Yes, most modern split and multi-split systems are reversible heat pumps and can also heat efficiently, making them an ideal complement or alternative to traditional heating.

Since the compressor (the noisiest component) is located outside the living space, both systems are very quiet. However, the outdoor unit of the multi-split system is more powerful and can therefore be slightly louder at full load than a single mono-split outdoor unit.

The most common indoor units are wall-mounted. Multi-split systems often allow for the combination of ceiling cassettes, ducted units (invisible in the ceiling), or console units.

Electricity costs depend heavily on the energy efficiency class of the unit (A+++ is best), the frequency of use, the set temperature, and the room size. Modern inverter air conditioners (both split and multi-split) continuously adjust their output to the demand. This makes them significantly more efficient than older models. With normal operation (e.g., 4–6 hours daily), you can expect costs between €0.50 and €1.50 per day per indoor unit .

Inverter technology is the key to the high efficiency of modern split and multi-split systems. It allows the compressor to continuously regulate its speed instead of constantly switching on and off. The result: more consistent temperature control , lower energy consumption , and a longer lifespan for the components. Only this technology enables multi-split systems to optimally meet different performance requirements simultaneously.

Yes, in many regions you can take advantage of government subsidies , especially if the system is used for heating (as an efficient air-to-air heat pump). Find out about programs like the Federal Funding for Efficient Buildings (BEG) or regional grants that financially support the installation of highly efficient heat pump systems – including split and multi-split systems. A specialist company can advise you on this.

To ensure maximum efficiency and longevity , annual maintenance should be carried out by a qualified technician. This includes checking the refrigerant lines, professionally cleaning the filters, and testing the system for leaks. Regular filter cleaning (every 2-4 weeks), which can be done yourself, improves air quality and noticeably reduces energy consumption.

Generally, you don't need a building permit to install an outdoor unit – especially for single-family homes. However, it's important to comply with local noise regulations and minimum distances to neighboring properties. For condominiums or installations on listed buildings, you must obtain the approval of the owners' association or the historic preservation authority .