Staying cool has a price tag, and in Germany — where summers can swing from mild to brutal — it's worth knowing what you're signing up for before you buy. The good news: the cheapest interventions are often the most effective, and most of your running cost is decided by how you cool, not which device you own. Here's the honest breakdown.
What drives cooling costs?
Two factors decide your cooling bill: the device's power draw and how long it runs. A fan only spins a motor, so it sips electricity. An air cooler adds a small pump and fan — still low power. A mobile air conditioner runs a compressor that actively refrigerates, which is why it draws far more than the other two. Layer on runtime — an AC left on all day in an unsealed, sun-baked room costs far more than the same unit run briefly in a shaded, closed room — and you can see why habits matter as much as hardware.
Fans: the cheapest to run
A fan is the cheapest cooling device to both buy and run, using only a fraction of an air conditioner's electricity. You can leave one going through a hot evening without thinking about the bill. Because it costs so little and is widely available, a fan is almost always the smartest first purchase — even households that own an AC reach for the fan first on milder days. See current options on the fans page.
Air coolers: a low-power middle step
An evaporative air cooler uses modestly more power than a fan — a small pump plus the fan — but far less than an air conditioner. For dry heat, that buys you a few degrees of real temperature drop at low running cost and with no exhaust hose. It's the efficient middle choice when a fan isn't enough but you don't want an AC's power draw.
Mobile air conditioners: most effective, most expensive
A mobile AC is the only portable device that truly refrigerates a room, and that capability costs electricity. Over a long hot summer, an AC's running cost can be many times a fan's. That doesn't make it a bad buy — for a hot bedroom or a top-floor flat it may be the only thing that works — but it does mean efficiency and good habits pay off most here.
How to cut your cooling bill
The biggest savings come from how you run things, not how powerful they are:
- Cool one room, not the whole flat, with the door closed.
- Seal and shade the room so the device isn't fighting the sun or leaking cool air.
- Choose a better energy class if you'll run it often — it costs more upfront but less to run.
- Use timers and sleep modes so nothing cools an empty room.
- Start with the free stuff: outdoor shading and timed night ventilation reduce how much active cooling you need at all.
Does paying more for efficiency pay off?
If you'll run a device frequently, a better energy class earns back its higher price through lower electricity use across the season. If you only cool occasionally, the upfront cost difference matters more than the efficiency gain, and a cheaper unit may be the better value. Match the purchase to how much you'll actually use it.
Compare before you buy
The cheapest way to cool isn't always the cheapest device — it's the right device run well. Compare fans, air coolers, and mobile air conditioners side by side, with current prices and live availability, on the all-products page, and weigh running cost alongside the sticker price before you decide.