How to Turn on Heat on Lg Air Conditioner

How to Turn on Heat on Lg Air Conditioner

Turning on the heat mode on your LG air conditioner is simple and efficient when you know the right steps. This guide covers remote control, LG ThinQ app, and manual panel methods for 2026 models, ensuring comfort all winter long.

Key Takeaways

• Use the remote control’s “Mode” button to switch to Heat mode quickly. Most LG AC units come with a remote that allows you to cycle through cooling, heating, fan, and auto modes with ease.

• Ensure your LG air conditioner model supports heating (heat pump models only). Not all LG ACs have heating capability—check your model number or user manual to confirm.

• Set your desired temperature between 68°F and 86°F for optimal comfort and efficiency. Avoid setting it too high, as this can strain the system and increase energy use.

• Use the LG ThinQ app for remote heating control from your smartphone. Available on iOS and Android, the app lets you turn on heat before arriving home or adjust settings remotely.

• Clean filters and check outdoor unit placement for better heating performance. Dirty filters or blocked airflow can reduce heating efficiency and indoor air quality.

• If the unit doesn’t heat, check power, settings, and defrost mode before calling support. Many heating issues are fixable with simple troubleshooting steps.

• Schedule regular maintenance to keep your LG AC running efficiently year-round. Annual servicing helps prevent breakdowns and extends the lifespan of your unit.

How to Turn on Heat on LG Air Conditioner: A Complete 2026 Guide

As temperatures drop in 2026, staying warm at home is a top priority—and your LG air conditioner can be a powerful ally. Many modern LG AC units, especially heat pump models, are designed to provide both cooling and heating, making them versatile year-round climate solutions. Whether you're using a window unit, a ductless mini-split, or a central system with LG components, turning on the heat mode is straightforward once you know how.

In this comprehensive guide, you’ll learn how to activate heating on your LG air conditioner using the remote control, the LG ThinQ smartphone app, and the unit’s physical control panel. We’ll also cover essential tips for optimal performance, troubleshooting common issues, and maintaining your system for long-term efficiency. By the end, you’ll be able to enjoy consistent, comfortable warmth—no matter how cold it gets outside.

Understanding LG Air Conditioner Heating Capabilities

Visual guide showing the heat mode selection on an LG remote control

Image source: storables.com

Before you attempt to turn on the heat, it’s important to confirm that your LG air conditioner actually supports heating. Not all models do. LG offers a range of air conditioners, including window units, portable units, and ductless mini-splits. Only those labeled as “heat pumps” or “with heating function” can provide warmth.

Most LG mini-split systems (like the LG Dual Inverter models) and select window units come with heat pump technology. These systems reverse the refrigeration cycle to extract heat from the outside air—even in cold weather—and transfer it indoors. This makes them highly energy-efficient compared to traditional electric heaters.

To check if your unit supports heating:

• Look for a “Heat” or “Heating” mode on the remote control.
• Check the model number on the unit or in the user manual. Heat pump models often include “HP” (Heat Pump) in the name, such as LG LW1216HR or LG Art Cool Premier 12,000 BTU HP.
• Refer to the LG website or customer support for confirmation.

If your unit doesn’t have heating capability, you’ll need to use a separate space heater or consider upgrading to a heat pump model.

In practice, a common mistake is assuming all mini-splits heat — some LG "cooling only" models look identical to heat pump versions. Always verify the model suffix includes "HP" or check the spec sheet for "Heating Capacity" rated at 47°F and 17°F outdoor conditions.

For help deciding which system fits your home, see our guide on choosing the right air conditioner and our comparison of air conditioner vs HVAC systems.

Step-by-Step: Turning On Heat Using the Remote Control

The most common and convenient way to activate heating on an LG air conditioner is through the remote control. Here’s how to do it:

1. Power On the Unit

Press the “Power” button on the remote. The unit should turn on, and the display panel will light up. If the unit doesn’t respond, check that the remote has fresh batteries and is pointed at the receiver on the AC.

2. Press the “Mode” Button

Locate the “Mode” button on the remote (usually labeled with icons like snowflake, sun, fan, and auto). Press it repeatedly until the display shows “Heat” or a sun/warming icon appears. Each press cycles through the available modes: Cool → Dry → Fan → Heat → Auto.

3. Set Your Desired Temperature

Use the “+” and “–” buttons to adjust the temperature. For comfort and efficiency, set it between 68°F and 72°F. Avoid setting it above 80°F unless absolutely necessary, as this can cause the unit to work harder and increase energy consumption.

4. Adjust Fan Speed (Optional)

Press the “Fan Speed” button to choose between Low, Medium, High, or Auto. “Auto” lets the system adjust fan speed based on temperature needs, which is usually the most efficient option.

5. Confirm and Wait

Once the settings are correct, the unit will begin heating. It may take a few minutes for warm air to start flowing, especially if the outdoor temperature is very low. The system might also run a brief defrost cycle if ice has built up on the outdoor coil.

Example: Using an LG Dual Inverter Window Unit

Let’s say you have an LG LW1517IVSM window air conditioner. You come home on a chilly evening and want to warm up your living room. You grab the remote, press “Power,” then tap “Mode” until “Heat” appears. You set the temperature to 70°F and select “Auto” fan speed. Within minutes, warm air begins circulating, and your room feels cozy.

Using the LG ThinQ App to Turn On Heat Remotely

In 2026, smart home integration is more advanced than ever, and LG’s ThinQ app makes controlling your air conditioner easier and more flexible. With the app, you can turn on the heat before you get home, adjust settings from bed, or monitor energy usage—all from your smartphone.

1. Download and Set Up the LG ThinQ App

Available on the Apple App Store and Google Play, the LG ThinQ app is free to download. Open the app and create an account if you don’t already have one. Follow the on-screen instructions to connect your LG air conditioner to your home Wi-Fi network.

2. Add Your Air Conditioner to the App

Tap the “+” icon in the app and select “Air Conditioner” from the list of devices. The app will guide you through the pairing process, which may involve pressing a button on the unit or entering a Wi-Fi password.

3. Turn On Heat Mode

Once connected, your AC will appear in the app. Tap on it to open the control interface. You’ll see options for Power, Mode, Temperature, and Fan Speed. Tap “Mode” and select “Heat.” Then adjust the temperature to your preference.

4. Use Smart Features

The app offers additional features like:

• Scheduling: Set your AC to turn on heat at 6:00 PM every weekday.
• Geofencing: Automatically turn on heat when you’re 10 minutes from home.
• Energy Monitoring: Track how much energy your heating uses and get tips to save.

5. Voice Control (Optional)

If you have a smart speaker like Amazon Alexa or Google Assistant, you can link the LG ThinQ app to control your AC with voice commands. Say, “Hey Google, turn on the heat in the living room,” and your LG unit will respond.

Example: Pre-Heating Your Home

You’re stuck in traffic on a cold winter evening. Instead of arriving to a chilly house, you open the LG ThinQ app on your phone, select your AC, switch to Heat mode, and set it to 70°F. By the time you walk through the door, your home is warm and welcoming.

Pro tip: Enable the "Energy Saver" mode in the ThinQ app to automatically adjust fan speed and compressor cycling once the target temperature is reached — this can cut heating runtime by 10–15% in well-insulated rooms.

Manual Control: Turning On Heat Without the Remote

What if your remote is lost, broken, or out of batteries? Don’t worry—most LG air conditioners have physical control buttons on the unit itself. Here’s how to use them:

1. Locate the Control Panel

On window units and portable ACs, the control panel is usually on the front or top of the unit. On mini-splits, it’s on the indoor air handler. Look for buttons labeled “Power,” “Mode,” “Temp,” and “Fan.”

2. Press the “Power” Button

Press and hold the “Power” button for 1–2 seconds to turn on the unit.

3. Change to Heat Mode

Press the “Mode” button repeatedly until the display shows “Heat” or a heating icon. The display may be small, so look carefully.

4. Adjust Temperature and Fan

Use the “Temp +” and “Temp –” buttons to set your desired temperature. Then press the “Fan” button to choose your preferred speed.

5. Wait for Warm Air

The unit will begin heating after a short delay. If it doesn’t start, check that the outdoor temperature isn’t too low (below 35°F), as some heat pumps struggle in extreme cold.

Tip: Use a Universal Remote

If your original remote is missing, you can purchase a compatible universal remote online. Make sure it supports LG air conditioners and heat pump functions.

For mini-split installations where the indoor unit is mounted high, consider a split AC indoor unit installation guide to ensure the manual controls remain accessible.

Optimizing Heating Performance in 2026

To get the most out of your LG air conditioner’s heating function, follow these best practices:

1. Maintain Clean Air Filters

Dirty filters restrict airflow and reduce heating efficiency. LG recommends cleaning or replacing filters every 2–4 weeks during heavy use. To clean:

• Turn off the unit.
• Remove the front panel.
• Take out the filter and rinse it with warm water.
• Let it dry completely before reinserting.

2. Ensure Proper Airflow

Keep furniture, curtains, and rugs away from the indoor unit. Blocked vents can cause the system to overheat or shut down. For mini-splits, ensure the indoor unit is mounted high on the wall for optimal air distribution.

3. Protect the Outdoor Unit

If you have a mini-split or central system, keep the outdoor unit clear of snow, ice, and debris. Use a cover during heavy snowfall, but remove it when the unit is running to prevent overheating.

4. Use a Programmable Schedule

Avoid running the heater constantly. Use the remote or app to set a schedule—turn it on 30 minutes before you wake up and off when you leave. This saves energy and reduces wear on the system.

5. Supplement with Insulation

Your AC works harder in poorly insulated homes. Seal windows, add weatherstripping, and use heavy curtains to keep warm air in and cold air out.

Seasonal maintenance makes a measurable difference — our seasonal air conditioning maintenance tips walk through the pre-winter checklist that keeps heat pumps running at rated capacity.

Troubleshooting Common Heating Issues

Even the best systems can have problems. Here’s how to fix common issues when your LG AC won’t heat:

1. Unit Won’t Turn On

• Check the power source: Is the unit plugged in? Is the circuit breaker tripped?
• Test the outlet with another device.
• Replace remote batteries.

2. No Heat or Cold Air Blowing

• Confirm the mode is set to “Heat,” not “Cool” or “Fan.”
• Check if the outdoor temperature is below the unit’s operating range (typically 35°F–40°F for most heat pumps).
• The unit may be in defrost mode—wait 5–10 minutes for it to resume heating.

3. Weak or Inconsistent Heating

• Clean the air filter.
• Ensure vents are unblocked.
• Check for refrigerant leaks (requires professional service).
• The outdoor unit may be iced over—turn off the unit and let it thaw.

4. Error Codes on Display

LG units display error codes like “CH 01” or “CH 09” when there’s a problem. Refer to your user manual or the LG support website for code meanings. Common issues include sensor faults or communication errors between indoor and outdoor units.

5. Unit Shuts Off Unexpectedly

• Overheating: Clean filters and check airflow.
• Power surge: Use a surge protector.
• Thermostat issue: Try resetting the unit by turning it off for 10 minutes.

If troubleshooting doesn’t resolve the issue, contact LG customer support or a certified technician. Attempting complex repairs yourself can void your warranty.

When the unit blows cool air in heat mode, it's often a reversing valve or defrost board fault — our troubleshoot AC blowing warm air guide covers the diagnostic steps that apply to heat pumps too.

Energy Efficiency Tips for 2026

Heating can significantly increase your energy bill, but smart habits can help you save:

• Set the thermostat to 68°F when home and lower when away. Each degree above 68°F can increase energy use by 3–5%.
• Use ceiling fans in reverse (clockwise) to push warm air down.
• Close doors to unused rooms to focus heat where you need it.
• Upgrade to a smart thermostat compatible with LG systems for automated control.
• Take advantage of off-peak electricity rates by scheduling heating during low-demand hours.

In 2026, many utility companies offer rebates for energy-efficient appliances. Check with your provider to see if your LG heat pump qualifies for incentives.

For deeper savings strategies, see our breakdown of the best air conditioning settings for energy efficiency — the same principles apply to heat pump heating cycles.

According to the U.S. Department of Energy, properly maintained air-source heat pumps can deliver 1.5 to 3 times more heat energy than the electrical energy they consume, making them among the most efficient electric heating options available today.

Comparing Control Methods: Which Should You Use?

Choose the method that matches your routine — most households use the app for scheduling and the remote for quick changes.

Defrost Cycle: What to Expect in Cold Weather

When outdoor temperatures drop below roughly 40°F, moisture in the air can freeze on the outdoor coil. LG heat pumps automatically enter a defrost cycle every 30–90 minutes of compressor runtime. During defrost:

• The indoor fan may stop or slow down
• You may hear a whooshing sound as the refrigerant flow reverses
• Cool air may blow briefly from the indoor unit
• The cycle typically lasts 5–15 minutes

This is normal operation — do not turn off the unit. If defrost cycles run excessively (more than once every 20 minutes) or ice builds up beyond the coil onto the fan blades, schedule service.

Frequently Asked Questions

Does my LG air conditioner have heat mode?

Only LG models designated as heat pumps (often marked "HP" in the model number) provide heating. Check your remote for a sun icon or "Heat" label, or verify the model on LG's specification sheet.

Why is my LG AC blowing cold air in heat mode?

The unit is likely in a defrost cycle, which temporarily reverses operation to melt outdoor coil ice. Wait 10–15 minutes; warm air should resume. If it persists, check for low refrigerant or a faulty reversing valve.

Can I use the LG ThinQ app without Wi-Fi?

No — the app requires an active internet connection on both your phone and the AC unit. For local control without Wi-Fi, use the remote or manual panel.

What temperature should I set my LG heat pump in winter?

68°F when occupied, 62–65°F when away or asleep. Each degree lower saves roughly 3% on heating costs. Avoid settings above 72°F to prevent short-cycling and excess wear.

How often should I clean the filter during heating season?

Every 2–4 weeks for standard mesh filters. Households with pets or high dust may need weekly cleaning. A clogged filter reduces airflow, triggering safety shutdowns and cutting heating output.

Will my LG heat pump work below 0°F?

Most residential LG models maintain rated capacity down to 5°F and operate (with reduced output) to -4°F or -13°F on "Low Ambient" models. Below that, supplemental heat is needed. Check your model's extended performance data.

Conclusion

Turning on the heat on your LG air conditioner in 2026 is a simple process once you understand the right steps. Whether you’re using the remote, the LG ThinQ app, or manual controls, activating heating mode takes just a few taps. Remember to confirm your model supports heating, keep filters clean, and use smart scheduling to maximize comfort and efficiency.

With regular maintenance and a few energy-saving habits, your LG air conditioner can keep your home warm and cozy all winter long. If you run into issues, don’t hesitate to consult the user manual or reach out to LG support. Stay warm, stay efficient, and enjoy the advanced comfort that modern LG technology brings to your home.

Ready to optimize your system further? Explore our top-rated HVAC systems for residential use to compare LG against other leading brands for whole-home comfort.