Originally Posted by purduepete97
Is there a benefit or requirement to go with an RV specific unit vs a household one?
The benefit is "plug and play."
If you have a Coleman Mach analog, you can buy an Coleman Mach digital and the wiring will a direct replacement. Difference is the Coleman Mach digital will run you about $55, vice about $20 for a Honeywell non-programmable. So for less money, you have to figure out your wiring. If you want to run the fan on both speeds, you'll have to add a SPDT switch to the Honeywell. Also, the Coleman Mach is powered by the TT's 12 VDC system, while the Honeywell has a couple of AA batteries.
Dometic also appears to make a digital version, but I can't speak to prices. Since it apparently uses a switched ground (instead of switched positive), it's a bit odder to install a household one.
Here's a thread that's running now. It talks a bit about the odd Dometic requirements (you use a SPST switch for the fan speed if you go with a household T-stat.)
Need help with Honeywell programmable thermostat
If you aren't particularly electrical-minded, it's probably better to go with the digital version of whatever you have.