15,000 BTU Dometic RV Air Conditioner

What size RV does a 15,000 BTU Dometic air conditioner cool?

A 15,000 BTU Dometic unit is sized for most full-size travel trailers, fifth wheels, and Class A or Class C motorhomes up to roughly 32 to 40 feet, depending on insulation and climate. In hot Southern climates or rigs with poor insulation, a 15K BTU rooftop is the practical minimum for a single-zone install. For larger rigs, owners typically run two units. Confirm your existing roof opening (standard 14 inch by 14 inch) and shore power capacity (30 amp or 50 amp) before ordering.

Do these units come in ducted and non-ducted configurations?

Yes. This collection covers both Dometic 15,000 BTU ducted models (for rigs with ceiling ductwork distributing air through multiple vents) and non-ducted models (single discharge through the ceiling assembly). The rooftop unit is the same, the difference is the indoor ceiling assembly. If you need parts to complete a non-ducted install, see the Dometic ceiling assembly for non-ducted installations with wall thermostat or the FreshJet 5 heat pump ceiling assembly.

Will a 15,000 BTU Dometic AC fit my existing 13,500 BTU roof opening?

In most cases, yes. Dometic 15,000 BTU rooftop units use the same standard 14 inch by 14 inch roof opening as their 13,500 BTU counterparts, so a direct swap is common. The two things to verify before ordering are shore power capacity (a 15K unit draws more amps on startup, a soft start kit is recommended on 30 amp service) and that your existing ceiling assembly is compatible with the new rooftop. Check the model number on your current ceiling assembly against the new unit's spec sheet.

What is the amp draw on a 15,000 BTU Dometic rooftop AC?

Running current on a 15,000 BTU Dometic rooftop is roughly 13 to 16 amps at 115V AC, with startup (locked rotor) draw spiking considerably higher. On 30 amp shore power, this leaves limited headroom for other appliances, and the inrush can trip pedestal breakers in older parks. A soft start kit reduces inrush by up to 75% and is the standard fix. For shoppers expanding electrical capacity at the same time, related parts are listed under RV plug adapters and RV electronics.

How does shipping work on rooftop AC units?

Rooftop air conditioners ship via truck freight due to size and weight, with a freight charge calculated at checkout. Smaller replacement parts and ceiling assemblies ship via standard ground carriers, free on orders over $100. If you need help confirming fitment before placing a freight order, text or call our team at 817-984-1852.

What is the difference between a heat pump and a cool-only 15,000 BTU unit?

A cool-only Dometic 15K unit provides air conditioning only. A heat pump version adds reverse-cycle heating, useful in shoulder seasons (roughly 40 to 60 degrees F outside) when you want warmth without running the propane furnace. Heat pumps lose efficiency below about 40 degrees F and are not a furnace replacement in winter conditions. Both versions use the same roof opening and similar amp draw during cooling operation.