Cool Boxes Buying Guide

The ideal portable cooler varies from person to person. This guide sets out important considerations to have in mind, allowing you to make an informed decision based on your individual needs and preferences.

Cooling technologies – what’s available?
Cooling and freezing in hot climates
What size should your cooler be?
Which energy sources do you want to use?
Avoid a flat vehicle battery
Are you concerned about noise from your cooler?
Will you travel for long or short periods of time?
Coolers for use away from the vehicle
Is it possible to cool “passively” without the need for power?
Do you want to pre-select a target temperature?
Cold drinks for the driver
Easy to clean features
Refrigerate and freeze simultaneously
Is there a cooler that can heat too?

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Cooling technologies – what’s available?

There are three types of cooling technology: absorption, compressor and thermoelectric cooling. Each technology has its own particular advantages that recommend them for certain conditions. The key features of each are:

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Types of Cooling technologies

Absorption

Gas-powered cooling allows you to travel off-grid
Silent operation
Cooling performance depends on the ambient temperature
Convenient three-way power options: 12 V DC, 230 V AC and gas operation

View absorption portable coolers >

Thermoelectric

Low purchase cost
Lightweight
Performs well in inclined position
Typically heavily dependent on ambient temperature, but the unrivalled cooling power of certain Dometic thermoelectric models break the mould!
12/24 V DC, 230 V AC operation possible

View thermoelectric portable coolers >

Compressor

Excellent cooling even in extreme ambient temperatures
Powerful cooling enables refrigeration and deep-freezing
Low power consumption
Performs well in inclined position
Suitable for solar operation
Integrated battery protection
12/24 V DC, 110 – 230 V AC operation possible

View compressor portable coolers >

Cooling and freezing in hot climates

It is important to consider the type of climate you’ll be in, while using your portable cooler.

Thermoelectric and absorption coolers will cool between 18–30 °C below the ambient temperature. Clearly, this may not be adequate if you are travelling in a region where temperatures reach 30 °C or more.

And so in hot regions, we recommend using a compressor cooler. As shown in the table below, the cooling performance is so powerful that it can deep-freeze in even the hottest ambient temperatures:

Cooling technology	Outside temperature	Internal temperature achieved
Thermoelectric	40 °C	22 °C to 10 °C (depending on model)
Absorption	40 °C	20 °C to 10 °C (depending on model)
Compressor	40 °C	Preset temperature within range: 10 °C down to –22 °C (depending on model)

What size should your cooler be?

Firstly, consider the amount of storage space available in your vehicle. Next, the number of people who will be dependent on the cooler. Also consider, how long you intend to enjoy complete independence from the shops – perhaps you intend to travel to remote areas? Finally, larger coolers require more energy to run – is the added drain on resources worthwhile? We provide sizes to suit all circumstances.

The range of capacities according to cooling technology are:

Absorption: 31 l – 40 l
Thermoelectric: 8 l – 37 l
Compressor: 10.5 l – 88 l

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Which energy sources do you want to use?

The standard energy sources for Dometic portable coolers are:

Energy source
Absorption technology	12 V / 230 V / Gas
Thermoelectric technology	12 V / 24 V / 230 V
Compressor technology	12 V / 24 V / 110 V – 230 V

Absorption coolers stand out for their convenience as they run on AC, DC and, when used outside the vehicle, gas power too! Whereas, compressor coolers are ideal for solar power due to their low energy consumption. Solar is a cheap and clean option.

View flexibly powered absorption coolers >
View compressor coolers suitable for solar power >

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Avoid a flat vehicle battery

The integrated battery protection of our compressor coolers prevents a flat battery. Once the power level of your vehicle is drained to a pre-set “disconnect level”, it will immediately cut power to your refrigerator. Your drinks may, in time, become a little warmer, but at least you’ll be driving home!

Since absorption coolers run on gas, as well as electricity, they offer a clear solution to protecting your vehicle’s battery power. Thermoelectric units can benefit from a low voltage monitor on some models or available as an optional accessory, which protects the battery by automatically cutting off power at low voltage.

Efficiency is also important. Any cooler that runs on mains electricity must, by law, be rated for its efficiency. We set a new efficiency benchmark for compressor coolers – our CFX range is the first cooler to achieve an A++ rating. Our thermoelectric coolers also consistently achieve up to A+++ rating. Absorption coolers are not obligated to the energy labelling because they are mainly used on gas.

View compressor coolers with battery protection >
View high efficiency thermoelectric coolers >
View high efficiency absorption coolers >
View low voltage monitor >

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Are you concerned about noise from your cooler?

Depending on where your fridge will be placed and how sensitive you are to noise, the operating noise of a fridge may be important. Noise levels depend on the cooling technology used in the cooler:

Absorption – absolutely silent
Compressor – occasional, quiet running
Thermoelectric – continuous fan noise

View silent absorption portable coolers >

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Will you travel for long or short periods of time?

While travelling for long periods, you’ll appreciate having a deep-freeze function that extends the life of your food. A compressor cooler can freeze down to –22 °C.

For shorter trips of a few days or a week, an absorption cooler will be perfectly suitable. In certain models, you can even store ice cubes inside the refrigerator’s evaporator component. Although not as powerful as compressor units, absorption fridges will cool contents.

A thermoelectric refrigerator keeps items cool, rather than cools them itself. This makes it necessary to pre-cool items before setting off on your trip. It also makes it a less suitable option if you intend to rely on it for more than a day or two.

View compressor portable coolers >
View absorption portable coolers >
View thermoelectric portable coolers >

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Coolers for use away from the vehicle

Several models of Dometic cooler are suitable for taking to the beach or for use at picnics away from the vehicle. For this type of usage, we recommend a lightweight model of cooler which should, ideally, also feature a carry strap and/or sturdy handles for convenient transport.

To maintain cooling performance, wherever you are, an absorption cooler’s ability to run on gas is a significant advantage. All types of portable cooler could rely on a battery for power away from the vehicle. Alternatively, you could adopt the traditional and cheap solution of reusable ice packs.

Finally, there are the non-powered, passive coolers which are specifically designed for cooling “off-grid” (see next).

View coolers with carry handles or straps >
View absorption cooler with gas cartridge >
View batteries >

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Is it possible to cool “passively” without the need for power?

Our “roto-molded” non-powered cooling boxes boast superior insulation and durability thanks to their thick construction. This allows ice to be kept for 3–7 days depending on usage and ambient temperatures! Impressive stuff. View non-powered cooling boxes >

Do you want to pre-select a target temperature?

Only compressor coolers allow an exact, pre-set temperature to be achieved. Some models of thermoelectric and absorption coolers allow you to vary the level of cooling power used, but a specific, target temperature cannot be chosen. View compressor coolers with pre-set temperature control >

Cold drinks for the driver

Long drives can be thirsty work and, on such occasions, you’ll appreciate having a portable cooler within easy reach of the driver’s seat! Some models of portable cooler fit neatly between the front seats while others can be firmly strapped into a passenger seat using the seatbelt. View ideal coolers for use while driving >

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Easy to clean features

If hygiene is a priority for you and your family, then a cooler that is convenient to clean is a big plus. Look out for features such as a plug to drain away melted ice and removable parts such as baskets or dividers. View portable coolers designed for easy cleaning >

Refrigerate and freeze simultaneously

Certain models of compressor cooler have two independent cooling zones. This means that one zone can be used to refrigerate and, at the same time, the second zone for freezing. A highly convenient feature that saves you having to buy (and store) two cooling units. View compressor coolers with two cooling zones >

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Is there a cooler that can heat too?

Some of our coolers can keep their contents warm, as well as cool. Although not designed for heating food from chilled, by placing a hot pie in a unit that heats up to 65 °C, it can be enjoyed warm later that day! View portable coolers with heating function >