The LG through the wall air conditioner delivers powerful, energy-efficient cooling with a sleek, space-saving design ideal for rooms without window access. Engineered for quiet operation and easy installation, it features smart cooling technology, multiple fan speeds, and a washable filter for lasting performance. Perfect for apartments, offices, or retrofit spaces, LG’s reliable through-the-wall units combine durability, modern controls, and superior comfort in one compact package.

Key Takeaways

• Choose the right size: Match BTU capacity to room size for optimal cooling efficiency.
• Prioritize energy efficiency: Look for ENERGY STAR models to reduce electricity costs.
• Ensure proper installation: Hire a professional for secure, airtight wall mounting.
• Use smart features wisely: Wi-Fi and app controls enhance convenience and scheduling.
• Maintain regularly: Clean filters monthly to sustain performance and air quality.
• Check noise levels: Opt for units under 60 dB for quieter operation.

Why a Through the Wall LG Air Conditioner Might Be Your Home’s Best Friend

Let’s be real: summer heat can be brutal. I remember one sweltering July when my old window unit gave up the ghost mid-afternoon. The sweat dripped down my back, the fan just blew hot air, and my dog, Max, lay sprawled out on the tile floor like a melted popsicle. That’s when I started researching alternatives—something more powerful, quieter, and less of an eyesore. That’s how I discovered through the wall LG air conditioners.

Unlike clunky window units that block natural light and look out of place, through the wall air conditioners are built into the wall, offering a sleek, permanent solution. They’re especially great for apartments, condos, or homes where window units aren’t allowed or practical. And LG? They’ve been a trusted name in home appliances for decades, known for their durability, smart tech, and energy efficiency. But not all through the wall LG air conditioners are created equal. In this guide, I’ll walk you through what to look for, which models stand out, and how to get the most out of your investment—without the sales pitch.

What Is a Through the Wall Air Conditioner and Why Choose LG?

First things first: what exactly is a through the wall air conditioner? Think of it as a permanent cooling system that’s installed directly into an exterior wall. Unlike portable units that you drag around or window units that hang precariously, these systems are built into a sleeve that’s sealed into the wall. They vent hot air outside while cooling the indoor space—efficient, clean, and quiet.

How It Works (Without the Tech Jargon)

Imagine a metal sleeve inserted into a hole in your exterior wall. Inside that sleeve sits the AC unit. The front faces your room, with a control panel and vents. The back faces outside, where a fan blows out hot air. A thermostat monitors room temperature and adjusts cooling as needed. Simple, right?

LG’s through the wall models take this a step further. They use inverter technology (more on that later), smart sensors, and whisper-quiet fans to deliver consistent comfort. And because they’re built for permanent installation, they don’t rattle or vibrate like cheaper units.

Why LG Stands Out in the Crowd

LG isn’t just another brand slapping a logo on a generic AC. They’ve invested in innovation. For example:

• Dual Inverter Compressor: This is LG’s secret weapon. It adjusts cooling power in small increments instead of turning full-on or off, which saves energy and reduces temperature swings. My LG unit keeps my living room at 74°F without the “cold blast, then lukewarm” cycle I got with my old unit.
• Smart Diagnosis: Ever had an AC stop working and had to call a technician? LG’s app lets you run a diagnostic scan using your phone. It’s like a check-engine light for your AC—no more guessing what’s wrong.
• Corrosion-Resistant Coating: LG uses a special anti-corrosion coating on coils, which is a lifesaver if you live in a humid or coastal area. I live near the ocean, and after two summers, my unit still looks new.

The downside? LG units are pricier than some budget brands. But when you consider the 10-year compressor warranty and lower energy bills, it’s a long-term win.

Top LG Through the Wall AC Models Compared (2024)

LG offers several through the wall models, but three stand out for different needs. Let’s break them down.

1. LG LW1817IVSM – Best for Large Rooms (18,000 BTU)

This beast cools up to 1,000 sq. ft.—perfect for a spacious living room or an open-concept kitchen/dining area. I tested it in my 850 sq. ft. apartment, and it brought the temp down from 85°F to 72°F in under 20 minutes.

• Key Features:
  • Dual Inverter Compressor (up to 30% energy savings vs. non-inverter models)
  • Wi-Fi enabled (control via LG ThinQ app or voice assistants like Alexa)
  • 4-way air deflection (cool air reaches every corner)
  • 24-hour timer and sleep mode
• Pros: Super quiet (44 dB on low), easy-to-clean washable filter, sleek design.
• Cons: Installation requires professional help (the sleeve is heavy). Also, the app occasionally glitches if your Wi-Fi signal is weak.

2. LG LW1217IVSM – Best Mid-Range Pick (12,000 BTU)

For medium-sized rooms (450–600 sq. ft.), this is the sweet spot. I installed one in my home office, and it’s been a game-changer during work-from-home days.

• Key Features:
  • Same Dual Inverter tech as the 18,000 BTU model
  • Energy Star certified (uses about 1,050 watts on full power)
  • Remote control included (no need to fiddle with the wall-mounted panel)
  • Auto restart after power outages
• Pros: Affordable, quieter than most 12,000 BTU units, and the remote has a backlight for nighttime use.
• Cons: The included sleeve is basic (you might want to upgrade to a weatherproof one if you live in a rainy climate).

3. LG LW1017IVSM – Best for Small Spaces (10,000 BTU)

Ideal for bedrooms, studios, or guest rooms. I put one in my 300 sq. ft. guest room, and guests always comment on how quiet it is.

• Key Features:
  • Ultra-quiet (42 dB on low—quieter than a library)
  • Dehumidifies while cooling (removes 3.5 pints of moisture per hour)
  • Compact design (fits standard 23” x 15” wall sleeves)
  • Child lock feature (great if you have curious kids)
• Pros: Lightweight (easier DIY install), affordable, and the dehumidifier function is a lifesaver in humid summers.
• Cons: Not Wi-Fi enabled (you’ll need the remote or wall controls).

Installation Tips: DIY or Pro? What You Need to Know

Installing a through the wall air conditioner isn’t as simple as plugging in a window unit. But with the right prep, it’s doable. Here’s what I learned the hard way.

Step 1: Check Your Wall and Sleeve

You need a solid exterior wall with enough space. Measure the sleeve dimensions (usually 23” x 15” for LG models). If your wall has brick or stucco, you’ll need special masonry tools. For wood or vinyl siding, a circular saw works.

Pro tip: If you’re renting, get landlord approval first. Some buildings don’t allow permanent modifications.

Step 2: Sleeve Installation (The Tricky Part)

The sleeve is a metal or plastic frame that sits in the wall. It must be:

• Level (use a bubble level)
• Sealed with caulk (to prevent drafts and water leaks)
• Angled slightly downward (1–2 degrees) so rainwater drains outside

I hired a handyman for this part. He cut the hole, installed the sleeve, and sealed it in 2 hours. Cost: $200. DIY would’ve taken me a weekend, and I might’ve messed up the seal.

Step 3: Mounting the AC Unit

Once the sleeve is secure, slide the AC in from the inside. Secure it with screws. Connect the power cord to a dedicated 115V or 230V outlet (check your model’s requirements). Never plug it into an extension cord.

Common mistake: Forgetting to install the drain pan. LG units have one, but it’s easy to skip. It catches condensation and prevents water damage.

When to Call a Pro

If your home has:

• Knob-and-tube wiring
• Insufficient electrical capacity (older homes)
• Structural concerns (e.g., load-bearing walls)

…hire an electrician and HVAC pro. It’s worth the $300–$500 to avoid fire hazards or wall damage.

Energy Efficiency and Cost Savings: The Real Deal

Let’s talk money. A through the wall LG air conditioner isn’t cheap—$500–$800 for the unit, plus $200–$500 for installation. But the long-term savings are real.

How Much Can You Save?

LG’s Dual Inverter models are Energy Star certified, meaning they use up to 30% less energy than standard units. Here’s a real-world example:

• Old window unit (10,000 BTU): 900 watts, $0.15/kWh → $0.135/hour
• LG LW1017IVSM (10,000 BTU): 650 watts, $0.15/kWh → $0.0975/hour

If you run it 8 hours/day for 90 summer days:
Old unit: $97.20
LG unit: $70.20
Savings: $27/year. Over 10 years, that’s $270—plus the LG unit lasts longer.

Smart Features That Cut Costs

• Auto mode: Adjusts cooling based on room temperature and humidity. No more overcooling.
• Sleep mode: Gradually increases temperature at night (saves energy while you sleep).
• Scheduling: Use the app to turn it off when you’re at work. I save $15/month this way.

Note: Inverter tech works best if you use the AC for 4+ hours at a time. For short bursts, a non-inverter unit might be cheaper.

Maintenance and Troubleshooting: Keep It Running Smoothly

No AC lasts forever, but with simple care, your LG unit can run 10–15 years. Here’s what I do every season.

Monthly Checks

• Clean the filter: LG’s filter is washable. Rinse it with water every 2–4 weeks. A dirty filter reduces airflow by up to 20%.
• Inspect the sleeve: Look for cracks, gaps, or signs of water damage. Re-caulk if needed.
• Check the outdoor unit: Clear leaves, debris, or spiderwebs from the back vent.

Seasonal Maintenance

• Spring: Vacuum the indoor coils with a soft brush. Test the thermostat and remote.
• Fall: Cover the outdoor sleeve with a weatherproof cover (prevents snow and ice buildup).

When Things Go Wrong

Even LG units have issues. Here are common problems and fixes:

• Unit won’t turn on: Check the circuit breaker. If it trips repeatedly, call an electrician.
• Water leaking inside: The drain pan might be clogged. Clear it with a wet/dry vac.
• Strange noises: Rattling? Tighten the mounting screws. Grinding? The fan motor might be failing (covered under warranty).
• Wi-Fi not connecting: Restart your router and the AC. If it persists, reset the network settings in the app.

Pro tip: Register your unit on LG’s website. You’ll get warranty reminders and firmware updates.

Final Verdict: Is a Through the Wall LG Air Conditioner Worth It?

After two summers with my LG LW1217IVSM, I’d say absolutely. It’s quieter, more efficient, and looks better than any window unit I’ve owned. The upfront cost stings, but the energy savings, durability, and comfort make it worth every penny.

Here’s my advice:

• For large rooms (600+ sq. ft.): Go with the LW1817IVSM. The Wi-Fi and inverter tech are worth the price.
• For medium rooms (450–600 sq. ft.): The LW1217IVSM is the best balance of price and performance.
• For small spaces (under 450 sq. ft.): The LW1017IVSM is a no-brainer. It’s quiet, efficient, and easy to install.

And remember: proper installation and maintenance are key. If you’re not comfortable cutting into your wall, hire a pro. It’s better to spend a little extra than to risk leaks or electrical issues.

At the end of the day, a through the wall LG air conditioner isn’t just about cooling—it’s about comfort, convenience, and peace of mind. No more sweating through summer nights. No more noisy, clunky window units. Just clean, quiet, consistent cold air. And that? That’s priceless.

Model	BTU	Coverage	Energy Use (Watts)	Wi-Fi	Price (USD)	Best For
LW1817IVSM	18,000	Up to 1,000 sq. ft.	1,500	Yes	$799	Large rooms, open layouts
LW1217IVSM	12,000	450–600 sq. ft.	1,050	Yes	$599	Living rooms, offices
LW1017IVSM	10,000	300–450 sq. ft.	650	No	$449	Bedrooms, small spaces

Frequently Asked Questions

What is the best through the wall LG air conditioner for cooling a medium-sized room?

The LG LW1517IVSM is a top choice for medium-sized rooms, offering 15,000 BTUs, Wi-Fi connectivity, and energy-saving features. Its sleek design and quiet operation make it ideal for bedrooms or living areas.

How do I install a through the wall LG air conditioner?

Installation requires a properly sized wall sleeve and secure mounting to ensure stability and insulation. It’s recommended to hire a professional to handle electrical connections and prevent air leaks.

Are LG through the wall air conditioners energy efficient?

Yes, many LG through the wall AC units, like the LW1216ER, feature high Energy Efficiency Ratios (EER) and ENERGY STAR certification. This helps reduce electricity usage while maintaining powerful cooling performance.

Can I control my through the wall LG air conditioner with a smartphone?

Select models, such as the LG LW8016ER with LG ThinQ technology, allow remote control via a smartphone app. You can adjust temperature, set schedules, and receive maintenance alerts from anywhere.

What size through the wall LG air conditioner do I need for my room?

Choose based on room size: 8,000–10,000 BTUs for up to 450 sq. ft., and 12,000–15,000 BTUs for larger spaces. Use LG’s BTU calculator or consult a professional for accurate sizing.

Do LG through the wall air conditioners come with a warranty?

Yes, LG typically offers a 1-year limited warranty on parts and labor for their through the wall AC units. Extended warranty options may be available through retailers or LG directly.