How We Chose Our First Test Categories

Every review site has to pick its first battle. Ours are 12V air conditioning, compressor fridges, diesel heaters, and roof vent fans, in that order. Here is the actual reasoning, because “trust our priorities” is not something we get to ask for yet.

The test for a first test

We scored candidate categories against four questions:

1. Can we test it properly, today? Real units, standardized conditions, no guesswork.
2. Is the internet’s current answer bad? If existing reviews already settle the question with real measurements, we add nothing by piling on.
3. Does the purchase actually hurt if you get it wrong? Wasted money, sleepless nights, or a battery bank drained by morning.
4. Is there a number people argue about that an instrument can settle?

Air conditioning, fridges, heaters, and fans swept all four. The big glamour category, power systems, deliberately did not go first. More on that below.

Air conditioning: a brand-new category with almost no real numbers in it

Twelve-volt air conditioning is the newest, fastest-moving corner of van building. Pre-charged 12V mini splits, units a DIY builder can install without an HVAC technician, barely existed in the US market until recently. The claims on these units are bold, the price gap between budget and premium is enormous, and the arguments about what they really draw and whether a battery bank can run one overnight are running on almost no measured data.

We are in an unusual position to fix that: one of the first pre-charged 12V mini splits sold in the US is installed in our van. Not a loaner on a bench for a week. Bought, installed, and running through a real summer. Amp draw under load, actual cooling performance, condensation behavior, noise, and everything the install process got wrong and right, with photos. That is the launch flagship, and it is why this category jumped the queue: it is July, the arguments are happening right now, and we own the evidence.

Fridges: one logger versus a decade of forum anecdotes

Ask what a 12V fridge really draws overnight and you will find answers spread across an order of magnitude, measured on different fridges, in different climates, with different meters, or not measured at all. It is the single most consequential number in the category, because it decides how much battery you buy, and battery is where builds get expensive.

A watt-hour logger, a controlled ambient temperature, and identical test loads settle it. The question is important, the existing answers are anecdotes, and the instrument is cheap.

Heaters: the scariest purchase gets tested before the cold arrives

Budget diesel heaters are the most tempting gamble in van building: the price gap between the cheap units and the name brands is enormous, and so is the anxiety about what you give up. The failure stories are everywhere, the safety questions are real, and the search results for this category are some of the worst we have seen anywhere: pages that have plainly never mounted, fueled, or run the thing.

Heaters are queued for early fall so results are published before the buying season, when people actually need them. Combustion testing starts outdoors with CO monitoring, per the process on How We Test, because “we tested it” should never mean “we got lucky.”

Fans: a small category where measurement wins instantly

The roof fan market is effectively a handful of models, and every van gets one. The defining comparison between the big two has been argued for years mostly on loyalty and anecdote. Airflow, current draw, and noise at every speed are all measurable in an afternoon with the right instruments.

Why not start with power systems?

Power is the biggest line item in most builds and the category people are most afraid to get wrong. It is also where we refuse to rush.

Electrical advice carries real safety weight, the products are expensive enough that thorough multi-unit testing takes real capital, and frankly, the bar for doing it credibly is higher. We would rather earn our stripes on categories where we can be excellent immediately, then bring the same discipline to batteries, chargers, and power stations with the lab already proven. Power content is coming. It goes live when the bench, the budget, and the safety review are ready, and not a week before.

What you can hold us to

The first air conditioning data publishes from the unit in our own van, and the first fridge data when the logging is done. If a category above ships without the measurements described here, that is a broken promise, and the methodology page exists so you can call it.