A horizontal sliding wall system, comprising a ceiling guide with at least one running track, as well as at least one door leaf element, which is connected to a roller carriage, which is disposed to be displaceable in the ceiling guide, • wherein the running track is formed from a first material having a thermal conductivity of 75 to 235 W m -1 K -1, and a linear thermal expansion coefficient of 21 to 24*10 -6 K -1, and • the running track is configured to be essentially U-shaped, wherein ∘ the free branches of the U-shaped running track form the frontal faces (301a, 301b) of the running track, and ∘ running surfaces (302a, 302b) for guiding the roller carriage are conformed to the free branches of the U-shaped running track, and • wherein the sliding wall system comprises a thermal separation profile, ∘ wherein the thermal separation profile abuts against at least one of the frontal sides (301a, 301b) of the running track via means for releasably fixing the thermal separation profile at the running rail, ∘ wherein the thermal separation profile includes at least one connecting means (323a, 323b), preferably at least two connecting means (323a, 323b) for the reception of a running track screen with corresponding connecting means (351a, 351b) for the releasable connection of the thermal separation profile to the running track screen, • wherein the running rail screen is formed from a third material having a thermal conductivity of 75 to 235 W m -1 K -1, and a linear thermal expansion coefficient of 21 to 24*10 -6 K -1, characterized in that • the thermal separation profile is made from a second material having a thermal conductivity of 0.02 to 0.1 W m -1 K -1, and a linear thermal expansion coefficient of 40 to 300*10 -6 K -1, and • a groove-like guidance for the reception of the free bristle ends of a brush is provided in the thermal separation profile. • wherein the running track is formed from a first material having a thermal conductivity of 75 to 235 W m -1 K -1, and a linear thermal expansion coefficient of 21 to 24*10 -6 K -1, and • the running track is configured to be essentially U-shaped, wherein ∘ the free branches of the U-shaped running track form the frontal faces (301a, 301b) of the running track, and ∘ running surfaces (302a, 302b) for guiding the roller carriage are conformed to the free branches of the U-shaped running track, and ∘ the free branches of the U-shaped running track form the frontal faces (301a, 301b) of the running track, and ∘ running surfaces (302a, 302b) for guiding the roller carriage are conformed to the free branches of the U-shaped running track, and • wherein the sliding wall system comprises a thermal separation profile, ∘ wherein the thermal separation profile abuts against at least one of the frontal sides (301a, 301b) of the running track via means for releasably fixing the thermal separation profile at the running rail, ∘ wherein the thermal separation profile includes at least one connecting means (323a, 323b), preferably at least two connecting means (323a, 323b) for the reception of a running track screen with corresponding connecting means (351a, 351b) for the releasable connection of the thermal separation profile to the running track screen, ∘ wherein the thermal separation profile abuts against at least one of the frontal sides (301a, 301b) of the running track via means for releasably fixing the thermal separation profile at the running rail, ∘ wherein the thermal separation profile includes at least one connecting means (323a, 323b), preferably at least two connecting means (323a, 323b) for the reception of a running track screen with corresponding connecting means (351a, 351b) for the releasable connection of the thermal separation profile to the running track screen, • wherein the running rail screen is formed from a third material having a thermal conductivity of 75 to 235 W m -1 K -1, and a linear thermal expansion coefficient of 21 to 24*10 -6 K -1, • the thermal separation profile is made from a second material having a thermal conductivity of 0.02 to 0.1 W m -1 K -1, and a linear thermal expansion coefficient of 40 to 300*10 -6 K -1, and • a groove-like guidance for the reception of the free bristle ends of a brush is provided in the thermal separation profile.