This company was subcontracted to install a geothermal open loop system with two units, one upstairs, one downstairs. They did not test for hydrogen sulfide or even recommend that the water be tested first and as a result both units completely failed after 3 years and will have to be replaced with new units. The manufacturer also voided the warranty. Trying to get this problem resolved with Sertech has been impossible! They refuse in every way to be held accountable for this. The installation manual clearly states that no hydrogen sulfide is allowed. They either did not read it or they just ignored that. They failed to properly install the system and WILL NOT do what is needed to correct their mistake.