Pros: It's geothermal
Cons: Noisy operation
My major complaint is that the unit runs loud despite the fact that the product literature touts the unit's "noise-free" operation. I have been awakened in the middle of the night by the whoosh of the unit coming on. My previous unit (a 20-year old gas furnace) was much quieter. Granted, it COULD be a faulty unit or installation, but so far both the installer and the manufacturer have been rather unresponsive to my complaint. More likely, the problem is in the design. I will be looking at the duct work as well. In any case, they need to remove the "noise-free" badge from their product literature as it is an obvious lie.
The savings so far have been great. My last utility bill was $150, which is about half of what I typically paid around this time of year with my previous system.