I've got a 1,400 sq ft ranch home on a slab that currently has an air-source split system HP. The indoor air handler is in our utility room which is about in the center of our house where the washer and dryer are located. I know that I could go with a split sytem geothermal unit, but I really like the idea of having a packaged unit with all the components out of the weather. My question is how to bring the loops into that space. Is it best to make a penetration outside of the home, run the piping up walls and through the attic to drop down into the mechanical room? Or is there a way to horizontally bore under the house and come up through the slab in the utility room? Obviously a basement would be ideal, but we don't have one in our situation. Any feedback or experience with this would be appreciated! Thanks!