The MRCOOL DIY 5th Gen 48,000 BTU 4-Zone Mini Split System isn’t just known for its no-vacuum Quick Connect install—it also delivers powerful remote and smart-home control features to manage your comfort zone-by-zone.
Whether you're trying to automate your family’s heating schedule, save money while you're on vacation, or integrate with Alexa or Google Assistant, this guide will show you exactly how to make the most of your MRCOOL smart system.
📦 What Comes in the Box?
Each indoor unit in your MRCOOL 4-zone kit comes with:
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🕹️ 1 remote control (batteries included)
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📘 Setup manual with programming instructions
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🔌 Optional SmartHVAC WiFi module (may be bundled or sold separately)
Check the product packaging: if you don’t have a WiFi module, you’ll need to purchase one per indoor unit to enable app-based control.
🔗 SmartHVAC WiFi Module – MRCOOL
📲 Setting Up the MRCOOL SmartHVAC App
The MRCOOL SmartHVAC app is your control hub for each zone, replacing the need to use remote controls daily.
📥 Download the App
🔧 How to Pair the App to Each Indoor Unit
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Install the SmartHVAC WiFi module into the designated port behind your unit's front panel.
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Turn on the unit using the remote.
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Open the SmartHVAC app, create a profile, and tap "Add Device".
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Select your network (must be 2.4GHz) and enter your WiFi password.
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Press the WiFi button on your remote for 5 seconds until the display blinks.
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Confirm pairing on the app screen.
💬 Tip: Rename each zone by room (e.g., “Living Room,” “Office”) to make voice commands and scheduling easier.
🎛️ Remote Control Tips & Hidden Functions
Even without the app, the MRCOOL remotes offer impressive functionality.
Key Buttons & Functions:
| Button | Use |
|---|---|
| Mode | Cycle between Cool, Heat, Dry, Fan, Auto |
| Fan | Set speed (Low, Med, High, Auto) |
| Swing | Adjust vertical airflow |
| Timer | Schedule on/off times |
| Sleep | Activates overnight energy-saving mode |
| LED | Toggle display on/off |
| WiFi | Used to pair app (press 5 seconds) |
📘 Use the "Follow Me" function to let the remote's temperature sensor guide the zone setting rather than the wall unit.
🧠 Using Scheduling & Automation Features
The SmartHVAC app allows full weekly programming for each zone.
🗓️ How to Automate Your Zones:
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Tap the zone you want to automate
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Select “Timer” → “Add Schedule”
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Set specific temps, modes, and times
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Repeat for weekdays vs. weekends
💡 Popular schedules:
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Sleep Mode: 10pm–7am, 70°F in bedrooms
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Away Mode: 8am–4pm, system off
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Return Home Mode: 5pm–9pm, 72°F in living zones
🗣️ Voice Assistant Integration
Yes, MRCOOL works with Alexa and Google Assistant via the SmartHVAC app.
🎤 Voice Commands You Can Use:
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“Alexa, set the bedroom to 70 degrees.”
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“Hey Google, turn off the living room AC.”
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“Alexa, switch the office to heat mode.”
To set this up:
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Pair your zones in the SmartHVAC app
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Enable the SmartHVAC Alexa skill or Google Assistant service
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Link your MRCOOL account
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Assign rooms for voice commands
📶 WiFi Setup Troubleshooting Guide
| Problem | Solution |
|---|---|
| ❌ App won’t find the unit | Use 2.4GHz WiFi only, not 5GHz |
| ❌ Can’t pair a new zone | Ensure WiFi module is inserted properly |
| ❌ App freezes on connection | Restart router and force close app |
| ❌ Zone disconnects randomly | Update app and check signal strength |
| ❌ Voice commands not working | Re-link Alexa or Google account |
💡 Re-pairing only takes a few minutes—reset the WiFi module and try again if needed.
💡 Smart Energy-Saving Hacks
Smart features don’t just add convenience—they help lower your energy bills.
⚡ Try These Tips:
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Turn off unoccupied zones using the app
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Use Dry Mode on humid days to reduce AC run time
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Enable Sleep Mode to increase temp automatically at night
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Set fan to Auto for variable speeds = lower draw
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Use timers to avoid overnight operation when not needed
📘 According to the DOE, properly using programmable settings can save 10–30% annually on heating and cooling.
🔗 U.S. DOE Energy-Saving Thermostat Guide
🔁 Future Updates and Integration Potential
🔄 App Updates:
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Firmware and app versions update regularly (about twice/year)
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Update via App Store or Google Play
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Notifications will appear in the app when updates are available
🧩 Future Possibilities:
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HomeKit integration (not yet supported)
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IFTTT support (possible via third-party hub)
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Unified multi-zone dashboard view (in testing by MRCOOL)
💬 Pro Tip: Check the MRCOOL DIY app blog for release notes and updates.
📋 Final Setup Checklist for All 4 Zones
| Task | Complete? |
|---|---|
| SmartHVAC app downloaded and installed | ✅ |
| WiFi modules inserted and paired | ✅ |
| Each zone renamed in app | ✅ |
| Daily/weekly schedules programmed | ✅ |
| Alexa/Google Assistant linked | ✅ |
| Remote batteries checked and tested | ✅ |
| WiFi router placement verified | ✅ |
✅ Final Takeaway
Smart control is one of the biggest perks of owning a MRCOOL DIY system—especially when managing four separate zones. With the SmartHVAC app and remote features, you can customize every room’s comfort and reduce energy waste—without paying a pro or sacrificing convenience.
In the next topic we will read about: Is the MRCOOL 48,000 BTU 4-Zone System Right for Your Home Layout?
