It's a worry many German renters share in a heatwave: am I even allowed to cool my flat, or can my landlord say no? The reassuring news is that the cooling that suits renters best is also the cooling that's generally allowed. Here's a practical overview.
The line: permanent vs portable
The key distinction in most rental situations is between permanent and portable. A landlord can generally restrict permanent changes to the building — drilling through walls or window frames, installing a fixed split air conditioner, mounting an outdoor unit, or anything that alters the structure or facade. What they typically can't forbid is your use of portable, freestanding, removable appliances. If it leaves no mark and changes nothing about the building, you're usually on safe ground.
What's generally allowed
For most renters, the practical cooling toolkit is fine without permission:
- Fans — purely plug-in, nothing to install. See fans in stock.
- Evaporative air coolers — plug-in, no hose, no fixings. See air coolers.
- Mobile air conditioners vented through a no-drill window sealing kit — removable, no marks. See mobile ACs.
All of these are portable and reversible, which is exactly why they normally fall outside a landlord's power to forbid.
What usually needs permission
Where you do need to ask is anything permanent: a fixed split system, drilling holes for a wall vent, mounting brackets, or altering windows. These change the building and can't be easily reversed, so they generally require the landlord's consent — and may be refused. Avoiding permanent modifications keeps you clearly within typical tenancy rules.
Check your lease and ask if unsure
General principles only go so far — your specific lease may contain unusual clauses, and individual situations vary. So check what your rental agreement says, and if you're genuinely unsure whether something is allowed, ask your landlord. A portable mobile AC with a no-drill kit is rarely a problem, but a quick check or conversation removes any doubt and protects your deposit.
Be considerate, too
Beyond the rules, being a good neighbour and tenant helps. Position a mobile AC's hose tidily, avoid anything that drips or marks, and be mindful of noise for neighbours. Keeping your setup clean, removable, and unobtrusive makes it a non-issue for everyone and keeps your tenancy smooth.
The takeaway
A landlord can generally forbid permanent changes but typically not your use of portable, removable cooling like a fan, air cooler, or mobile AC with a no-drill window kit. Check your lease, avoid permanent modifications, and ask if unsure. Then check which renter-friendly units are in stock near you.
This is general guidance, not legal advice. For your specific rights, consult your lease and current German tenancy law or a qualified advisor.