Mini split air conditioner



Verify ID:


Expiration date:

October 05, 2022 - October 04, 2023

Verification Mark

Applicable To:


Marketing Claim Verified by UL Solutions

Up to 55% better temperature stability

Verification Method

Products assessed under this investigation: Sample A: LG model: S4-Q09AA31B (9,000 Btu/h) Sample B: A representative 9,000 Btu/h model purchased in the open market in 2022. Test set-up: - 15 temperature sensors distributed inside a 20m³ volume chamber. - Temperature sensors distributed per INMETRO guidance document DOQ-CGCRE-028. - Initial chamber settings: 33.0 +/- 2.0 °C, 60.0 +/- 15.0 %RH - Mini split air conditioner set point temperature: 26° C - Total test time (Stabilization time + Operation time): 3h:40min - Minimum stabilization time: 1h:00min For each unit assessed: - Determine the point in time that the units achieved pull-down to the set point temperature. - After the pull-down period, use the data from the 15 temperature sensors to calculate the average temperature in the chamber every 15 seconds. - Calculate the standard deviation of the averages calculated in step 2 above. Temperature stability comparison is calculated as follows: (St. Dev Sample B - St. Dev Sample A) / St. Dev Sample B

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.