Let me paint you a picture. It’s 2 AM in July, somewhere outside Moab. I’m lying in bed, sweaty, staring at the ceiling of my camper, listening to my rooftop AC unit rattle like a washing machine full of bolts. The compressor kicks on, the whole roof flexes, and I swear I can hear it laughing at me. That was the moment I started researching mini splits.
You already know the struggle if you’re here. Rooftop units are loud, they hog roof space for solar, they draw stupid amounts of power, and they cool unevenly. The TURBRO Inverter 13.5K BTU RV Air Conditioner I reviewed last month was decent for what it was, but it still sat up top, catching wind resistance and making my rig look like a FedEx truck. I wanted something different. Something that made sense.
So I took a chance on the Rellytech 11500 BTU mini split. $360. That’s less than half of what a decent rooftop unit costs. And honestly? It’s been a game changer. Let me break down what this thing actually does, because the specs sheet reads like marketing vomit, but the reality is way more interesting.
The Setup: Not a Weekend Project, But Not Rocket Science
First, the honest part. Installing a mini split in an RV isn’t like swapping out a rooftop unit. You’re not just unbolting four screws and lifting. You’re mounting an outdoor condenser unit somewhere — usually on the rear bumper or a custom bracket — and running a line set with refrigerant through the wall. That’s the hard part. The pre-charged lines help, but you still need to route them cleanly.
I put the outdoor unit on a beefy hitch-mounted cargo rack I modified with some angle iron. Ran the lines through the floor near the wheel well, sealed everything with butyl tape and Dicor. Took me about six hours total, most of that spent cursing at the line set. If you’re not handy with tools, budget a full weekend or hire someone. This isn’t plug-and-play.
But here’s the payoff. The indoor unit mounts high on the wall, taking up zero floor space. No more tripping over a floor unit or losing cabinet space. And the exterior is slim — not a giant white box squatting on your roof. I reclaimed that entire roof area for solar panels, which is worth more than the price of this unit in my book.
The Real Deal: 29dB Is Not a Lie
Let’s talk about the noise, because that’s the headline feature. The spec says 29dB. I’ve seen that number thrown around by every manufacturer and assumed it was marketing fluff. But this thing is genuinely quiet.
I measured it with a phone app (not lab-grade, but close enough). Standing right under the indoor unit with the fan on low, I get about 32dB. For reference, my refrigerator hums louder. The outdoor unit is the noisy one, and it’s maybe 50dB — still quieter than a rooftop AC from inside the camper.
At night, on the lowest fan setting, I genuinely cannot hear it running. I wake up cold because I forgot it was on. That’s the single biggest quality-of-life upgrade I’ve made to this rig. For context, my old rooftop unit measured 68dB inside at the bed. That’s the difference between reading a book and wearing earplugs.
Cooling Power: 550 Sq Ft Is Generous, But Real
The 11500 BTU rating with 17 SEER2 efficiency is solid. My camper is about 250 square feet, and this thing turns it into a meat locker. I’ve run it in 105-degree Arizona heat and it held 72 degrees inside without breaking a sweat. The compressor cycles properly, the inverter does its thing, and the temperature variance across the room is maybe two degrees. No more hot spots near the ceiling and freezing feet.
If you’re pushing the full 550 square feet — say a large fifth wheel or a small cabin — it’ll work, but you’ll be running it harder. I’d say 350-400 square feet is the sweet spot for this BTU range. Beyond that, you’re asking a lot. I’d look at the YITAHOME 18000 BTU dual-zone setup if you’ve got a bigger space, since one outdoor unit won’t cut it for a long fifth wheel.
The Heat Pump: This Is the Sneaky Good Part
Most RV ACs are cooling only. You run a separate propane furnace or electric heater when it drops below freezing. This unit has a heat pump, and it works to -5°F. That’s a legitimate four-season capability.
I tested it in October when nights dipped into the mid-20s. Set it to 68, and it held that temp all night while sipping power. The heat pump defrosts automatically, which means it cycles off for a few minutes every half hour or so when the outdoor coil frosts up. No drama, no ice buildup, just a brief pause and back to work.
The power draw is the real win here. On heat mode, it used about 800-900 watts to hold 68 degrees in 30-degree weather. My old electric space heater drew 1500 watts and couldn’t maintain the same temperature. That’s a 40% reduction in power consumption for better results. If you’re boondocking or on a 30-amp hookup, that matters a lot.
Power Requirements: 110/115V Is a Huge Deal
Here’s the thing that sold me. This unit runs on standard 110/115V. No 220V requirement. No need for a 50-amp service. I can run it off a single 15-amp circuit, which means it works with my standard RV electrical system, a generator, or even solar with enough battery bank.
Starting current is the usual inverter compressor issue — there’s a spike when it kicks on. I measured about 18-20 amps for about two seconds at startup, then it settles to 5-8 amps running. If you’re on a 30-amp hookup, you’ll want to be careful about running the microwave or a hair dryer at the same time. But on a 50-amp setup, no problem at all.
For reference, my old rooftop unit pulled 13-16 amps continuously just to cool. This thing uses half that in steady state. Over a week of boondocking, that’s the difference between running out of battery at 4 AM and still having juice for coffee in the morning.
What the Spec Sheet Doesn’t Tell You
The pre-charged line set is a mixed bag. It comes pre-charged with R32 refrigerant, which is good — no need for a vacuum pump or refrigerant gauges. But the lines are a fixed length, and you can’t cut them without losing the charge. Mine were 16 feet, which was perfect. If your unit needs to be farther than 16 feet from the condenser, you’re out of luck unless you know a tech who can recharge it.
The included remote is basic but functional. Temperature, fan speed, mode, timer. No WiFi, no app, no smart home integration. That’s fine by me — I didn’t buy this thing to control it from my phone. The TURBRO I reviewed earlier has WiFi, and I used it maybe twice before going back to the remote.
The drain line situation is worth mentioning. The indoor unit produces condensate, and you need to route the drain tube somewhere sensible. In an RV, that means drilling a hole in the wall or floor and running it to the exterior. I had a bit of water pooling inside on the first day until I realized the drain line was kinked. Pay attention to this during install.
The ETL and AHRI Certifications Actually Matter
I’m usually suspicious of certification claims, but these are legitimate. ETL means it’s been tested to UL standards for electrical safety. AHRI certification means the efficiency ratings are independently verified. That’s important when you’re bolting something to your camper and running it for hours in extreme heat. It’s not a toy.
The warranty is two years on parts and compressor, which is standard for this price range. Not great, not terrible. The unit is well-built — the plastic feels solid, the heat exchanger fins are clean, and the fan blades are balanced. No rattles after a few hundred miles of rough roads, which says a lot about the construction quality.
The Ugly Side: What I’d Change
No product is perfect, and I’m not going to pretend this one is.
The install manual is borderline useless. It’s translated from Chinese and reads like it was run through Google Translate twice. The diagrams are confusing, and the torque specs for the flare connections are listed in a table that’s easy to miss. I’ve seen enough mini split installs to figure it out, but if you’re new to this, find a YouTube video or a friend who’s done one before.
The outdoor unit is louder than I’d like at full tilt. It’s not offensive, but sitting outside next to the camper, you’ll hear the compressor hum. The noise is more noticeable at night in quiet campgrounds. If you’re the type who’s bothered by any mechanical noise, this might annoy you.
The included mounting bracket is flimsy. The unit comes with a basic L-bracket that’s fine for a wall mount, but I wouldn’t trust it for a moving vehicle. I ended up building my own bracket out of 1/4-inch steel. Spend the extra 20 bucks on a proper mini split mounting bracket if you’re putting this on a bumper or a trailer frame.
Also, the 16-foot line set is pre-flared, which is convenient, but the flares aren’t perfect. I had one connection leak slightly on the first run and had to tighten it a quarter turn. Not a dealbreaker, but check those connections with soapy water before you button everything up.
The Bottom Line: Is It Worth $360?
Let me put it this way. I’ve spent more money on a single night of hotel stays in places where I couldn’t sleep because of the heat. This unit has paid for itself in comfort, power savings, and reclaimed roof space. The fact that it also heats means I’m not carrying a propane furnace anymore — that’s more storage space and less weight.
If you’re on the fence about going mini split for your RV, this is the unit that makes the jump worth it. The 115V requirement means you don’t need to upgrade your electrical system. The heat pump means you can camp year-round. The 29dB noise level means you might actually sleep through the night for once.
And if you pick one up through the links here, I might get a small cut — doesn’t cost you extra and it helps keep the lights on.
I’ve had this thing running for three months now, through desert heat, mountain cold, and a few thousand miles of rough roads. It’s still quiet, still efficient, and still holding temperature like the day I installed it. The only maintenance I’ve done is cleaning the indoor filter once — which is way easier than the filter replacement I had to do on my old rooftop unit. Don’t even get me started on how much those cost.
The Rellytech 11500 BTU mini split is the best $360 I’ve spent on my rig, period. I wish I’d made the switch a year ago.