Model comparison

LG LP1025WHSM vs LP1025WSSM vs LP0825WSSM

The LG LP1025WHSM and LP1025WSSM share the 10,200-SACC cooling tier, but only one exact manual documents Heat—and that one requires a drain hose during heating. The smaller LP0825WSSM is a separate cooling-only 8,350-SACC step. Compare model suffixes before treating an LG portable AC as interchangeable.

Same 10,200 cooling tier, different heating decision

LG lists the LP1025WHSM at 10,200 BTU/h SACC and 14,000 BTU/h ASHRAE. The LP1025WSSM is listed at those same cooling values, but its exact WSSM manual names Cool, Dry and Fan; one current WSSM page heading conflicts by saying “Cooling & Heating.” For a buying decision, the model-named manual and detailed mode list support treating LP1025WSSM as cooling-only. The H suffix is a distinct LP1025WHSM configuration with a separate manual and a documented Heat mode. Do not apply one manual to the other SKU.

The LG product page for WHSM calls the cooling configuration suitable for up to 450 square feet, while a model-coded gallery graphic says 350 square feet beside its 10,200-BTU label. The WSSM page makes an area estimate too, but an area claim is not a room-load calculation. Since LG's WHSM materials disagree, this guide does not select a winner by stated area. Check the actual sun exposure, ceiling, insulation, open doorways and internal heat before relying on either estimate.

LP0825WSSM is the lower cooling step

The LP0825WSSM is rated at 8,350 BTU/h SACC and 12,000 BTU/h ASHRAE. Its exact manual lists Cool, Dry and Fan, not heat. The capacity change is meaningful if you have a documented minimum: a 10,000-SACC requirement admits the LP1025 models but not LP0825. It is not an automatic reason to choose the biggest rating. Choose a cooling tier that fits the room load; do not compare a 14,000-BTU ASHRAE number directly with a 10,000-BTU SACC threshold.

Three suffix-specific plans

• LP0825WSSM: 8,350 SACC / 12,000 ASHRAE cooling, one flexible exhaust hose, Cool/Dry/Fan. The exact manual does not list heat.
• LP1025WSSM: 10,200 SACC / 14,000 ASHRAE cooling, one hose, Cool/Dry/Fan. Its page heading conflicts about heat; the model-named manual keeps this assessment cooling-only.
• LP1025WHSM: 10,200 SACC / 14,000 ASHRAE cooling plus Heat. Its separate manual requires a pump drain hose during Heat, indoor drainage near freezing, and frequent monitoring of the required 28-ounce-or-larger bucket if draining indoors.

All three manuals specify the same sliding-window span of 20 1/2 to 39 15/16 inches for vertical-slider width or horizontal-slider height. They use a single flexible exhaust hose; the manual warns not to extend or replace it with an unspecified hose. Measure the sash and plan a short, uncrushed route from cabinet to panel. The kit's span does not tell you whether your furniture placement or the hose bend will work.

Heat's boundary is not established by the indoor setting

On LP1025WHSM, the manual's control instructions allow a 60–86°F setpoint, and a separate operating-temperature table lists heating conditions of 68–80°F and 38–57% relative humidity. That table does not state an outdoor heat-pump minimum. Do not turn the 68°F figure into an outdoor low-temperature cutoff, or assume that the 12,000-BTU heating figure is an ASHRAE or DOE rating: LG lists it only as “Capacity (Heating).” If a minimum outdoor temperature is essential, choose a heat model whose exact manual explicitly gives that ambient range; the LG WHSM documentation reviewed here leaves it unknown.

The WHSM manual's drainage instructions are unusually important. Heat requires the pump-drain hose. Near 32°F, use indoor drainage into a bucket of at least 28 ounces and check it often; above freezing, outdoor drainage is allowed if the outlet is kept away from vulnerable surfaces. For Dry mode, a different 5/8-inch-ID garden hose may be connected to the continuous drain port. Do not mistake self-evaporation during typical cooling for a no-drain heating arrangement. The two WSSM models do not offer a documented heat mode, so their cooling manuals do not solve a heat requirement at all.

Make installation and routine care part of the choice

The WHSM page lists a 14 × 27 1/9 × 16 1/2-inch cabinet and 63.9-pound net weight. Its manual calls for a grounded standard 120-volt outlet and 15-amp circuit and says not to use extension cords, surge protectors or multi-outlet adapters. It also warns against changing the supplied vent hose. Filter cleaning is every two weeks; a full tank triggers an FL shutdown until emptied. These tasks are routine for a portable unit but make placement and drain access part of the fit check.

ThinQ, Wi-Fi, voice control, remote, timer, auto swing and Auto Restart are listed for the WHSM. The manual notes 2.4-GHz Wi-Fi and model-dependent ThinQ features. The WHSM's EnergyGuide confirms 7.9 CEER; its $119 seasonal cost example uses 13 cents/kWh and eight hours per day for three months, not a forecast for every household. LG's 50-dB low-speed marketing phrase conflicts with its table listing 54/51 under a High/Mid/Low heading, so there is no sound-level ranking here.

If cooling alone is the goal, read the individual LP0825WSSM and LP1025WSSM reviews and compare their cooling threshold. If the heater is essential and you can route its drain, read the separate LP1025WHSM review. If you cannot route a heat drain or need a documented outdoor low-temperature boundary, do not force this model into that plan; compare documented heat-capable alternatives such as the Midea MAP10HS1XWGR-T or Whynter ARC-1050XPH.

Sources: LG U.S. pages for LP0825WSSM, LP1025WSSM and LP1025WHSM; the exact-model manuals linked from the WSSM support pages and the LP1025WHSM manual copy hosted by Lowe's.