LG LT0816CER Review: 7,800 BTU Through-the-Wall AC
LG's smallest cooling-only wall unit, rated 7,800 BTU for rooms up to 330 sq ft, with an EER of 10.7, a 750 watt draw on 115V and a remote.
By Daniel Brooks
Updated October 22, 2026
The LG LT0816CER is LG’s smallest cooling-only through-the-wall air conditioner. It is rated at 7,800 BTU for rooms up to 330 square feet, runs on a standard 115 volt outlet and draws just 750 watts, which makes it one of the most efficient ways to cool a bedroom or home office through an existing wall sleeve. It is a long-running model in our cooling-only through-the-wall air conditioners category, with a 3.9 out of 5 average from 410 ratings.
LG and Amazon sometimes call it an 8,000 BTU unit. The specifications list 7,800 BTU, and that is the figure we use here.
Our Verdict
The LT0816CER is the right size for a single bedroom, a nursery, a small office or a dorm-style studio. It lists an EER of 10.7, uses R-32 refrigerant and has the same core features as LG’s larger wall units: three cooling and fan speeds, energy saver mode, dry mode, a 24 hour timer, auto restart and a remote.
It is not a unit for a living room or an open-plan space, and it has no Wi-Fi, heat or inverter compressor. The sleeve is sold separately. For a small room with an existing sleeve, though, it is efficient, simple and widely proven.
LG 7,800 BTU Through the Wall Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | LG |
| Model | LT0816CER |
| Type | Cooling-only through-the-wall air conditioner |
| Cooling Capacity | 7,800 BTU |
| Room Size | Up to 330 sq ft |
| Power | 115 volts, 750 watts |
| Efficiency | EER 10.7 (SEER listed as 10.6) |
| Refrigerant | R-32 |
| Noise Level | 56 dB (listed) |
| Dehumidifying | Up to 2.1 pints per hour |
| Dimensions | 24 x 14.4 x 20.1 inches (W x H x D) |
| Weight | 66 pounds |
| Sleeve Width | 24.5 to 27 inches, sold separately |
| Warranty | 1 year parts and labor |
Cooling Capacity and Room Size
LG rates the LT0816CER for rooms up to 330 square feet. In the sizing chart below, that sits between the 7,000 and 8,000 BTU bands, so the rating is a fair match for its 7,800 BTU output. In real terms, that covers a standard bedroom with room to spare, a nursery or a compact office.
If the room is very sunny, sits on a top floor or holds more than two people for long stretches, consider stepping up to a 10,000 BTU class wall unit instead. An undersized wall unit will run constantly on hot afternoons without ever reaching the set point.
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.
Installation and Sleeve Fit
This is a through-the-wall chassis. LG says it is not properly vented for a standard window installation, because the wall would block the side vents a window unit uses. The unit needs a wall sleeve between 24.5 and 27 inches wide, and the sleeve is sold separately.
The chassis is 24 inches wide, 14.4 inches tall and 20.1 inches deep, the same footprint as LG’s larger wall units, so it can replace one of those or an older unit of similar size. At 66 pounds it is lighter than the bigger models, but it is still easier with two people. The box includes a plastic snap-together trim kit, a plastic mesh grille for the outdoor side, insulation foam, a washable filter and the remote.
Energy Use and Efficiency
A draw of 750 watts is low for a wall unit, and the listed EER of 10.7 is strong for a conventional compressor in this size. On a standard bedroom circuit it leaves plenty of headroom for a lamp, a laptop and a phone charger.
Energy saver mode keeps the fan running but stops the compressor once the room reaches your set temperature. The 24 hour timer lets you schedule cooling around your day, and auto restart brings the unit back to its previous settings after a power outage, which is useful if you are away when the power drops.
Noise
LG lists 56 dB, which is typical for a conventional wall unit. For a bedroom, the lowest fan speed and energy saver mode are the quietest combination. The compressor will still click on and off, so if you are very sensitive to that, an inverter window or mini-split system is the quieter type of cooling.
Controls and Features
The digital front panel and remote handle three modes, three speeds and the timer. Dry mode removes up to 2.1 pints of moisture per hour for damp, mild days. Four-way air deflection lets you send air toward the bed or desk, and a filter light reminds you when the washable filter needs a rinse. There is no app, Wi-Fi or voice control.
Replacing an Older Wall Unit
Many buildings still have wall sleeves from an older unit, and the LT0816CER is often bought as a direct swap. Before you order, measure the inside width and height of the existing sleeve and check that it falls in the 24.5 to 27 inch width range LG specifies. Check the rear grille too. Some older sleeves have a grille pattern that restricts airflow for a modern chassis, and a mismatched grille can make any wall unit run hotter and louder than it should.
It also helps to clean the sleeve and seal any gaps around it before sliding the new unit in. The insulation foam in the box fills the space between the chassis and the sleeve, which keeps outdoor air and insects out and helps the unit hold its set temperature.
Who It Suits Best
The LT0816CER is a good fit for bedrooms, nurseries, home offices and small studios with an existing sleeve, and for anyone who wants low running costs on a standard 115 volt outlet. It is less suited to living rooms, rooms with heavy sun, or anyone who wants smart control or winter heat.
Pros and Cons
| Pros | Cons |
|---|---|
| Low 750 watt draw | Only for rooms up to 330 sq ft |
| EER 10.7 with R-32 refrigerant | Wall sleeve sold separately |
| Runs on a standard 115V outlet | No Wi-Fi or app |
| Lighter than larger wall units at 66 pounds | Conventional compressor at 56 dB |
| Energy saver, dry mode and timer | No heat mode |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Bedrooms and nurseries | Living rooms and open spaces |
| Small home offices | Smart home users |
| Renters with an existing sleeve | Rooms that need winter heat |
| Buyers focused on running costs | Very light sleepers |
For more choices, see our picks for the best 115V through-the-wall air conditioners and the budget through-the-wall air conditioners.
Final Verdict
The LG LT0816CER is a small, efficient cooling-only wall unit that does one job well. For rooms up to 330 square feet with a 24.5 to 27 inch sleeve, it is one of the simplest and cheapest wall units to run. Choose a larger model if the room is big or sunny. You can check the current price and details for the LG 7,800 BTU Through the Wall Air Conditioner.
Frequently Asked Questions
What size room does the LG LT0816CER cool?
LG rates it for rooms up to 330 square feet.
What size wall sleeve does it need?
It needs a sleeve between 24.5 and 27 inches wide. The sleeve is sold separately.
How much power does it use?
It draws 750 watts on a standard 115 volt outlet.
Does it heat?
No. The LT0816CER is a cooling-only unit with cool, dry and fan functions.
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.