Cool Box vs Fridge: Which Should You Fit in Your Campervan?

Should you fit a built-in fridge or use a portable cool box in your campervan or caravan? It is one of the most debated questions in the touring world, and the answer depends on how you use your vehicle, how long your trips are, and how much flexibility you want. This guide compares the two approaches honestly.

How They Work

A built-in fridge is permanently installed in your vehicle, usually powered by 12V while driving and 230V on hook-up. Absorption fridges can also run on gas. They sit in a fixed cabinet and form part of the kitchen layout.

A portable cool box sits wherever you put it — in the vehicle, in an awning, or carried to a picnic spot. Compressor cool boxes use the same refrigeration technology as domestic fridges, reaching genuine fridge and freezer temperatures. Thermoelectric models use a simpler system that cools to a set number of degrees below ambient.

Cooling Performance

Compressor cool boxes and built-in compressor fridges deliver similar cooling performance — both maintain precise temperatures regardless of outside conditions. The technology inside is essentially the same.

Absorption fridges, which are common in older caravans and many motorhomes, work differently. They rely on gravity and heat to circulate the refrigerant, which means they must be relatively level to work properly. Performance drops noticeably in very hot weather and when the vehicle is not level. Compressor cool boxes have no such limitation — they work at any angle and in any temperature.

Thermoelectric cool boxes are the weakest performers. They typically cool 15 to 20 degrees below ambient, which means in a 35-degree heatwave your food sits at 15 to 20 degrees — not ideal. For serious food safety, compressor is the way to go.

Flexibility and Portability

This is where cool boxes win decisively. A portable compressor cool box can move between vehicles, sit in an awning, go on a boat trip or serve as a second fridge at home. A built-in fridge stays where it is installed.

For owners who use multiple vehicles, attend festivals, or want cooling that is not tied to one location, a portable cool box offers dramatically more flexibility. The Mestic MCCP-45 at 45 litres is a popular choice — large enough for a couple on a week-long trip, portable enough to move between car and caravan.

Space and Installation

A built-in fridge requires a dedicated cabinet space, ventilation behind the unit, and permanent wiring. In a motorhome or caravan with a factory-fitted kitchen, this is already done. In a campervan self-build, it means committing a significant chunk of your layout to a fixed appliance.

A cool box needs no installation. Place it on the floor, a shelf or a dedicated stand, plug it into your 12V socket or connect directly to your leisure battery, and it is working. When you do not need it, store it elsewhere. For self-builders, this simplicity is a major advantage.

Power Consumption

Modern compressor cool boxes are remarkably efficient. The compressor cycles on and off as needed, so average power draw is significantly lower than the rated wattage. A typical 35 to 50 litre compressor cool box draws 40 to 60Wh on average — easily sustained by a 100Ah leisure battery with solar top-up.

Built-in compressor fridges draw similar power. Absorption fridges on 12V draw more power for less cooling performance, which is why many owners run them on gas when off hook-up.

Dual-Zone Options

One advantage cool boxes have over most built-in fridges is dual-zone capability. Models like the Mestic MCCP-75 run one compartment as a fridge and the other as a freezer simultaneously. Achieving this with a built-in setup requires two separate appliances.

Which Is Right for You?

Choose a built-in fridge if your vehicle already has one fitted, if you never need cooling outside the vehicle, or if you want a seamless kitchen layout. Choose a portable compressor cool box if you value flexibility, use multiple vehicles, want easy installation with no permanent modification, or need dual-zone cooling in a single unit.

For many touring owners, the answer is a compressor cool box. It delivers the same cooling performance as a built-in fridge with none of the installation constraints. Browse the full Mestic cool box range to find the right size and features for your setup.