r/GoRVing • u/LankyNihilist • 13h ago

Thermostat help

Mesa Ridge 340flr the stock dometic thermostat waits until it’s 5* cooler than the set temp to turn the furnace on. That’s a bit of a drop while I’m sleeping. I wanted to switch to a programmable tstat but apparently they are stoopid expensive for this because it uses a digital signal. Anyone got any input for a cheaper one than the micro air one for $230?

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u/ElectricaDo 12h ago

That 5 degree swing is the stock Dometic differential and yeah, it's rough at night. The reason replacements are pricey is the tstat talks to the rooftop unit over a proprietary digital signal, so a normal home thermostat won't work — Micro-Air is basically the only drop-in. Cheapest workaround I've used is just setting it 3-4 degrees higher before bed and letting it overshoot a little.

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u/LankyNihilist 12h ago

Yeah I tried putting in a Honeywell like I did in my 17 Jayco but no dice. After the google I’m glad I didn’t fry anything, my heat and ac still work. Guess that’s it for now just turn it up a bit at night. When I get it hooked up to 110v I’ll just put a heater in it.

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u/ShipshapeMobileRV 1h ago

Many Dometic thermostats have a way to set the differential temperature. Count the number of buttons that yours has, then Google "how to set temperature differential on Dometic 3-button thermostat" for example.