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Tiffin Motorhomes Knowledge Base

Can I run my roof A/C's while driving?

Yes, you can run your roof A/Cs while driving in a Tiffin motorhome—but it depends on your setup:

✅ You Can Run Roof A/C While Driving If: 

  • You have a generator running – This is the most common setup in Tiffin Class A coaches.  The generator provides 120V AC power to your air conditioners. It's designed for this and perfectly safe for long drives.

Bonus: it keeps the coach cool for passengers, pets, and your fridge.

  •    Your coach has an inverter large enough (typically not the case for A/C loads unless you've got a serious lithium + solar + hybrid inverter setup).

⚠️ Things to Watch For:

  • Fuel consumption: Generator pulls from the same fuel tank as your engine.
  • If fuel drops below ~1/4 tank, the generator will shut off to keep you from being stranded.
  • Load management: Avoid running everything (e.g., both A/Cs, microwave, etc.) at once unless you know your generator can handle it—most Tiffin coaches have a load-shedding system to help.

👎 You Can’t Run Roof A/C on Batteries Alone:

  • Air conditioners draw too much power for standard battery/inverter setups.
  • Even lithium batteries would drain very fast without generator or shore power.
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