Air Conditioning in Switzerland: Permits, Landlords and Your Options

Switzerland does many things brilliantly. Cooling apartments is not one of them. The Local summed up the expat experience in a June 2026 opinion piece titled "In Switzerland it's easier to get a work permit than an air conditioning permit". If your flat is sitting at 29 °C and your landlord shrugs, that headline feels accurate. The full picture is more useful: the strict rules apply to fixed installations, and there is a whole category of serious cooling that avoids them. This guide covers what needs a permit, what needs your landlord's signature, what the six most-asked-about cantons require, and what you can set up this week without asking anyone.

Do you need a permit for air conditioning in Switzerland?

For a mobile unit: no. A device that stands in your flat or on your balcony, with nothing drilled or permanently mounted, needs no building permit and no landlord consent. A fixed split system with an outdoor unit on the facade is a different story: it needs the landlord's written consent, a building permit, and in western Switzerland an energy authorization on top. Noise rules apply to everything.

Swiss AC law has three layers. First, building law: Article 22 of the federal spatial planning act says buildings and installations may only be erected or altered with official authorization (Art. 22 RPG). A permanently mounted outdoor unit alters the building, so it triggers a permit. Second, energy law: the cantons regulate "comfort cooling" through their own energy acts, strictest in Geneva and Vaud. Third, noise law: the federal noise ordinance sets limits that apply to fixed and mobile units alike. A portable device without fixed installation only ever touches the third layer, plus your rental contract.

Why is fixed air conditioning so rare in Switzerland?

Because cantonal energy laws long treated comfort cooling as wasteful luxury, and the permit process still reflects that. The numbers are stark: the city of Zurich approved roughly 150 AC units per year between 2022 and 2024, Winterthur about 15, according to the cantonal government's own decision RRB 1082/2025. In Geneva, every fixed installation needs a cantonal energy authorization with proof of need.

The mood is shifting, slowly. As Le News reported: "many Swiss residents continue to rely largely on fans, shutters and portable cooling units. But the pressure to relax restrictions... is likely to grow." Bern's cantonal parliament voted in March 2026 to replace the building permit with a simple notification for quiet, efficient units running on self-generated solar power (swissinfo), and Zurich is consulting on a simplified procedure for small fixed units. None of it is in force yet. For summer 2027 the practical rule stands: fixed is slow, expensive and uncertain. Mobile is immediate.

What can you install as a tenant without asking anyone?

Anything that does not alter the flat: fans, a monoblock air conditioner, or a portable split whose thin line runs through a sealed window opening. Swiss tenancy law requires landlord consent only for renovations and changes to the rented property (Art. 260a OR). A plugged-in appliance is not a change to the property. The Swiss Tenants' Association confirms that mobile units generally need no consent when no wall is pierced (Mieterverband).

Homegate's English tenancy guide says the same: tenants are "usually free to use a monoblock air conditioning system in a rental apartment". The community wisdom of the expat forums matches Swiss law neatly. As one member put it in a Geneva thread: "Anything that involves altering the fabric of a property (including the window glass) will require permission from the owner." Flip that sentence around and you have the whole rule: alter nothing, ask nobody.

Two Swiss-specific notes for newcomers. First, everything in this category plugs into a normal T13 household socket, so no electrician is involved. Second, your building has a Hausordnung, the house rules attached to most Swiss leases. It cannot ban a normal household appliance, but its quiet hours bind you, typically 22:00 to 06:00 or 07:00 plus Sundays. Telling your landlord or the Verwaltung (management company) before an outdoor unit appears on your balcony costs nothing and prevents most conflicts.

When do you need your landlord's permission?

The moment anything is fixed to the building: a bracket drilled into the facade, a permanent opening in the wall, a replaced window pane, a unit bolted to the balcony structure. For any such alteration, Art. 260a OR demands the landlord's written consent. A verbal OK from the caretaker is worth nothing if the management changes its mind.

Consent alone is not the end of it, because a fixed installation also triggers the public permits described below. In practice most Swiss landlords simply refuse: they would carry the permit process, the facade change and the complaints of every other tenant. One forum veteran told a Geneva renter exactly what to expect: "I very much doubt you'd be allowed to install anything permanently." That assessment has not aged.

If you own your flat, the logic shifts but does not disappear. In a Swiss condominium (Stockwerkeigentum) the facade and the outward appearance of balconies are common property, so a fixed outdoor unit needs a decision of the owners' community. A mobile unit that is merely placed on your balcony is normal use of your own flat, subject to the building's Reglement.

Which cantons require a permit for a fixed split system?

In practice all of them: a permanently mounted outdoor unit needs a building permit from the municipality everywhere we have checked. The differences sit in the energy layer. French-speaking cantons add an energy authorization with proof of need or renewable-power conditions. German-speaking cantons mostly check efficiency and noise inside the building-permit file. Mobile devices without fixed installation are permit-free in all six cantons below.

Canton	Fixed split system	Mobile unit, nothing drilled or mounted	Official source
Zurich (ZH)	Building permit from the municipality (§ 309 PBG). Simple applications in the city of Zurich take about 20 working days; roughly 150 approvals per year	No permit. The cantonal government expressly calls non-fixed units "bewilligungsfrei" (permit-free)	RRB 1082/2025
Geneva (GE)	Energy authorization from the canton (OCEN) for every fixed installation: proof of need or 80 percent waste-heat recovery, fee of CHF 10.– per kW	Mobile single-unit devices (monobloc) expressly exempt. Portable splits are not named; keep them strictly non-fixed	ge.ch
Vaud (VD)	Energy authorization or municipal notification; new fixed cooling must cover at least 50 percent of its electricity from renewables; a new energy law arrives in January 2027	No permit	vd.ch
Bern (BE)	Building permit, restrictive practice; parliament voted in March 2026 to switch to a notification for quiet, efficient, solar-powered units, not yet in force	No permit	swissinfo
Basel-Stadt (BS)	Energy approval from the canton with strict preconditions: insulation and shading must come first; very hard in older buildings	No permit	bz Basel
Ticino (TI)	Licenza edilizia (building licence) via the municipality; authorities estimate about half of installed units have none, and fines with retroactive proceedings are possible	No permit	Osatech canton guide

"No permit" in the mobile column means no building or energy permit. Noise rules, house rules and your duty of care as a tenant still apply everywhere.

Geneva deserves one honest caveat. Its exemption names mobile devices "composed of a single unit (monobloc)". A portable split has two units. It is not a fixed installation, so by the logic of the regime it falls outside it, but the canton has never said so expressly. Our advice for Geneva: keep the device strictly non-fixed, never drill or mount anything, and ask the cantonal energy office (OCEN) before any permanent or commercial use. Nobody can honestly promise you more than that.

Rules checked in August 2026. Three changes are in the pipeline: Bern's notification regime, Zurich's simplified procedure, and Vaud's new energy law from January 2027. We update this page when they land.

What are the noise rules for air conditioners?

The federal noise ordinance (LSV) sets planning values measured at your neighbour's open window: 55 dB(A) by day and 45 dB(A) at night in residential zones, with night running from 22:00 to 06:00. These limits apply to mobile units as well as fixed ones; the official enforcement aid for cooling equipment states this explicitly (Cercle Bruit).

What this means in practice: an indoor unit at 39 dB(A) is about as loud as a quiet library, and nobody outside your bedroom will ever hear it. The outdoor unit is the part your neighbours could notice. By day, a compact unit on a normal balcony is unproblematic. At night, the margins get thin if the neighbour's bedroom window is only a few metres away. Zurich's government makes the same point in its 2025 decision: AC noise is most sensitive in summer precisely because people sleep with open windows. Three habits keep the peace: place the outdoor unit away from the nearest bedroom window, use silent mode in the evening, and let a timer switch the unit off at 22:00 once the room is cool. And one Swiss habit beats all regulation: a two-minute conversation with the neighbour below before the first heatwave.

What is a portable split, and why does it avoid the permit question?

A portable split is a real split air conditioner in two parts: the compressor sits outside on the balcony, the quiet unit inside, connected by a thin line of about 2.7 cm that passes through a tilted, sealed window. Nothing is drilled, nothing is mounted, the building is untouched. Legally that makes it a household appliance, not a construction project.

The canton of Zurich puts it in exactly those terms: non-fixed devices are "nicht festinstallierte und damit bewilligungsfreie" units, not fixed and therefore permit-free (RRB 1082/2025). The NZZ reported the same for the city of Zurich: mobile devices that are not permanently installed need no permit.

The performance difference to the classic monoblock is not subtle. A monoblock pushes its exhaust through a fat hose out of an open window, which pulls warm air back into the room and keeps the machine at 55 to 65 dB(A) next to your head. Stiftung Warentest found mobile monoblocks "flexible but not very efficient" in its comparison, with split designs clearly ahead (test.de). A portable split keeps the loud half outside and the window closed on a seal.

About that window: one forum member described building "a custom cardboard contraption" to vent his unit. That problem has a boring solution today. A window seal made for tilt windows and balcony doors closes the opening around the flat line with zips and Velcro, works with the Drehkipp windows found in most Swiss flats, and leaves no trace when you move out.

Honest limits, so you are not surprised: the indoor unit of a Midea PortaSplit weighs around 45 kg, so the stairs are a two-person job. The line between the units is 2 m, so the indoor unit lives near the window or balcony door. The outdoor unit releases condensate and needs a spot where dripping bothers nobody. And the rules that survive are the ones above: quiet hours, house rules, and your duty to prevent condensation damage. One final edge case: if you ever bolt the outdoor unit to the facade, you have converted it into a fixed installation, and the whole permit chapter applies to you after all.

If the real problem is your flat rather than the device, start with our guide on what tenants can do when the apartment is too hot.

Frequently asked questions

Do I need my landlord's permission for a mobile air conditioner?

No. A mobile device does not alter the rented property, so Art. 260a OR does not apply and no consent is needed. Your duties remain: respect quiet hours, prevent condensation damage, follow the house rules. We still recommend a short heads-up to the management. It costs nothing and builds goodwill for the day you need something from them.

How do I vent the hose without ruining the window?

With a window seal kit: a textile or panel seal that closes the tilted window around the hose or line and comes off without a trace when you move out. For a portable split the line is only about 2.7 cm thick, so the window closes almost completely onto the seal. No drilling, no glass cutting, nothing your deposit will miss.

Will my neighbours complain about the noise?

Not about a 39 dB(A) indoor unit; they will never hear it. The outdoor unit is the one to manage: keep it away from the nearest bedroom window, use silent mode in the evening and a timer at night. The night planning value in residential zones is strict at 45 dB(A) at the neighbour's open window, but a compact unit used sensibly stays clear of trouble.

Is it worth over CHF 1'000.– for a few hot weeks?

One forum skeptic put the Swiss summer at "30-60 days of hot weather", and that is the honest frame. If your flat stays under 26 °C, save the money. If you sleep badly for six weeks every year, a portable split with heating function spreads its cost across the whole year, because it also heats efficiently in spring and autumn.

Which unit works for a top-floor flat of 25 to 60 m²?

A 3.5 kW class device like the Midea PortaSplit or the SplitClima S12. As a rule of thumb, plan 60 to 100 W of cooling per m², more under a hot roof. The smaller 2.35 kW PortaSplit Cool suits single rooms. For big flats, cool the bedroom properly instead of chasing the whole floor plan.

Why is everything sold out, and when can I buy?

Demand for portable splits exploded after two record summers and the PortaSplit's TIME award, and Swiss retailers sell each batch within days. Our lineup is sold out too. The next batch arrives in spring 2027, and the free waitlist gives you 48 hours of early access before it goes public. More stock questions are answered in our FAQ.

Can I sleep with it running?

Yes, and that is the main reason people buy one. At 38 to 39 dB(A) the indoor unit is quieter than most fans. For the outdoor unit at night, use silent mode or let the timer switch off at 22:00 once the bedroom is cool; a properly cooled room stays comfortable for hours afterwards.

How heavy is a portable split? Can one person set it up?

Setting it up, yes: connecting the quick coupling and fitting the window seal takes under half an hour with no tools. Carrying it, mostly no: the PortaSplit's main unit weighs around 45 kg, and the most repeated warning in Reddit reviews is exactly that: "If you need to move it in stairs, you'll need help." Plan a second person for delivery day.

Ready for a summer without paperwork? Browse our portable split air conditioners: real 3.5 kW cooling that needs no permit, no drilling and no landlord signature, shipped free from a Swiss warehouse with a 2-year warranty handled in Switzerland. The spring 2027 batch is reserved through the free waitlist, which gives you 48 hours of early access before public sale.