There are two forms of tinnitus: objective and subjective. Objective tinnitus means that both you and other people can hear certain noises in your ears. This is usually due to abnormal blood vessels in and around your ears.
The main advantages of solar energy are that it is clean, able to operate independently or in conjunction with traditional energy sources, and is remarkably renewable.
For energy conversion efficiency (what most people are really interested in when asking about the most efficient home heating system), we can start from the assumption that solar is free, and geothermal is almost free, since up to 4 times as much heat energy is extracted from the ground as the energy in the electricity that pumps the heat out.