Digital thermstat

How do you turn on the AC if not via the thermostat?

I have a Dometic single zone LCD, so they are available. I can't attest to replacing an RV thermostat, but my home unit was really easy. I labeled the wires before I disconnected them from the old unit, then matched them up on the new unit. But if you can't control your AC from your old unit, a digital thermometer won't help you unless you can find the wires that do control your AC.

I switched out the T-stat on our previous hybrid and TT. Very easy to do. I like the Dometic T-stat in our current 5th wheel. Couple of links for you:

http://www.rverscorner.com/hunterstat.htm

http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24108995.cfm

Depending on what AC unit is installed, the change out may or may not be "straight forward". First, you need to look at how many wires have been run to the existing thermostat (likely 2 ... hopefully at least 4). Next, since AC involves switching 120 volts as opposed the 12v in a furnace, the control boards included with the ac need to be the "right ones" for "offboard control"... it is likely that your current ac unit has "front panel controls" which usually DO NOT have the "needed" interface. The links posted will help you get thru this. Be careful if you don't fully understand electrical work.

I have a Jayco Jay Feather 24FSB. I couldn't tell you what my units are, but sounds pretty much like the same setup that you have. It did come with an analog Dometic thermostat. Last year I had the trailer in the shop for hail damage and had the repairman replace the thermostat with a digital thermostat. It is also a Dometic, and so far I have been very pleased with it.

Extremely easy to do if you stay the same brand control, took lease than 10 min. Is yours a Coleman controller? There is a direct replacement for mechanical to digital. It is night and day on how comfortable your TT will be.

Thermastat is a atwood with just 2 wires going into it so i guess if i went digital it would only run furnace and not ac

yep it can only run the furnace then... you would need to run additional cable (eg. telephone wire type "jkt" with at least 4 conductor... 6 max). The conversion can be done with just one additional wire... that's what I did, just ran an extra wire which was easy to hide along the "route". Again depending on what AC unit you have, you need to get a relay that is switched using 12v that will then switch 120v at the AC unit when the thermostat calls for it. Not rocket science but certainly be aware of the issues. I "hid" my relay (quite small actually) inside the cowling of the AC unit (ie. ceiling "ring" / filter).