Hello, just installed last week a new 4 ton trane TVGX with 5 vertical loops and variable speed flow center. I went ahead and had installed the buffer tank for the desuperheater as well as a hybrid heat pump water heater. This is for a 3900 sq ft (including finished basement). I am coming from an 80% efficient propane furnace. Just thought I would introduce myself and start a thread to share my experience.