The Recusol™ is a sustainable and cheap central air heating system, which consumes only energy for a small fan, which in most cases already is available in a building. The Recusol™ is a recuperator and a solar collector that recovers both energy from waste ventilation air and from (sun) light....

A femtholon represents mass and is a hole in the substance that carries light. At severe collisions light can create femtholons and can orbit around them. The femtholon is a stable particle if the light wave can form a stable standing light wave, from which the forces are in equilibrium with the forces to maintain the hole.

A Solar Pond Tower is a combination of a Solar Tower, a Solar Pond and a Hurricane Tower, taking the advantages of all of them. The largest advantage comes from the application of the cheap heat generating Solar Pond, which is far cheaper than the large solar heat collecting green house of the Solar Tower. It is estimated that the Solar Pond Tower can produce power at a cost of 3-5 €ct/kWh.