Glad I found this Company. We had problems with our Geo unit every year when the season changed from heat to air and air to heat. We had a local heating and air person here to work on it at least twice every year. It was getting to be a headache plus expensive. I saw an ad in the RECC phamplet for Allgeier Air, specialist in geothermal units. I made an appointment to service the unit. The appointment was made in a very timely manner and the service tech seemed very knowledgable of the Geothermal system. I've had them service my unit every year since and have not had any more problems.
I highly recommend this Company, especially if you have a geothermal unit.