LG through wall air conditioners deliver powerful, energy-efficient cooling ideal for spaces where traditional window units fall short. With sleek designs, quiet operation, and smart features like Wi-Fi control and programmable timers, LG’s 2024 lineup offers top-tier performance across various BTU capacities to match any room size. Trusted for durability and backed by strong customer support, LG stands out as a leading choice for permanent, high-efficiency climate control.

Key Takeaways

• Top Efficiency: LG units offer Energy Star ratings for lower energy bills.
• Quiet Operation: Advanced tech ensures minimal noise for peaceful environments.
• Easy Installation: Designed for quick setup in standard through-wall openings.
• Smart Features: Wi-Fi enabled models allow remote control via mobile app.
• Durability: Corrosion-resistant materials ensure long-term reliability in harsh conditions.
• Custom Cooling: Multiple fan speeds and modes for personalized comfort year-round.

Why Through Wall Air Conditioners Are a Smart Choice in 2024

Let’s be honest—summer heat can be brutal. Whether you’re in a city apartment with no central AC or a home that just doesn’t cool evenly, finding a reliable, efficient way to beat the heat is a top priority. That’s where LG through wall air conditioner units come in. These sleek, permanent cooling solutions are designed to fit snugly into a wall sleeve, offering a cleaner look than traditional window units and often better energy efficiency. Unlike portable ACs that take up floor space and struggle with hot spots, through-the-wall units deliver targeted, consistent cooling—especially in rooms that are hard to cool.

I remember helping my sister install a through-wall AC in her third-floor bedroom last summer. Her old window unit rattled like a washing machine and barely cooled the room. After swapping it for an LG model, the difference was night and day. The room cooled faster, the noise dropped significantly, and she even noticed lower electricity bills. That personal experience made me realize just how much a quality through-wall unit can transform comfort. In this review, I’ll walk you through everything you need to know about LG through wall air conditioner models in 2024—what makes them stand out, which models are worth your money, and how to pick the right one for your space.

What Makes LG Through Wall Air Conditioners Stand Out?

LG has built a strong reputation in the HVAC world, and their through-wall AC lineup is no exception. But what exactly sets them apart from the competition? Let’s break down the key features that make LG a top contender in 2024.

1. Energy Efficiency That Pays Off

One of the biggest selling points of LG through-wall units is their high Energy Efficiency Ratio (EER). Many models, especially those with inverter technology, boast EER ratings above 11—some even reach 12.5. That means they use less electricity to produce the same cooling power. For example, the LG LW1817IVSM uses inverter-driven compressors that adjust output based on room temperature, avoiding the constant on-off cycling of traditional units. This not only saves energy but also reduces wear and tear, extending the unit’s lifespan.

Real-world example: A friend in Phoenix runs her LG unit 8 hours a day during summer. She estimates it costs her about $0.45 per day to run—less than half what her old window unit used to cost.

2. Whisper-Quiet Operation

Noise is a dealbreaker for many, especially in bedrooms or home offices. LG tackles this with advanced sound-dampening materials and variable-speed fans. Their “Sleep Mode” reduces fan speed and compressor noise to as low as 42 dB—about the sound of a quiet library. I tested this in a small bedroom and barely noticed the unit was on after 10 minutes.

Tip: If noise is a concern, look for models with “Quiet Mode” or “Low Noise Operation” in the specs. These are ideal for light sleepers or shared living spaces.

3. Smart Features That Simplify Life

LG integrates smart tech into many of their through-wall units. The LG ThinQ app lets you control the AC from your phone, set schedules, and even monitor energy usage. You can turn it on before you get home or adjust the temperature while lying in bed. Some models also support Google Assistant and Alexa, so you can use voice commands—“Hey Google, set the AC to 72°F.”

Bonus: The app sends maintenance alerts, like when to clean the filter or if airflow is restricted. That’s a small feature, but it helps prevent bigger issues down the line.

4. Durability and Build Quality

LG uses corrosion-resistant materials in coastal areas and reinforced chassis to handle vibrations. Their units are built to last 10–15 years with proper maintenance. I’ve seen older LG models (from 2017) still running strong in rental properties with minimal upkeep.

One thing to note: While LG’s build quality is solid, the plastic front panels can scratch easily. Consider using a protective cover if you have pets or kids.

Top 3 LG Through Wall Air Conditioner Models for 2024

Choosing the right model depends on your room size, budget, and feature preferences. Here are the top three LG through-wall ACs in 2024, based on performance, user feedback, and value.

1. LG LW1817IVSM (18,000 BTU) – Best Overall

• BTU: 18,000 (covers 1,000–1,200 sq. ft.)
• EER: 12.1 (Energy Star certified)
• Features: Inverter compressor, Wi-Fi, 4 fan speeds, 24-hour timer, washable filter
• Noise Level: 50 dB (normal), 42 dB (sleep mode)
• Price Range: $650–$750

This is LG’s flagship through-wall model. The inverter technology makes it super efficient, and the app control is seamless. It’s perfect for large living rooms or open-concept spaces. One reviewer mentioned it cooled their 1,100 sq. ft. loft in under 30 minutes on a 95°F day. The only downside? It’s on the pricier side, but the long-term energy savings justify the cost.

Pro tip: Use the “Auto Clean” function weekly to prevent mold and keep airflow optimal.

2. LG LW1217IVSM (12,000 BTU) – Best for Medium Rooms

• BTU: 12,000 (covers 550–700 sq. ft.)
• EER: 12.2
• Features: Inverter, Wi-Fi, 3 fan speeds, 8-way air deflection, remote control
• Noise Level: 49 dB (normal), 41 dB (sleep mode)
• Price Range: $500–$600

If you’re cooling a bedroom, home office, or small apartment, this 12,000 BTU unit is a sweet spot. It’s quieter than the 18,000 BTU model and slightly more energy-efficient. The 8-way air deflection ensures even cooling—no more hot spots in the corners. A user in a 650 sq. ft. studio said it kept their entire space at 70°F without running constantly.

Note: The Wi-Fi setup can be finicky. Make sure your phone is close to the unit during pairing.

3. LG LW1016ER (10,000 BTU) – Budget-Friendly Pick

• BTU: 10,000 (covers 450–550 sq. ft.)
• EER: 10.8
• Features: 3 cooling speeds, 24-hour timer, remote control, washable filter
• Noise Level: 52 dB (normal), 45 dB (sleep mode)
• Price Range: $350–$450

This model lacks inverter tech and Wi-Fi, but it’s a solid choice if you’re on a tight budget. It’s reliable, easy to install, and great for smaller rooms. A college student in a 500 sq. ft. dorm said it kept their space cool during a heatwave with no issues. The noise is noticeable but not disruptive.

Downside: It uses more energy than inverter models. Expect about 10–15% higher electricity costs compared to the IVSM series.

Installation Tips: Getting It Right the First Time

Installing a through-wall AC isn’t as simple as a window unit. A poor install can lead to leaks, drafts, or even structural damage. Here’s how to do it right—based on my experience and pro installer advice.

1. Check Your Wall Type and Sleeve

Through-wall units require a dedicated sleeve (usually 24” x 14” x 16”) installed in the wall. If you’re retrofitting, make sure your wall is thick enough (at least 5–6 inches) and free of electrical wires or plumbing. Brick, concrete, and wood-frame walls work best. Avoid installing in load-bearing walls without consulting a contractor.

Tip: If your home already has a sleeve from a previous AC, measure it before buying. LG sleeves are standardized, but older models may need an adapter.

2. Seal the Gaps (Critical!)

Even a 1/8-inch gap around the unit can cause air leaks and reduce efficiency. Use expanding foam sealant (not regular caulk) to fill gaps between the sleeve and wall. For exterior gaps, apply weather-resistant caulk to prevent water intrusion.

Pro tip: After sealing, run the AC for 24 hours and check for drafts with a tissue. If it moves, you’ve got a leak.

3. Level the Unit

Most LG units have a slight tilt (about 1/4 inch) to the outside to allow condensation to drain. Use a level during installation to get this right. If the unit tilts inward, water can pool and cause mold or damage.

Real-world fail: A friend installed their AC without checking the tilt. A month later, they noticed a musty smell—condensation had pooled inside and started mold growth. A quick re-leveling fixed it, but it was a hassle.

4. Electrical Requirements

LG through-wall units typically need a dedicated 115V or 230V circuit (check the manual). The 18,000 BTU models usually require 230V, which may need a new circuit. If you’re not comfortable with electrical work, hire an electrician. Never use extension cords or power strips—they can overheat and start fires.

Energy Efficiency and Cost Savings: What to Expect

Let’s talk money. How much can you really save with an LG through wall air conditioner? It depends on your usage, local electricity rates, and model efficiency.

1. EER vs. SEER: What’s the Difference?

EER (Energy Efficiency Ratio) measures efficiency at a single temperature (95°F), while SEER (Seasonal Energy Efficiency Ratio) accounts for varying temperatures over a season. LG through-wall units are rated by EER, not SEER, because they’re room-specific. A high EER (11+) means lower energy use during peak heat.

Example: The LW1817IVSM (EER 12.1) uses about 1.5 kWh per hour, while a standard 18,000 BTU window unit (EER 9.5) uses 1.9 kWh. Over 100 hours of use, that’s a 26% savings.

2. Real-World Cost Breakdown

Let’s assume:

• Electricity rate: $0.15/kWh
• Usage: 8 hours/day for 90 days (summer)
• Total runtime: 720 hours

Here’s a comparison of three LG models:

Model	BTU	EER	Avg. Hourly Cost	Total Summer Cost
LW1817IVSM	18,000	12.1	$0.18	$130
LW1217IVSM	12,000	12.2	$0.12	$86
LW1016ER	10,000	10.8	$0.14	$100

Note: The LW1016ER costs more than the LW1217IVSM in this example because it runs longer to cool the same space. Inverter models adjust speed, so they’re more efficient overall.

3. Maintenance for Maximum Efficiency

Dirty filters and coils can reduce efficiency by up to 15%. Here’s what to do:

• Clean the filter monthly (or weekly in dusty areas). Rinse with water and let it dry.
• Vacuum the condenser coils every 3 months. Use a soft brush to avoid bending fins.
• Clear debris from the exterior (leaves, grass) to maintain airflow.

One user saved $20/month just by cleaning their filter regularly. A small effort with big returns!

Common Issues and How to Fix Them (Without a Repairman)

Even the best ACs can have hiccups. Here are the most common issues with LG through-wall units and how to troubleshoot them.

1. Unit Not Cooling Enough

Possible causes:

• Dirty filter or coils (clean them first)
• Incorrect BTU for room size (upgrade if your room is larger than recommended)
• Thermostat set too high (try lowering it by 2–3°F)
• Airflow blocked (move furniture away from vents)

Tip: If the unit runs constantly but never cools, the refrigerant may be low. Call a pro—this requires a licensed technician.

2. Water Leaking Inside

This usually means:

• The unit isn’t tilted outward (re-level it)
• The drain pan is clogged (remove debris)
• Condensation buildup (clean the filter and coils)

Pro fix: Place a small tray under the unit to catch leaks during troubleshooting.

3. Wi-Fi or App Not Connecting

LG’s app can be glitchy. Try:

• Resetting the unit’s Wi-Fi (hold the “Wi-Fi” button for 10 seconds)
• Reinstalling the ThinQ app
• Using a 2.4 GHz network (not 5 GHz)

One reviewer fixed their connection issue by moving their router closer to the unit. Distance matters!

4. Strange Noises

Humming or buzzing? It could be:

• Loose screws (tighten them)
• Fan hitting debris (inspect and clean)
• Compressor issues (rare, but call support if it persists)

Note: A faint “click” when turning on is normal—it’s the thermostat activating.

Final Verdict: Is an LG Through Wall AC Worth It?

After testing and researching LG’s 2024 lineup, I can confidently say: Yes, an LG through wall air conditioner is a smart investment—if you pick the right model for your needs. The LW1817IVSM is the top performer for large spaces, with unmatched efficiency and smart features. The LW1217IVSM is ideal for medium rooms, balancing cost and performance. And if budget is tight, the LW1016ER delivers solid cooling without breaking the bank.

LG’s strengths—energy efficiency, quiet operation, and smart tech—make them stand out in a crowded market. But they’re not perfect. The Wi-Fi setup can be frustrating, and the plastic panels aren’t indestructible. Still, the pros far outweigh the cons. You’re getting a unit built to last, with features that genuinely improve comfort and convenience.

Before you buy, ask yourself:

• How big is your room? Match BTU to square footage.
• Do you want smart controls? Go for an IVSM model.
• Is installation DIY-friendly? If not, budget for a pro installer.
• How much are you willing to spend? The inverter models cost more upfront but save money long-term.

At the end of the day, a through-wall AC is more than a luxury—it’s a tool for better living. Whether you’re escaping a sweltering apartment, cooling a home office, or just enjoying a peaceful night’s sleep, an LG through wall air conditioner can make all the difference. Do your research, install it right, and enjoy a cooler, more comfortable 2024.

Frequently Asked Questions

What is the best LG through wall air conditioner for 2024?

The LG LW1522IVSM (15,000 BTU) and LW1222IVSM (12,000 BTU) are top picks for 2024, offering inverter technology, quiet operation, and Wi-Fi controls. Both models excel in energy efficiency and cooling power for medium to large rooms.

How does an LG through wall AC compare to window units?

LG through wall air conditioners provide a sleeker, more permanent installation than window units, with better sound insulation and a lower profile. They’re ideal for spaces where window mounting isn’t practical or aesthetically preferred.

Are LG through wall air conditioners energy efficient?

Yes, LG’s 2024 through wall models feature ENERGY STAR certification and inverter compressors that adjust cooling output to save energy. Their high CEER ratings (up to 15.0) ensure lower electricity bills over time.

Can I control my LG through wall AC with my phone?

Select LG through wall models include LG ThinQ app support, allowing remote temperature control, scheduling, and voice commands via Alexa or Google Assistant. Look for “Wi-Fi” in the product name for this feature.

What size LG through wall AC do I need for my room?

For a 300–400 sq. ft. room, a 12,000 BTU unit (like the LW1222IVSM) is ideal; for 400–550 sq. ft., choose a 15,000 BTU model. LG’s BTU recommendations account for ceiling height and sunlight exposure.

Do LG through wall air conditioners come with a warranty?

LG typically offers a 1-year parts and labor warranty on through wall ACs, with a 5-year sealed system warranty. Register your unit online to activate coverage and check extended warranty options.