Cold that goes where you go

There are two ways to make a box cold. The easy way is a thermoelectric plate: cheap to build, light to carry, and honest only in mild weather, because all it can promise is a fixed step below whatever the air around it happens to be.

The harder way is a compressor, the same machine that lives in a kitchen refrigerator, shrunk until it fits under a car seat. It costs more, weighs more and takes real engineering to run off a 12-volt socket without flattening the battery. We chose the harder way for every refrigerator we make, and here is what that choice means in practice.

Start with the number that matters in a hot car. A thermoelectric cooler rated "40 degrees below ambient" sounds generous until the cabin reaches a summer afternoon, at which point the maths stops working in your favour. A compressor does not negotiate with the cabin. Set one of our car boxes to -4°F and it holds -4°F, on the road, at the camp, in July. 8 of our 14 car refrigerators go further and split into two zones, fridge one side and freezer the other, each holding its own setting.

The same engineering shows up in the details that never make a headline. Every 12-volt box carries battery protection with selectable cut-off levels, because the fridge is a guest in the vehicle's electrical system and a guest does not drain the house. Lids are cut so they open in the length of a boot without shovelling gear aside first. Handles are sized for the box loaded, not the box in the brochure.

Indoors, the same habit wears a glass door. A beverage centre is not a small kitchen fridge; it is a machine tuned for one job, holding drinks at serving temperature on shelves designed around cans and bottles rather than around casserole dishes. Ours run from a 24-can cube for a desk to a 180-can centre for a den, with wine cabinets holding 12 to 45 bottles at their own, warmer setting, because wine and lager do not want the same night.

The newest line moves air instead of chilling boxes. Our portable air conditioners run from 8,000 to 14,000 BTU, rated for real rooms up to 750 square feet, and most are three machines in one cabinet: air conditioner, dehumidifier and fan. The rating that matters is printed in square feet as well as BTU, because a BTU figure without a room size is a horsepower number without a car attached.

Across all 4 lines, one rule holds the range together: the figure printed beside a product is the figure that product states, in the unit a buyer actually shops with. Quarts for the car. Cans and bottles for the den. BTU and square feet for the room.