turning into electrical energy would be of worth, it is a regional issue that has a lot to do with local climate swings and average annual temperature; the colder the average temperature, the more of a waste this could be.