How to Set Lg Air Conditioner to Logitech Harmony 720

This guide walks you through connecting your LG air conditioner to the Logitech Harmony 720 remote in 2026. You’ll learn how to add the device, sync commands, and troubleshoot common issues—all with clear, easy-to-follow steps.

Key Takeaways

Compatibility Check: Ensure your LG air conditioner model supports IR control and is compatible with Harmony remotes.

Harmony App Setup: Use the Logitech Harmony mobile app (iOS/Android) to add and configure your LG AC.
Device Discovery: Let the app search for your LG AC model automatically or enter the model number manually.
IR Learning (Optional): If auto-setup fails, use IR learning to teach the remote your AC’s original remote signals.

Activity Creation: Create a “Cool the Room” activity to control multiple devices with one button press.
Firmware Updates: Keep your Harmony 720 and LG AC firmware updated for optimal performance in 2026.
Troubleshooting Tips: Fix connection issues by checking line of sight, battery levels, and signal interference.

How to Set LG Air Conditioner to Logitech Harmony 720 in 2026

Welcome to your complete, up-to-date guide for connecting your LG air conditioner to the Logitech Harmony 720 remote in 2026. Whether you're tired of juggling multiple remotes or just want a smarter way to control your home climate, this step-by-step tutorial will help you integrate your LG AC seamlessly into your Harmony ecosystem.

By the end of this guide, you’ll know exactly how to add your LG air conditioner to the Harmony 720, customize commands, create activities, and troubleshoot any hiccups along the way. We’ve designed this guide with simplicity in mind—no technical jargon, just clear, friendly instructions you can follow in under 20 minutes.

Let’s get started!

Why Connect Your LG AC to the Harmony 720?

Visual guide showing LG AC paired with Harmony 720 remote

Image source: buttonworx.com

In 2026, smart home integration is more important than ever. The Logitech Harmony 720 remains a popular choice for centralized control, thanks to its reliable infrared (IR) technology, intuitive app, and support for thousands of devices.

By linking your LG air conditioner to the Harmony 720, you gain:

One Remote for Everything: Control your TV, soundbar, streaming device, and AC all from one place.
Custom Activities: Press one button to “Start Movie Night” and have the lights dim, the TV turn on, and the AC cool the room to 72°F.
Convenience: No more searching for the AC remote behind the couch—your Harmony 720 handles it all.

Energy Efficiency: Set timers and schedules to cool your home only when needed, saving on energy bills.

Even though newer smart ACs offer Wi-Fi and app control, many LG models still rely on IR remotes—making the Harmony 720 a perfect match.

What You’ll Need

Before we begin, make sure you have the following:

Logitech Harmony 720 Remote: Fully charged or connected to power.
LG Air Conditioner: Must use an infrared (IR) remote (most window and split units do).
Original LG AC Remote: Needed for IR learning (if auto-setup fails).
Smartphone or Tablet: With the Logitech Harmony app installed (available on iOS and Android).
Wi-Fi Connection: Required for initial setup and firmware updates.
Harmony Account: Free account at myharmony.com or via the app.

Note: The Harmony 720 does not support Wi-Fi or Bluetooth control—it uses IR signals only. So your LG AC must have an IR receiver (usually a small dark window on the unit).

Step 1: Install the Harmony App and Log In

The Harmony 720 is configured entirely through the Logitech Harmony mobile app. Here’s how to get started:

Download the App

Go to the Apple App Store (iOS) or Google Play Store (Android) and search for “Logitech Harmony.” Download and install the official app. As of 2026, the app is still fully supported and receives regular updates.

Create or Log In to Your Account

Open the app and sign in with your existing Logitech account. If you don’t have one, tap “Create Account” and follow the prompts. You’ll need a valid email address.

Connect to Your Harmony 720

Turn on your Harmony 720 remote by pressing any button. The app will prompt you to connect. Make sure your phone and remote are on the same Wi-Fi network.

Tap “Add Remote” and follow the on-screen instructions. The app will search for your Harmony 720. Once found, it will sync and prepare for device setup.

Tip: If the app doesn’t find your remote, try restarting both the app and the remote. Also, ensure your phone’s Bluetooth is on—it helps with initial pairing.

Step 2: Add Your LG Air Conditioner

Now it’s time to add your LG air conditioner to the remote.

Tap “Add Device”

In the Harmony app, go to the main menu and select “Devices.” Then tap the “+” icon or “Add Device.”

Select Device Type

Choose “Air Conditioner” from the list of device categories.

Choose Brand: LG

Scroll through the brand list and select “LG.” The app will now search its database for compatible LG AC models.

Enter Your Model Number (Optional but Recommended)

For best results, enter your LG air conditioner’s model number. You can find this on the unit’s label (usually on the side or back) or in the user manual.

For example:

LG LW1222IVSM (Window Unit)
LG Dual Inverter Smart Window AC (Model: LW1822IVSM)

LG Split AC (Model: LS120HSV5)

If you don’t know the model, the app may still find a match by scanning its database.

Let the App Auto-Configure

The Harmony app will attempt to load the correct IR command set for your LG AC. This usually takes 10–15 seconds.

If successful, you’ll see a confirmation screen with basic commands like Power, Mode (Cool/Heat/Fan), Temperature Up/Down, and Fan Speed.

Pro Tip: If the app says “No matching device found,” don’t worry—we’ll cover manual setup in the next section.

Step 3: Test the Basic Commands

Before moving forward, test the remote to make sure it’s working.

Point the Remote at the AC

Aim the Harmony 720 directly at your LG air conditioner’s IR receiver (usually on the front panel).

Press the Power Button

Tap the “Power” button in the app or on the remote. Your AC should turn on or off.

Try Other Functions

Test:

Changing modes (Cool → Fan → Dry)
Adjusting temperature (up/down)
Changing fan speed

If all commands work, great! You’re almost done.

If not, proceed to the troubleshooting section or try IR learning (covered below).

Step 4: Use IR Learning (If Auto-Setup Fails)

Sometimes, the Harmony app doesn’t have the exact command set for your LG model—especially for older or region-specific units. In that case, use IR learning to “teach” the remote your AC’s original signals.

Prepare the Original Remote

Grab your LG air conditioner’s original remote. Make sure it has working batteries.

Open IR Learning in the App

In the Harmony app, go to:

Devices → Select Your LG AC → Edit → Advanced Settings → IR Learning

Select a Command to Learn

Choose a command like “Power” or “Mode.” The app will prompt you to press the corresponding button on the original remote.

Align the Remotes

Place the original LG remote about 2–3 inches in front of the Harmony 720’s IR receiver (located at the top of the remote).

Press and Hold

Press and hold the button on the original remote until the Harmony app confirms it has learned the signal (usually a beep or checkmark).

Repeat for All Commands

Repeat this process for:

Power
Mode (Cool, Heat, Fan, Dry)
Temperature Up/Down
Fan Speed
Timer On/Off

Tip: Label each command clearly in the app so you don’t get confused later.

Test Again

Once all commands are learned, test the remote again. It should now work perfectly.

Step 5: Create a Custom Activity (Optional but Recommended)

Activities let you control multiple devices with one button. For example, “Cool Down” could turn on the AC, lower the blinds, and dim the lights.

Go to Activities in the App

Tap “Activities” in the main menu, then “+ Add Activity.”

Choose “Custom Activity”

Select “Create Your Own” and give it a name like “Cool the Room” or “Movie Night.”

Add Devices

Include your LG air conditioner and any other devices (e.g., TV, lights).

Set Commands

For the AC, set:

Power: On
Mode: Cool
Temperature: 72°F
Fan Speed: Medium

You can also add delays (e.g., wait 5 seconds before turning on the TV).

Save and Test

Save the activity and press the “Start” button on your Harmony 720. Watch as your AC turns on and cools the room automatically.

Bonus: Use the “End Activity” command to turn everything off at once.

Step 6: Update Firmware (Important for 2026)

Logitech continues to support the Harmony 720 with firmware updates. These improve compatibility and fix bugs.

Check for Updates

In the Harmony app, go to:

Menu → Settings → Remote Settings → Check for Updates

If an update is available, follow the prompts to install it. The remote will restart automatically.

Update Your LG AC (If Applicable)

Some newer LG models support firmware updates via Wi-Fi. Check the LG ThinQ app or your AC’s display for update notifications.

Keeping both devices updated ensures smooth operation in 2026 and beyond. For the latest Harmony firmware details, see the official Logitech support page.

Troubleshooting Common Issues

Even with perfect setup, you might run into problems. Here’s how to fix the most common ones.

Remote Not Responding

Check Batteries: Weak batteries reduce IR range. Replace them if needed.
Line of Sight: The Harmony 720 needs a clear path to the AC’s IR receiver. Move obstacles or reposition the remote.

Distance: Stay within 20–30 feet of the AC.

Wrong Commands Sent

Re-learn IR Signals: If buttons do the wrong thing, go back to IR learning and re-teach the correct commands.
Check Device Type: Make sure you selected “Air Conditioner” and not “Fan” or “Heater.”

App Can’t Find the Remote

Restart Both Devices: Turn off the remote, close the app, then restart.

Reconnect to Wi-Fi: Ensure your phone and remote are on the same network.
Reset the Remote: Hold the “Off” and “Menu” buttons for 10 seconds to reset.

AC Turns On But Doesn’t Cool

Check Mode: Make sure the remote is set to “Cool” and not “Fan” or “Dry.”

Temperature Setting: Ensure the set temperature is lower than the room temperature.
AC Filter: A dirty filter can reduce cooling. Clean it monthly.

IR Learning Fails

Use Fresh Batteries: Weak batteries on the original remote can cause weak signals.
Clean IR Lenses: Dust on the remote lenses can block signals. Wipe with a soft cloth.

Try in Dim Light: Bright sunlight or LEDs can interfere with IR signals. Learn commands in a darker room.

Tips for Best Performance in 2026

Use a Harmony Hub (Optional): If you have multiple IR devices in different rooms, consider adding a Harmony Hub for whole-home control.
Label Your Buttons: In the app, rename buttons like “Cool 72°F” for quick access.

Set Schedules: Use the app to schedule your AC to turn on 30 minutes before you get home.
Keep Remotes Clean: Dust and grime can block IR signals. Clean regularly.
Backup Your Setup: The Harmony app automatically saves your configuration to the cloud. But you can also export it as a file.

Choosing the Right LG Model for Harmony Integration

When selecting a compatible unit, consider the IR capabilities and model numbering. Some LG series use proprietary codes that require manual IR learning, while others are fully supported in the Harmony database. Reviewing the specifications before purchase can save setup time. For more guidance on picking a unit that fits your smart‑home plan, see our advice on selecting a compatible unit.

Energy‑Efficient Settings for Your LG AC

Running the AC at the optimal temperature and fan settings reduces wear on the IR receiver and lowers electricity use. The Harmony app lets you lock in a set‑point and schedule so the unit only runs when needed. For a deeper dive into the most efficient configurations, explore our breakdown of optimal temperature and fan settings.

Maintaining Your LG AC for Reliable IR Control

Regular filter cleaning and coil checks keep airflow strong and the IR sensor unobstructed. A clogged filter can cause the unit to cycle more often, increasing the chance of missed commands. Seasonal upkeep also extends the lifespan of the remote’s IR emitter. Learn a simple maintenance routine in our regular filter cleaning and coil checks guide.

Comparing IR vs Wi‑Fi Control for LG Units

Understanding the differences between IR and networked control helps you decide whether to stick with the Harmony 720 or move to a Wi‑Fi‑enabled hub. IR requires line‑of‑sight but works with virtually any legacy LG model, while Wi‑Fi offers app‑based scheduling and voice‑assistant integration. For a side‑by‑side look at the trade‑offs, read our comparison of differences between IR and networked control.

Troubleshooting AC Cooling Issues

If the AC powers on but the room stays warm, the problem may be unrelated to the remote. Common cooling problems include low refrigerant, blocked vents, or a faulty compressor. The Harmony remote can only send commands—it cannot fix mechanical faults. For a step‑by‑step diagnostic, refer to our article on common cooling problems.

Conclusion

Setting up your LG air conditioner with the Logitech Harmony 720 in 2026 is easier than you think. With the Harmony app, you can add your AC in minutes—either through automatic detection or IR learning. Once connected, you’ll enjoy the convenience of controlling your climate from one remote, plus the power of custom activities that simplify your daily routine.

Remember to test each command, keep your firmware updated, and troubleshoot with patience. Whether you’re cooling down on a hot summer day or creating the perfect movie night atmosphere, your Harmony 720 and LG AC will work together seamlessly.

Now go enjoy that cool, comfortable air—with just the press of a button!

Want more ways to streamline your home climate? Check out our guide on picking the ideal air conditioner for your space.

Frequently Asked Questions

Can I use the Harmony 720 with an LG AC that only has Wi‑Fi control?

No. The Harmony 720 communicates solely via infrared, so the air conditioner must have an IR receiver. Wi‑Fi‑only models require a Harmony Hub or a different smart‑home bridge.

How do I find the model number if the label is worn off?

Check the original user manual, the LG ThinQ app (if the unit is registered), or the invoice from the retailer. The model is usually a combination like “LW1222IVSM”.

Why does the Harmony app say “No matching device found” for my LG AC?

The database may not contain newer or region‑specific models. In that case, use the IR learning feature to teach each command manually.

Can I schedule the AC to turn on before I arrive home?

Yes. After creating an activity, open the Harmony app’s scheduling section and set a start time. The remote will send the IR command at the chosen time.

Does the Harmony 720 support voice assistants like Alexa or Google Assistant?

The remote itself does not, but pairing it with a Harmony Hub enables voice control through Alexa, Google Assistant, or Siri shortcuts.