For the tens of millions of Europeans who rent

Balcony-solar cooling for European renters.

Klímr is a solar-ready portable air conditioner shaped end-to-end around renter constraints: no drill, no lease rewrite, no bill spike. Reversible installations, balcony-legal plug-in solar aligned with the latest UK tenant guidance, and storage sized to bridge the evening hours when the sun is down.

Reserve a unitSee how it installs

€999–€1,499 · ships across the EU · backed by Flemish clean-tech support · writes to klimr@polsia.app

Around€0on the next bill
Up to8 hbridge on a full afternoon
Zerodrill bitsin the kit
~ 45 minto reverse the install
What you actually get

Climate-grade cooling. Tenant-grade mounting.

Climate-grade means it stays in spec through a heatwave. Tenant-grade means it leaves your flat the way you found it.

No-drill mounting
Sits on a window-frame clamp and a balcony parapet stand. Reversible in under an hour — your deposit is yours when you leave.
Balcony-legal plug-in solar
A flat panel you lean against the railing. Aligned with the latest UK tenant guidance for plug-in solar — no permission chase, no neighbour wrangle.
Sized for 200–400 W daytime input
Charges from morning sun while you’re at work, ready by evening. No surge draw on your grid, no surprise on the next bill.
Storage sized for evening hours
A LiFePO4 buffer bridges the gap when the sun is down. Quiet through the night, cool through the morning.
Install

From box to cool bedroom in an afternoon.

No contractor, no lease amendment. Four steps, reversible at every stage.

01

Clamp in

The cooling module hangs on a window-frame clamp tightened by hand. No masonry drill, no anchor bolts. Weight stays on the frame, not the wall.

02

Lean the panel

The plug-in solar panel rests against the balcony railing, cable-led to the unit. Tilt set by your latitude so you get full sun on the window you already own.

03

Plug in once

A single plug into your existing outdoor socket completes the circuit. The unit auto-detects grid vs solar and routes accordingly.

04

Cool on your schedule

By the time the heatwave peaks, the buffer is full and the unit has been quiet all day. Run it through the evening — finally, bedrooms that sleep.

Renter fit

What a portable AC usually asks of you vs. what Klímr asks instead.

Most portable air conditioners were designed for a homeowner with a roof and a drill. Klímr was designed for the renter down the hall.

The usual ask
What Klímr does instead
No drill
Reversible installations
No lease rewrite
Aligned with UK plug-in solar tenant guidance
No bill spike
200–400 W daytime solar input
No noise at night
Quieter than a fridge, by spec
Spec sheet

Quiet to live with. Hardy enough for a heatwave.

Pairs a compact cooling module with a matched solar and LiFePO4 battery bundle. Sized for the typical 200–400 W of daytime input any well-positioned European balcony will produce.

Cooling capacity1,500 W peak · 700 W steady
Solar input200–400 Wp plug-in panel
Battery1.5 kWh LiFePO4
MountWindow-frame clamp, no drill
Sound38 dB(A) at 1 m, night mode
Weight11.4 kg cooling module · 6.8 kg panel
CoverageStudio / 1-bed flat (≤ 35 m²)
Cable4 m solar · 2 m grid, weather-rated
Reverse time~ 45 min, no trace
EU subsidies & policy

Designed to qualify. Priced to belong.

Plug-in solar and battery storage fall under many member-state residential clean-energy schemes — at home and at work. Klímr ships with the manufacturer declaration, CE paperwork, and per-invoice serial tracking that those schemes ask for.

Klímr is founded in Belgium and supported through Flemish clean-tech pathways. The company is led by Dr. Veronica Stahl — a practising dentist and the founder of CannIBite BVBA — who has already shipped a private-label consumer brand and brings prior VLAIO-backed venture experience to this one.

$0.73B (2025) → $1.14B (2034) European portable-AC market, opening to renters for the first time at this price band.

VS
Dr. Veronica StahlFounder, CannIBite BVBA
  • Practising dentist; sustained scientific background
  • Already shipped a private-label consumer brand
  • Prior VLAIO-backed venture experience
  • KLÍMR is the third act — clean-tech for renters this time
Questions

What renters ask first.

If yours isn’t here, write to klimr@polsia.app.

Reserve a Klímr

Cool the heatwave. Leave the drill bit in the box.

Tell us which flat and what balcony aspect, we’ll send you pricing for your country and the EU subsidy paperwork you’re entitled to.

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