Air conditioner or heat pump for apartment buildings: rules, permits, and installation in practice
Published
Want a cooler home during heat waves, but not sure whether you're allowed to install an air conditioner or heat pump in your apartment building? This guide walks through what a housing company typically requires, where the outdoor unit can go, how noise and condensate water are handled, and which type of unit works best in an apartment.
Want the easiest route? With Coolflat's cooling package, the installation is done cleanly and we handle the housing company permits on your behalf.Get a quote (5 min)and you'll get a model recommendation and a transparent total price.
A quick checklist before you do anything
- Does your home have a balcony (the most common spot for the outdoor unit)?
- Does your housing company have guidelines for air conditioners and heat pumps (noise, appearance, condensate water, wall penetrations)?
- Are you after cooling, or heating too (heating is usually not allowed in apartment buildings)?
- Do you need housing company approval / a renovation notice?
- Is the installation being done by a professional (noise, vibration, sealing, and safety)?Read why it's not worth installing yourself.
Can you install an air conditioner or heat pump in an apartment building?
Short answer: usually yes, but it requires following your housing company's process.
A housing company can set conditions (e.g. around noise, appearance, condensate water, and wall penetrations). In practice, what matters is that the installation is done structurally correctly, cleanly, and without causing unreasonable harm to others.
Tip: if you don't know your housing company's practices, it's worth finding out before choosing a unit. Many "no" situations turn into "yes" once the installation method and details (sound dampening, drainage) are properly documented.
Where can the outdoor unit go in an apartment building?
Most often, the outdoor unit is mounted on the balcony in a way that doesn't visibly alter the facade.
A good "housing-company-friendly" installation takes into account:
- placing the outdoor unit low, often below the railing, so it's unobtrusive
- vibration damping, so structure-borne noise doesn't transfer into the building
- routing condensate water in a controlled way into the balcony's drainage or a drainable container
- a clean, sealed, code-compliant wall penetration for the pipes and cables
Will the neighbors hear it?
Noise concerns are the most common reason a housing company sets conditions.
Noise and vibration stay under control when:
- a quiet model suited to apartment buildings is chosen
- the installation is done correctly (vibration dampers, sensible placement, mounting)
- contact between the outdoor unit and the building structure is minimized
A good rule of thumb: a housing company usually isn't afraid of the unit itself, it's afraid of a poor installation. That's why documentation plus a professional installer is what settles it.
Condensate water and winter use in an apartment
During cooling, the indoor unit collects moisture, and the condensate water needs to be drained away in a controlled way. This is one of the most important technical points in the permit process.
Some housing companies set restrictions on winter use, since moisture or ice can build up around the outdoor unit on a balcony. In apartment buildings, an air conditioner or heat pump is in practice most often bought primarily for cooling.
How to choose the right air conditioner or heat pump for an apartment
The key selection criteria for a unit that suits an apartment are:
1) Cooling performance
You want efficient, even cooling without a "draft" feeling. A model optimized for cooling is usually the sensible choice. If you're offered a model that also does heating, you may end up paying for unused "winter features" (good heating efficiency and built-in defrost heaters) you'll never actually need.
2) Quiet operation
Housing companies interpret official noise guidelines differently. Some cap the outdoor unit's average sound pressure at 45 dB. Others (and we think this is the more correct reading) cap the average sound pressure measured under a neighbor's window at 45 dB. Either way, choose a model with a quiet indoor unit too, so you sleep well yourself.
3) The right capacity for your home's size
Too small → it can't keep up on hot days. Too large → room humidity condenses more easily on pipes that get too cold during heat waves → possible moisture damage indoors. A good installer sizes the unit based on your home's square meters, floor plan, and sun/window exposure.
Frequently asked questions about air conditioner and heat pump installation in apartment buildings
Can a housing company refuse the installation?+
It can set conditions, and in some cases refuse if it would cause unreasonable harm. In most cases, good planning finds a way through.
Do I need to file a renovation notice?+
Almost always, yes. Not usually when simply replacing an existing unit, but housing company practices vary.
Is a balcony required?+
In practice, the outdoor unit is mounted on the balcony in most apartment buildings. Without one, a ground-floor terrace is the usual alternative.
Where does the condensate water go?+
Usually into the balcony's existing drainage. What matters most is that it's done in a controlled way, following the guidelines.
How long does installation take?+
A well-planned installation is often finished in under 5 hours, depending on the specific home.
Does an air conditioner or heat pump interfere with the building's ventilation?+
It only recirculates air through its own indoor unit, so it has no effect on the building's ventilation system.
Can it heat as well as cool?+
Technically, often yes, but in an apartment, the benefit and the housing company's rules determine whether that's practical. For the best price, a cooling-only model usually makes more sense, so you're not paying for winter features you won't use.
Will the neighbors hear it?+
A correctly chosen and correctly installed unit is typically unnoticeable. Vibration damping is the key: in balcony installations, the outdoor unit isn't fixed directly to the building structure.
