[Festus2]

There is a warning about altitude's effect on the operation of some Norcold fridges and it does state in the Owner's Manual that you may run into difficulties at altitudes higher than 5500 ft. It seems that most Dometic fridges do not have a similar warning and do not experience the same kinds of problems in higher altitudes.

I believe that propane fridges can be adapted by adjusting the size of the orifice to allow them to operate more efficiently at higher altitudes. It would make sense that, because of the lower oxygen levels at higher altitudes, anything that operates on combustion would be affected and some adjustments might be necessary.

Portable propane heaters such as Mr. Buddy also have mentioned that altitude may have an effect on the heater's operation. While most users have not had problems some have and have had to replace the orifice with a different size that allows the heater to function properly.