Hi Dave, we have 2 of the Dometic "Brisk Air" 13,500 roof mount units on our 6 year old coach that has worked very well for us in hot climates. They're cool only, not heat pumps. If and when time comes to replace them I will seriously consider the Carrier Units. A couple of features I like about the Carrier is the powder-coated base pan, the slinger wheel reduces condensation run off plus many other features. Heres a link to the Carrier website:http://www.airv.carrier.com/details/...TI1987,00.html
Also here's the site for the Dometic: http://www.dometicusa.com/climate.php?product=51
Really don't know anything about the Colemans other than I'm sure they're also a good unit.
Good luck with your choice, Jim