I just replaced both my older Duotherm 13.5K units with the Penguine II high capacity heat pumps 15K units. Best deal I could find at the time was PPL, it cost $150 to ship the units but still cheaper then any other place I checked. Units took ~5 days to get.
I decided to upgrade to the Micro Air Easy Touch thermostat. It was plug and play. It is Bluetooth so I can check/change the thermostat via my phone, very convenient. It is also internet capable, I can check the settings anywhere I have a signal with the hotspot in the RV working. This works great, I can turn the heat or AC on from anywhere.
My old units were ~20 years old, I had problems with the front ~5 years ago and the back started to act up. Decided to just bit the bullet and change both out.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi