Homa (synonymous with Yajnya) is from the Vedic science of bioenergy; the process of removing the toxic conditions of the atmosphere through the agency of fire.
You heal the atmosphere and the healed atmosphere heals you.
This is the central idea in Homa Therapy.
The most basic Homa is called AGNIHOTRA and is tuned to the biorhythm of sunrise/sunset. Performance of Agnihotra on a regular daily basis establishes the healing energies necessary for a healthy environment. More information here.