LG LT1033HNR Review: 10,000 BTU 230V Wall AC with Heat
LG's newer 10,000 BTU heat and cool wall unit for rooms up to 450 sq ft, with supplemental heat, a 230V plug, a 54 dB listing and LG's universal 24 inch chassis.
By Daniel Brooks
Updated October 22, 2026
The LG LT1033HNR is LG’s 10,000 BTU heat and cool wall unit, sized for bedrooms, home offices and small living rooms of up to 450 square feet. It cools in summer, adds supplemental electric heat on cooler days, and runs on a 230 volt circuit. LG lists a low 54 dB, and the unit shares the 24 inch chassis of LG’s other wall models. It has a 3.5 out of 5 average from 18 ratings in our through-the-wall air conditioners with heat category.
Our Verdict
The LT1033HNR is a tidy all-season choice for a room of about 25 by 18 feet in a building with 230 volt sleeve outlets. It has two cooling, heating and fan speeds, 4-way air deflection, a 24 hour timer, an energy saver option, auto restart, a check filter alert and a remote, and the trim kit and mesh filter come in the box.
The limits are familiar. The heat is supplemental rather than a primary heating system, the sleeve is sold separately, and there is no Wi-Fi. It also has fewer ratings than LG’s larger heat model, so its track record is still building.
LG LT1033HNR 10,000 BTU Through the Wall Air
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | LG |
| Model | LT1033HNR |
| Type | Through-the-wall air conditioner with supplemental heat |
| Cooling Capacity | 10,000 BTU |
| Room Size | Up to 450 sq ft |
| Power | 230 volts |
| Max Wattage (listed) | 2900 watts |
| Efficiency | 9.8 (listed) |
| Noise Level | 54 dB (listed) |
| Fan Speeds | 2 cooling, heating and fan speeds |
| Dehumidifying | 3.2 pints (listed capacity) |
| Dimensions | 24 x 14.41 x 20.09 inches (W x H x D) |
| Weight | 70 pounds |
| In the Box | Unit, remote, mesh filter, trim kit |
| Warranty | 1 year parts and labor |
Cooling Capacity and Room Size
LG rates the LT1033HNR for rooms up to 450 square feet and describes it as ideal for medium rooms of about 25 by 18 feet. That is the top of the 10,000 BTU band in the ENERGY STAR chart below, so the rating is realistic for a primary bedroom, an office, a guest suite or a small living room.
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Adjust for your room: reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
Supplemental Heat
For cooler days, the supplemental heat option adds warmth through the same fan and louvers that deliver cooling. LG positions it for steady temperature in a bedroom or office. That makes it a good fit for rooms that run cold in spring and fall, rooms at the end of a long duct run, or apartments where the building heat comes on late in the season.
Like all electric resistance heat, it works best as a supplement. LG lists a maximum of 2900 watts for the unit, which reflects the heating element’s draw. Running it for long periods in a cold winter will cost more than a heat pump or a central system, so plan on it for comfort on cool days rather than as your only heat.
Power Requirements
The LT1033HNR runs on 230 volts. Check the receptacle beside your sleeve and the plug type in LG’s installation guide before you order, because a 230 volt plug will not fit a standard household outlet. Many apartment sleeves already have the right outlet, since heat and cool wall units are common in multifamily buildings.
Installation and Sleeve Fit
The chassis is 24 inches wide, 14.41 inches tall and 20.09 inches deep, the same footprint as LG’s other wall units, so it can replace an older LG unit in the same sleeve. The sleeve is sold separately. The box includes the remote, a mesh filter and a trim kit for a clean indoor finish. At 70 pounds, it is lighter than LG’s larger heat model, but two people should still lift it in.
Noise and Efficiency
LG lists 54 dB, which is quiet for a heat and cool wall unit and makes the LT1033HNR a reasonable bedroom choice. The listed efficiency figure of 9.8 is typical for a conventional heat and cool unit. The energy saver option maintains your set temperature efficiently, and the 24 hour timer lets you schedule both cooling and heating.
Controls and Comfort
The digital control panel and remote handle the mode, temperature, fan speed and timer. Four-way air deflection lets you send cool air across the room in summer and point warm air downward in heat mode, where it does the most good. Auto restart returns the unit to its previous settings after a power outage, and the check filter alert reminds you to rinse the washable filter.
Choosing the Right LG Heat Model
LG sells larger heat and cool wall units on the same chassis and controls. Choose the LT1033HNR for bedrooms and offices up to 450 square feet, where its lower listed sound level is an advantage. For a medium living room, step up to one of LG’s larger heat models. All of them need a 230 volt outlet, so the decision comes down to room size.
Using Heat Mode Well
Aim the louvers downward in heat mode, since warm air rises and otherwise collects near the ceiling. Set the fan to its higher speed on a cold morning to mix the air quickly, then drop it once the room is comfortable. Closing the door to the room also helps a supplemental heater keep up.
Who It Suits Best
The LT1033HNR suits bedrooms, offices and small living rooms up to 450 square feet with a 230 volt sleeve outlet, in homes that want cooling and supplemental heat from one unit. It is less suited to homes with only standard outlets, large rooms, smart home users, or cold climates that need a primary heat source.
Pros and Cons
| Pros | Cons |
|---|---|
| Cooling and supplemental heat | Needs a 230V outlet |
| 54 dB listed sound level | Heat is supplemental only |
| Fits LG’s 24 inch chassis sleeves | Only 2 fan speeds |
| Trim kit and filter included | Sleeve sold separately |
| Auto restart and 24 hour timer | No Wi-Fi |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Bedrooms and offices up to 450 sq ft | Homes with only standard outlets |
| Apartments with 230V sleeve outlets | Large living rooms |
| Rooms that run cold in spring and fall | Cold climates needing primary heat |
| Replacements for older LG units | Smart home users |
For more options, see our picks for the best 10,000 BTU through-the-wall air conditioners with heat and the best 230V through-the-wall air conditioners with heat.
Final Verdict
The LG LT1033HNR is a quiet, well-rounded heat and cool wall unit for rooms up to 450 square feet. If your sleeve has a 230 volt outlet, it covers summer cooling and cool-day warmth in a single LG-quality package. You can check the current price and details for the LG LT1033HNR 10,000 BTU Through the Wall Air Conditioner with Heat.
Frequently Asked Questions
Does the LG LT1033HNR have heat?
Yes. It has a supplemental heat option for cooler days.
What size room does it cool?
LG rates it for rooms up to 450 square feet.
What voltage does it need?
It runs on 230 volts, so it needs a matching receptacle.
How loud is it?
LG lists 54 dB.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.