Renting an air conditioner in Berlin: prices, providers, and what actually works for tenants
Nearly every AC rental firm in Berlin serves businesses only. Here are the real numbers for private households, plus what a tenant may legally set up.
You can rent an air conditioner in Berlin as a private tenant, and the honest full-season price is €545 with a quiet portable unit or €1,095 with a mobile split unit, via KlimaLegal's Sommer-Abo (Summer Rental), with delivery, setup and end-of-season collection included. Nearly every other AC rental firm in the city, including Climate Energy, Deutsche Thermo, Atowik and KTG, serves business customers: trade fairs, offices, server rooms, prices on request.
If you have spent an evening searching and found nothing but request-a-quote forms, that is the market talking, not your search skills. Berlin's AC rental business was built for companies. So here is what actually exists for a private household, and what you may set up in a rented flat without asking anyone.
Why most rental offers are not meant for you
The firms that dominate the search results earn their money on commercial jobs. Climate Energy and Deutsche Thermo cool exhibition halls, office floors and production spaces. Atowik rents out event and climate technology, and KTG handles industrial cooling such as server rooms. The routine is always the same: you fill in a contact form, a sales team calls back, and the quote arrives as a weekly or monthly rate.
That model exists for short, planned jobs. A trade-fair stand needs three days of cooling. An office bridges a few weeks until its fixed system is repaired. Weekly rates make sense there. Stretch the same rates across a whole summer in a two-room flat and they usually cost more than buying a unit outright. And the household part is simply missing: nobody fits a seal onto your tilting Altbau window, and hauling a unit up to a fifth-floor walk-up in Prenzlauer Berg is not in the contract. These companies are not doing anything wrong. You are just not who the price list was written for.
What does renting actually cost?
Published household prices are rare in this market, so here is the whole picture side by side. The Abo figures below are the fixed 2027 season prices. No asterisks, no 'from' pricing.
| Option | Cost | Best for |
|---|---|---|
| Commercial rental (events, offices) | Weekly or monthly rates on request, delivery usually billed separately | Companies, trade fairs, server rooms |
| Buying a portable unit (partner link) + setup service | Device price varies by model, roughly 300 to €700, setup €149 one-off | Anyone keeping the unit long term |
| Sommer-Abo Standard | €89 per month, 4-month minimum term, plus €189 one-off, €545 total for the season | Living rooms, home offices |
| Sommer-Abo Premium "Leise" | €199 per month, 4-month minimum term, plus €299 one-off, €1,095 total for the season | Bedrooms |
Whichever route you pick, electricity comes on top. A rough benchmark: a portable unit drawing 1,000 watts and running six hours on a hot day costs about €2.40 at 40 cents per kilowatt hour. Across a Berlin summer that lands somewhere between 70 and €150, depending on how many genuinely hot days the city gets.
Rent or buy: a quick sanity check
Buying wins if you will use the unit for several summers and have somewhere to store 30 kilograms of plastic from October to May. Decent portable units start at roughly €300. KlimaLegal, for the record, never sells devices. The site links to partner retailers, and the retailer is the seller and carries the warranty. If you buy but would rather not wrestle with exhaust hoses and window seals, the setup service installs your own device for a one-off €149.
Renting wins if storage is the problem. Or carrying is. Or you simply do not want to own a bulky appliance you use four months a year. With the Abo, the unit arrives in June and gets collected again from mid-September. And if after two summers you decide it should stay, the Standard plan offers a rent-to-own takeover, the Mietkauf.
What are you allowed to install as a tenant?
Anything that leaves the building untouched usually needs no landlord permission: portable monoblocks, window units, and mobile split units whose refrigerant circuit is factory-sealed and never opened, the PortaSplit class. You place the unit, route the exhaust hose or hang the bracket in an open window, and that is it. One catch: if part of the unit sits visibly outside the window, like the outdoor half of a mobile split, your landlord can set limits on that.
Fixed split systems are a different story. They need a hole drilled through the wall and an outdoor unit bolted to the facade, so your landlord has to agree in advance. On top of that, the EU F-Gas Regulation requires installation by a certified firm. KlimaLegal does not offer fixed splits and does not advise on them.
How the Sommer-Abo works
The season runs from 1 June to 30 September. Before it starts, the unit is delivered and set up. Standard means a quiet monoblock sized to your room, with the window seal properly fitted. Premium means a mobile split whose compressor hangs outside on a window bracket, which is what makes it quiet enough for a bedroom. Premium installation is always done by two KlimaLegal technicians, never by the customer.
- No deposit, at any point
- A replacement unit within 3 working days if yours breaks
- Collection from mid-September, appointment agreed in August
- 30 Sommer-Abo slots for the 2027 season
KlimaLegal runs a dedicated Berlin page with the local details, Altbau window quirks included, at klimalegal.de/ac-services/berlin. If you want one of the 30 slots for summer 2027, the waitlist is open now. Thirty slots in a city of almost four million people is not many.
FAQ
- How much does it cost to rent an air conditioner in Berlin?
- Renting an air conditioner in Berlin costs a private household €545 for the season with KlimaLegal's Standard Sommer-Abo (quiet portable unit) or €1,095 with the Premium version (mobile split unit), including delivery, setup and collection. Commercial rental firms in Berlin only quote prices on request.
- Can a tenant run an air conditioner without the landlord's permission?
- A tenant in Germany can usually run mobile air conditioners without landlord permission, as long as the building stays untouched: portable monoblocks, window units and mobile splits with a factory-sealed refrigerant circuit. A fixed split system with a wall opening needs the landlord's consent and installation by a certified firm.
- Do Berlin's big AC rental companies rent to private customers?
- Berlin's established AC rental firms such as Climate Energy, Deutsche Thermo, Atowik and KTG focus on business customers, with weekly or monthly rates quoted on request. Household extras like window seals or in-flat setup are not usually part of their packages.
- What happens if a rented unit breaks during the summer?
- If a unit in the KlimaLegal Sommer-Abo breaks, a replacement unit is delivered within 3 working days. There is no deposit, and end-of-season collection is included in the price.
- Can I keep the rented air conditioner permanently?
- On the Sommer-Abo Standard, a rent-to-own takeover (Mietkauf) is possible after two summers, so the unit stays with you instead of being collected. Terms are agreed directly with KlimaLegal.
