RV air conditioners

I had 2 Carrier V's heat pumps in my 2011 Open Range. They were not very reliable. From what I heard is that Open Range started manufacturing at about the time Carrier was getting out of the RV business and bought out their remaining inventory. Just before my 2 year warranty was up I got the dealer to contact Open Range about replacing them. Open Range agreed to replace them and the dealer called me and said that Open Range had agreed to send 2 new air conditioners. I told the dealer that I had paid for heat pumps when I bought the trailer and I wanted 2 new heat pumps. The dealer got them switched out for the new Coleman Mach VIII heat pumps. They used the Carrier to Coleman conversion kits. The inside unit is still Carrier with the remote thermostats. They cool and heat the trailer great. The only difference is they do not go into standby and automatically turn on the furnace when it gets too cold like the Carrier's did. I have to get up in the middle of the night and manually switch it over. Another future problem is if one of the remote thermostats stops working. They are no longer available.