Part of the Prologue collection, Grundig’s Home Comfort line includes single- and multi-split air conditioners. Top of the line is the Prologue GR9 A+++ series that is available in the 9000, 12000 and 18000 BTU versions and is distinguished by energy savings and Wi-Fi connectivity. The products feature an Inverter motor and have certified performance up to outdoor temperatures of +50° C in cooling mode and up to outdoor temperatures of -15° C. They are also equipped with the Actifour filtration system, consisting of four filters. In particular, the Catechin filter removes odors and dust, and the Photocatalyst filter eliminates germs; the Nano-silver Ion filter, a silver ion air purifier, is able to ensure healthy air, while the HEPA filter effectively eliminates pollen, dust, pneumobacillus, blocking up to 99.995% of pollutant particles having a diameter of 0.3 microns or more. Other technologies are: the Self-Clean+ function and the ION PRO technology that emits positive and negative ions at high concentration with an inhibitory effect on viruses.