LG H24S1D (24,000 BTU, 6.6 kW) - DUALCOOL Deluxe wall-mounted inverter air conditioner rated A+++

H24S1D: the largest wall unit of the Deluxe series

The H24S1D closes the DUALCOOL S1 Deluxe line: 6.6 kW of cooling, 7.5 kW of heating, 24 000 BTU and up to 70 m² on the card. The indoor unit is identical to that of the 18 000 BTU model - 998 by 345 mm, 210 mm deep, 13.5 kg - so on the wall the two cannot be told apart. The whole difference sits in the outdoor module: 950 by 834 by 330 mm and 46 kg against 38 kg on the H18S1D (item 1802), a taller casing with a larger coil and a stronger compressor. The series holds class A+++ in cooling even at this capacity, and for a single-phase 6.6 kW machine that is genuinely good. Indoor noise of 26 dB(A) is the highest in the series, yet still quieter than a half-voice conversation in the same room.

70 m² from one wall unit: an honest assessment

The card says up to 70 m², and that is a figure for ideal conditions: one regularly shaped volume, ceilings up to 2.7 m, no partitions and no second level. The throw of a 24 000 BTU unit reaches roughly 12-14 metres along the ceiling, so in a long space the unit goes on the end wall rather than the side - otherwise the far third of the floor area stays untreated. Practical experience is simple: one wall unit over 70 m² leaves a 2-3 degree spread between the zone under it and the far corner, which is fine for a warehouse or a large workshop but not for an office full of people. If the space is divided into rooms, has a corridor or a mezzanine, a 24 000 BTU wall unit is the wrong answer regardless of capacity. In those cases the choice is a CL24R cassette (item 1827), a CT24R ducted unit (item 1837) or two smaller machines spread around the space.

A 46 kg outdoor unit 834 mm tall

The outdoor module of the H24S1D, 834 mm tall and weighing 46 kg, looks large on a facade, and its fixing deserves a calculation rather than a guess. In a detached house the right answer is a frame or a ground platform on vibration mounts, raised 30-40 cm, with 50-60 cm of free space in front of the grille. On an apartment facade it needs anchors into a load-bearing wall and brackets with a twofold margin; a ventilated facade or insulation layer will not carry it. In winter a serious amount of defrost water collects beneath the unit - up to several litres a day during heavy heating - so there should be no path, porch or parking space below it. A unit with this much coil area also needs proper access: it is washed once a year, and every few years the impeller and the drain pan are inspected.

Runs up to 30 metres and the pipework

The card lists a 1/4 inch (6.35 mm) liquid line and a 5/8 inch (15.88 mm) gas line with a maximum run of 30 m and 15 m of height difference; the diameters for a specific delivery are worth confirming against the data sheet when ordering, because for machines of this output manufacturers often specify a 3/8 inch liquid line. A 30 metre run is real planning freedom: the outdoor unit can sit behind an outbuilding, in the far corner of a yard or on a roof, taking both noise and appearance away from the windows. The price is a refrigerant top-up at the specified rate per metre, oil traps on vertical sections longer than 5-6 metres and stricter evacuation: the system volume is large and residual moisture tells sooner. Each pipe is insulated separately, joints are sealed, and an outdoor run gets additional UV protection: unprotected insulation crumbles within two or three seasons. All of this belongs in the design up front - reworking a 30 metre run after the finishes are done is effectively impossible.

Electrics: 6.6 kW of cooling from a single phase

The machine runs from a single-phase 220-240 V, 50 Hz supply and at full cooling draws roughly 2-2.3 kW, around 10-11 A. For that load a 2.5 mm² circuit is already at its limit: the correct approach is 4 mm² copper with a breaker chosen to the design, especially where the distance from the board to the unit exceeds 20 metres. In a house with a single-phase service of 5-6 kW this machine is planned together with the rest of the load: a water heater, an electric hob and this unit starting together can trip the main breaker. An inverter start removes the surge problem but not the limit on average service capacity. Where the mains voltage sags, a protection relay and a stabiliser become mandatory: repairing the inverter board of a machine in this class is the most expensive fault there is.

7.5 kW of heating and the limits of use

Seven and a half kilowatts of heat is serious: enough to hold comfort in a 60-70 m² space through the shoulder seasons with no other heating. For LG residential R32 splits, cooling is quoted from roughly -10 to +48 °C and heating down to about -10 °C of outdoor temperature, with exact limits checked against the data sheet. In frost the heating output falls and the machine goes into defrost cycles, so planning winter heating of a workshop or a shop around it is unwise. Where heating below zero is required, Therma V heat pumps do the job - for instance the HU161MA.U33RU (item 1884) with a heating circuit and domestic hot water. As a heat source in October and November or March and April, though, this machine delivers the lowest cost per kilowatt-hour of heat among all electric options.

Which jobs it fits and where it is out of place

The H24S1D makes sense where there is one large, regularly shaped volume: a sales floor, a large studio, a workshop, a small-format gym, a production space with people in it, an open-plan office without partitions. Class A+++ makes it rational precisely for sites where the machine runs many hours daily rather than for one week in July. Where the model is out of place: spaces with separate rooms, corridors and zones; halls with ceilings above 3.5 metres; server rooms and anything cooled year round, which need a low-ambient kit. Nor is it wise to put a 24 000 BTU machine in a 30-35 m² room as insurance for the future: it would cycle in short bursts, delivering neither comfort nor savings. And if the site is a flat, remember the 60 dB(A) of the outdoor unit and its 46 kg: not every facade and not every neighbour will tolerate that.

How it differs from neighbouring models in this catalogue

The H18S1D (item 1802) is the 18 000 BTU machine of this series: 5.0 kW of cooling, 50 m², a 1/2 inch line, a 25 m run and a 38 kg outdoor unit - cheaper and simpler to install at the same A+++ class. The WZ24AWN (item 1807) is the plain 24 000 BTU option at 6.95 kW of cooling in class A++ and 31 dB(A): cheaper to buy, dearer to run. The PC24SQ (item 1809) is the Standard Plus 6.6 kW machine with Wi-Fi in class A++: a simpler design for the same kilowatts of cooling. The S24EQ (item 1811) is the same capacity in the Eco version, without Wi-Fi and controlled only by the infrared remote. The CT24R (item 1837) is a cassette of the same output: a more expensive installation requiring a suspended ceiling, but with even four-way air distribution, which for a 70 m² space is usually the better engineering answer than a wall unit.

Send us a floor plan, the ceiling height and a photo of the facade where the outdoor unit could go, and we will work out whether a 24 000 BTU wall unit is right here - and propose an alternative if it is not.