I bought my current home a little over three years ago. The home is about seven years old and has a ClimateMaster Tranquility 27 system. The previous owner had the equipment "serviced" by the company that originally installed the system when the home was built. Since I have no prior experience with geothermal equipment I signed up for the company's semi annual service. The serviceman come out at the beginning of the heating season and the beginning of the cooling system and "do their thing". I've recently started trying out some of the quirks in my system, and have been following this forum. Many of the threads talk about operating information that I have never been furnished at the time of my seasonal service. About all the documentation that is furnished at the time of the service is that the filter was changed and a statement that the system is operating properly. Can someone explain: 1. How frequently should a geothermal system be "serviced"? 2. When should the service be performed? (It seems like any system problems are more likely to be visible on very hot or very cold days----not in the first week of the heating or cooling season.) 3. What steps should the technician perform during this service? 4. What information should the homeowner expect to receive at the conclusion of this service?