Updated September 2026
12V coolers
Thermoelectric vs compressor 12V coolers: which one for a company truck?
Research-based. We did not test these hands-on. Scores come from published specs and driver reviews.
This is the single biggest buying decision in the 12V cooler world, and most drivers get it wrong. The two technologies work nothing alike, cost different money to run, and fail in completely different ways on a company truck.
Photo: ToddMcCann, CC BY 2.0, via Flickr.
Thermoelectric
Cheap and simple — a fan and a Peltier chip, nothing to break. Cools to about 22°C below the surrounding air. Fine for drinks on day trips, but it draws 4–5A continuously with no thermostat, and it cannot hold food-safe 4°C in a hot July cab.
Compressor
A real fridge: dial in any temperature down to about −20°C. Cycles on and off, so overnight draw drops to roughly 1A average — about one-fifth the battery use — and most units shut down before your batteries get too weak to start the truck.
Winner
Thermoelectric: the cheap cooler with a hungry habit
A thermoelectric cooler (think Koolatron P27, a classic Canadian truck-stop fixture) uses a Peltier module — a chip that gets cold on one side and hot on the other. No refrigerant, no compressor, no moving parts except a fan.
That simplicity is the upside. They’re cheap (roughly $195 CAD at the time of writing), light, and dead reliable. There’s almost nothing to break.
The catch is power draw and performance. Published specs for the Koolatron P27 rate it at 4–5 amps (48–60W), and it draws that continuously — there is no thermostat, so it never cycles off. It also doesn’t refrigerate: it cools to about 22°C (40°F) below the surrounding air temperature, per the manufacturer’s own spec. In a 35°C July cab parked for lunch, the cooler interior sits around 13°C — pleasant for drinks, not safe for food.
Compressor: a real fridge that sips power
A compressor 12V fridge (like the Alpicool CF55) works like the fridge in your house: a compressor cycles on, pumps refrigerant, and hits whatever temperature you dial in — including true freezer temperatures down to about −20°C.
While the compressor is running, it draws roughly 45–60W, comparable to the thermoelectric. But it cycles. Owner reports consistently show the average draw lands around 1 amp (roughly 8–15W) once the box is at temperature, because the compressor only runs in short bursts.
That changes the overnight math completely.
The overnight battery math
These are estimates based on published specs and owner reports — your cab, ambient temperature, and how often you open the lid all move them around. There is also a company-policy angle: many company trucks cut power to the 12V outlets when the key comes out. A thermoelectric then just becomes an uninsulated lunchbox overnight — and a warm one by morning. A compressor fridge on a sleeper circuit (or set to a low-voltage cut-off) keeps your food cold until you wake up.
So which one should you buy?
Buy a thermoelectric only if: you’re doing day trips or regional runs where the truck is off at night, your budget is tight (under $200), and you’re storing drinks and snacks rather than food that needs true refrigeration.
Buy a compressor if: you run overnight or multi-day, you keep perishable food in the cab, or you want a freezer option. The purchase price is higher (roughly $400–600 CAD for the Alpicool CF55 class at the time of writing), but you get real refrigeration and you stop worrying about your batteries.
The units behind the math
Alpicool CF55 — the compressor pick
The 55 L compressor fridge used for the numbers above. Full specs and scores on the cooler roundup.
rated 15/20 (provisional · specs + reviews)
Koolatron P27 — the thermoelectric pick
The classic Canadian truck-stop thermoelectric used for the numbers above — the honest budget option for day trips.
Rated 14/20 (provisional · specs + reviews)
Affiliate disclosure: This article contains affiliate links to products on Amazon.ca. As an Amazon Associate I earn from qualifying purchases. Prices change — check the current price on Amazon before you buy.
Want the full shortlist with scores? See our best 12V coolers for truck drivers — compressor and thermoelectric picks side by side. New to 12V gear in the cab? Start with the 12V guide before you buy anything.
Related reading
- Best 12V coolers for truck drivers — the actual units behind this math, ranked and scored.
- Do 12V coolers work at −40°C? — how both cooler types behave in a frozen cab.
- 12V outlet safety — what your cab’s sockets can actually run without blowing a fuse.
- The 12V guide — power setup, outlets, and cab wiring before you buy anything.