Is the Air 4D diesel heater too much for a standard van build?

Published 08/11/2025

Question:

I’m converting a 159” Promaster and thinking about future cold weather trips. Would the Air 4D be overkill?

asked by: Steve

Expert Reply:

Not at all, Steve. A larger van with decent insulation is right in the Air 4D’s # AU96MR wheelhouse. It gives you faster heat-up times and more capacity if you’re heating both the main cabin and a rear “garage” or bunk. You can always run it at lower settings, it’s quieter that way too.

Do you have another heat system you were thinking about? I'm happy to compare options for you. I do think this would suit your needs and work well for you though! Let me know what you think Steve.

expert reply by: Andrew N