AC Replacement For A 2005 Keystone Hornet With A Coleman Mach Unit

Updated 09/26/2025 | Published 05/03/2025

Question:

Could this replace my AC unit? I have a 2005 hornet by keystone with one unit in the middle made by Coleman mach

asked by: James M

Expert Reply:

Hey James,

This particular Advent unit, # ASA39YR, is great because it comes with the necessary plug and play adapter to work with Coleman Mach units. So it should be a direct replacement for you. I will add, this Advent unit will not be compatible if the control box is built into the existing AC unit. I recommend checking the wiring of your existing setup to see.

Do you happen to know the exact model of the current AC unit on your trailer? I can double check for you and see if it is going to work with that specific unit you have.

expert reply by: Nick S

Nick S.

9/26/2025

Hey James, did you have a chance to check the wiring of your current AC unit? I'm asking because I want to make sure you get the right solution for your setup.