What size mini-split for a 30 ft RV?
A 30 ft RV often has 200–250 sq ft of cooled living space. At RV insulation factors, expect 7,000–9,000 BTU calculated — buy a 9,000 BTU unit minimum; 12,000 BTU is common for full-timing in hot climates.
What Size Mini-Split for an RV?
RVs and campers lose heat through thin walls, single-pane windows, and constant air leakage. We apply higher BTU-per-sq-ft factors and default to poor insulation — realistic for skoolies, fifth-wheels, and travel trailers.
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Sizing settings
Typical RV BTU ranges
A 30 ft RV with 200–250 sq ft of cooled living space often needs 7,000–9,000 BTU calculated — buy 9,000 BTU minimum; 12,000 BTU is common for full-timing in hot, humid climates.
Read what size mini-split for an RV and RV installation options before cutting holes in the shell.
Power planning — 30A vs 50A and soft start
9k–12k BTU units typically need 15–20A at 110V or 220V depending on model. Full-timing requires 30A shore power or adequate inverter/generator capacity — electrical planning is as important as BTU sizing.
Soft-start kits lower compressor inrush so a 30A pedestal or generator can start a 12k unit that would otherwise trip. Confirm amp draw on the nameplate and whether your kit is 120V or 240V before you buy.
Boondocking on solar/inverter? Size continuous inverter watts above running load and surge above locked-rotor amps — or stick with a roof AC that matches your existing converter wiring.
Roof AC vs ductless
Roof units are easier to install but noisier and less efficient at dehumidifying. Mini-splits are quieter and perform better in humid climates but need custom condenser mounting and line-set routing.
Condenser placement must stay clear of road spray, propane tanks, and slide-outs. Frame mounts and vibration isolation matter as much as BTU — poorly mounted outdoor units fail early on travel days.
Climate upsizing for full-timers
Desert and Gulf Coast full-timers often upsizing one retail step above calculated cooling load for peak afternoon heat. Do not double capacity — humidity control still needs run time.
Winter camping below freezing needs a cold-climate heat pump rating or supplemental heat. See heat pump vs air conditioner and the heat pump cold climate calculator for heating-side planning.
Related guides
Frequently asked questions
Can I install a mini-split on an RV?
Yes — many skoolie and RV DIYers mount the condenser on a hitch rack or roof bracket and run lines to an interior head. You need 30A+ shore power or adequate inverter/generator capacity.
RV roof AC vs mini-split — which is better?
Roof units are easier to install but noisier and less efficient. Mini-splits are quieter and dehumidify better but need custom mounting and 110V/220V planning.
What size mini-split for a 25 ft travel trailer?
A 25 ft trailer often has 160–200 sq ft of cooled space. At RV insulation factors that is about 6,000–8,000 BTU calculated — a 9,000 BTU head is the practical buy; go 12,000 BTU if you boondock in the Southwest.
Related calculators
HVAC Calculators · https://hvaccalculators.net/mini-split-for-rv/