Standard 2 (S12ET)

Overview and positioning

LG Electronics is one of a small group of manufacturers that produce air-conditioning compressors in their own plants — a fact that sets the Korean brand apart from suppliers sourcing components on the ODM market. The Dual Inverter compressor fitted in the Standard 2 is developed and made by LG, so quality control covers not just final assembly but the entire production chain of the unit's most critical component. The ten-year factory warranty on the compressor is a direct consequence of this engineering approach.

Standard 2 S12ET occupies the position of a solid mid-range model in the LG Electronics lineup — above the basic tier, without the premium pricing of advanced filtration packages. The unit suits a living room, bedroom or office of 25–35 m², where the priority is trouble-free cooling and heating year-round and convenient control from a mobile app. LeoKlima classifies it as Tier Above because LG's own-production compressor and long warranty reduce the risk of service costs over a ten-year ownership horizon.

The model launched in January 2022, meaning the S12ET runs current-generation control electronics and a Wi-Fi module compatible with the LG ThinQ ecosystem — a platform covering both air conditioners and other LG Electronics home appliances. For the user that translates into one app managing the air conditioner alongside other LG devices in the home or office.

Cooling and heating technology

At the core of the system sits the Dual Inverter compressor, which combines two technologies: a DC frequency-modulation drive and a twin-cylinder working chamber with offset pistons. The twin cylinder reduces vibration at the compression stage because the two cylinders' working cycles balance each other out — this is the main reason the Dual Inverter compressor achieves lower noise levels and longer service life than single-cylinder units of comparable output. DC modulation lets the compressor adjust output smoothly in response to the room's actual thermal load.

Nominal cooling capacity is 3.5 kW; maximum reaches 4.04 kW — useful when pulling a heavily heated room down fast on a hot day. The Jet Cool function activates a high-intensity airflow mode that produces a noticeable temperature drop within minutes. Heating mode at a nominal 3.5 kW and a maximum of 5.1 kW works well as a supplementary or primary heat source in flats during Polish shoulder months — autumn and early spring.

R32 refrigerant has replaced the older R410A: the GWP of R32 is 675 compared with 2,088 for R410A, and the system charge is smaller by roughly ten to fifteen per cent. Energy class A++ for cooling and A+ for heating confirm that the system runs efficiently under the typical climate conditions of Central Europe. Standard 220–240 V/50 Hz mains supply requires no dedicated circuit breaker or electrical modifications in most flats.

Comfort and air quality

Four-way airflow — six-position horizontal louvre control and left-right vertical louvre steering — allows the air jet to be aimed at any area of the room or deliberately away from fixed seating and sleeping positions. The six horizontal louvre presets can be selected via the remote or from the LG ThinQ app. The four-way swing distributes cool air to every corner of the room automatically, without the user having to switch between positions manually.

The Comfort Air function locks the louvres in a position that sends the airflow along the ceiling or wall rather than directly at people in the room. The feature is valuable during extended use — at a desk, in bed at night or at a dining table where a direct draught would be uncomfortable. Comfort Air is accessible both from the ThinQ app and via a single button on the supplied remote.

The Dual Protection filter traps dust particles larger than 10 μm — including pollen, pet dander and larger aerosol particles — before they reach the heat exchanger. The filter is washable: remove it from the indoor unit cassette, rinse under running water and refit. The Auto Cleaning function complements this by running an evaporator-drying cycle after each cooling session, preventing moisture from accumulating and stopping mould and odours from developing on the heat exchanger.

Indoor unit noise in the quietest fan speed (Sleep) is 19 dB(A) — comparable to the background level of a quiet room in the evening. The manufacturer rates normal speed at 27 dB(A), medium at 35 dB(A) and full power at 41 dB(A). Dual Inverter technology reduces mechanical vibration in the compressor, which keeps the whole system quieter than single-cylinder equivalents. The Active Energy Control feature lets the user cap power draw at 80%, 60% or 40% of nominal when holding down the electricity bill matters more than peak output.

Controls and Wi-Fi

The built-in Wi-Fi module connects the air conditioner to the LG ThinQ app on Android and iOS. Setup requires linking the unit to a 2.4 GHz home network — no additional gateways or adapters. Once commissioned, the S12ET appears in the app as a home device: check the current room temperature, change the operating mode, set the target temperature and fan speed, or build a weekly schedule. Remote access works from anywhere in the world as long as the phone has an internet connection.

The LG ThinQ app exposes every operating mode: cooling, heating, dehumidification, fan-only and auto. Energy management includes real-time power-consumption monitoring and the Active Energy Control mode, in which the user manually caps power draw at a chosen level. LG ThinQ supports voice control integration — Google Assistant and Amazon Alexa handle commands for the S12ET without additional plugins.

The supplied remote covers the full feature set without needing a phone — a large LCD display showing temperature and current mode makes everyday adjustments straightforward. Smart Diagnosis lets the unit run a remote self-check: the air conditioner produces a tone sequence that the app or the LG Electronics phone service centre analyses to identify a potential fault before a technician visits. Auto Restart restores the last settings after a power cut, which is convenient in unattended rooms.

Design and build

The LG Standard 2 S12ET indoor unit measures 837 mm wide, 308 mm tall and 189 mm deep — a compact footprint for a 3.5 kW wall-mounted air conditioner. The white casing and smooth, unadorned front mean the unit does not dominate the wall; it fits equally well in light Scandinavian interiors, office schemes in pale grey and classic apartment layouts. At 8.7 kg the indoor unit is easy for two installers to mount on a standard wall rail.

Gold Fin technology protects the outdoor unit's heat-exchanger fins from corrosion — the protective coating extends their service life in coastal environments, near high-traffic roads or in locations with elevated air pollution. The outdoor unit measures 717 × 495 × 230 mm and weighs 25.1 kg, fitting comfortably on a standard wall bracket or a ground base. The beige outdoor casing is less visually prominent on a building facade than typical white or grey enclosures.

Copper pipe runs can be routed to either side of the indoor unit; standard 1/4" and 3/8" flared connections ensure compatibility with any authorised service company in Poland. LG Electronics uses a common valve arrangement, which means relocation or repair work requires no proprietary tools or manufacturer-specific accessories.

Installation and service

The 5,642.04 PLN all-in price covers a standard installation: outdoor unit wall-mounted up to 5 metres from the indoor unit, copper pipes in premium insulation (Armacell or Ebrille), gravity condensate drainage to the sanitary stack and electrical connection to the nearest socket. The LeoKlima team performs a nitrogen pressure test, vacuum evacuation and a commissioning run with a full operating cycle. The customer receives a technical report with pressure-test results and refrigerant charge level.

An anti-vibration bracket under the outdoor unit is a standard part of every LeoKlima installation — it reduces vibration transferred to the building structure, which matters most in multi-family buildings where occupants may otherwise hear the compressor. Before every installation a LeoKlima technician carries out a free site survey: checking the pipe route, evaluating electrical conditions and identifying the optimal outdoor unit position. For flats on upper floors we recommend mounting the outdoor unit on the external building wall rather than on a balcony railing.

The ten-year LG Electronics factory warranty on the Dual Inverter compressor takes effect after product registration on the manufacturer's website; LeoKlima helps customers complete the registration paperwork at handover. Warsaw and the surrounding area have a dense network of authorised LG Electronics service points — in-season response typically stays within 48 hours. Smart Diagnosis reduces the time needed for fault identification, cutting unnecessary service call-outs and the travel costs that come with them.

Who this model is for — summary

LG Standard 2 S12ET 3.5 kW suits customers looking for an air conditioner with a documented compressor reliability record, built-in Wi-Fi and low noise — without moving into the premium segment of UV filtration or bactericidal lamp systems. The ten-year Dual Inverter compressor warranty has a concrete economic value: if the compressor fails after one year, five years or eight years from installation, the repair costs nothing for the owner. That is the point of difference that separates the S12ET from cheaper models carrying shorter warranties.

The unit performs well in bedrooms — quiet operation from 19 dB(A) in Sleep mode — in living rooms of 25–35 m² and in offices or studies where stable temperature without perceptible draughts is the priority. The comfort feature set — Comfort Air, four-way swing, Jet Cool, auto-cleaning and a weekly schedule in LG ThinQ — covers the needs of most residential users without paying for rarely used options.

Customers with larger budgets and requirements for UV filtration or deep air sterilisation should consider models from higher LG Electronics lines or units with a certified anti-allergen filter. If the priority is a lower price while keeping core functions, more economical alternatives are available in the LeoKlima range. Standard 2 S12ET occupies a position where the combination of Korean engineering, a long warranty and in-box Wi-Fi justifies the price clearly above the budget minimum.

The best way to decide is to book a free site survey — a LeoKlima technician will assess the room volume, external wall thickness and sun exposure, then confirm whether 3.5 kW is the right capacity. Submit a request via the form on the site or by phone on 502 010 010.

Installation quality affects unit efficiency throughout its service life — loose fittings, an inadequate system vacuum or a badly sloped condensate line can, over a few seasons, erase the energy advantage of A++ class. An installation crew with F-gas certificates, a pressure-test report and experience in concealed pipework is as important as the model choice itself.