Recent Review: Issues during and subsequent to the installation: 1. The drilling work was subcontracted, The drilling was conducted during a period when I was not home to observe. That was not an issue. However, upon return a week later, I found a large area of drilling residue on the grass. It had dried to a concrete like layer between 1/4" and 1/2" thick. It covered an area twenty to forty feet in diameter around each hole. A trench was later dug to connect the drilled holes. When that trench was refilled much of dried residue was scraped into the trench. 2. A trench was dug to install the refrigerant lines between the drilled holes and house. Refrigerant lines were installed, and the trench refilled. The fill overflowed one to two feet higher than the original surface of the lawn. I was told this was to be expected, that the fill would settle to ground level. The summer has been very dry. With hand watering the fill has settled about 50% in 6 months but certainly not enough to allow replanting of the grass. 3. The trench was hand dug under the foundation to allow connecting the geothermal refrigerant lines to the geothermal unit. Before refilling I asked that additional effort be made to waterproof the under-foundation trenched area. Three months later, after a very heavy rain, standing water appeared in the crawl space. I was hoping this issue would be resolved when the trench fill has fully settled. I have not yet asked for assistance. I have been very impressed by the professionalism of Fowler Heating and Cooling. This includes all workers, and the sales staff personnel. Prior to, during installation, and in follow-up service to this new geothermal heating and cooling system they have been excellent. That is not to say there were no installation or service problems, but those that have occurred have been very professionally handled.