Mysa for Central HVAC Installation (Overview)Updated 6 days ago
Installing Your Mysa for Central HVAC: Overview Guide
Getting ready to install your Mysa for Central HVAC Smart Thermostat? This guide gives you a clear overview of what’s involved — from unboxing your thermostat to powering it on for the first time. Whether you’re a confident DIYer or an HVAC professional, you’ll know exactly what to expect and when to call in a pro.
What You’ll Accomplish
By the end of this guide, you’ll understand how to:
Unbox and prepare your Mysa for Central HVAC.
Mount the thermostat wall plate.
Wire it to your HVAC system.
Attach the main display and power it on.
Pair it with the Mysa app to start controlling your comfort.
If you’re comfortable handling low-voltage wiring, this can be a straightforward DIY project. But if your system setup is more complex, we’ll help you recognize when it’s best to bring in a professional.
Safety First
Before doing anything else:
Turn off power to your HVAC system at the breaker or disconnect switch.
This is the most important step in any thermostat installation. Even though Mysa for Central HVAC is a low-voltage thermostat, working with live wires can cause injury or damage your equipment. Always confirm that power is off before touching any wiring.
Tip: Use a voltmeter to double-check that no voltage is present on any wires before proceeding.
Tools You’ll Need
Having the right tools on hand helps make the installation smooth and efficient. You’ll need:
Phillips or flat-head screwdriver set
Wire strippers
Voltmeter or multimeter
Smartphone or camera (for taking photos of your current wiring)
Pro Tip: Before disconnecting your old thermostat, take a clear photo of the existing wiring. It’s the easiest way to double-check connections later.
What’s in the Box
Your Mysa for Central HVAC Thermostat package includes:
Mysa for Central HVAC Thermostat — Main Display & Wall Mount
Mounting screws and anchors
Wire label stickers
Installation documentation
If your system doesn’t have a dedicated C-wire, you may need to install the Mysa C-Wire Power Adapter (CWA) to ensure your thermostat has continuous power.
Learn more about installing the Mysa C-Wire Adapter.
Compatibility Quick Check
Before you start wiring, make sure your HVAC system is compatible with Mysa for Central HVAC.
Mysa for Central HVAC is compatible with:
24 V low-voltage HVAC systems
Conventional forced-air and hydronic systems (furnaces, boilers, heat pumps, and AC)
Systems with single or multi-stage heating/cooling
Single or multi-fan speed systems (Fan Coil Units and PTAC)
Mysa for Central HVAC is not compatible with:
Line-voltage systems (baseboard, in-floor, or fan-forced heaters)
Millivolt systems (often found in older gas fireplaces)
Communicating or proprietary thermostats (e.g., some high-end HVAC systems)
Not sure what type of system you have?
Check our compatibility guide for a simple walkthrough before you begin.
Installation at a Glance
Here’s a high-level look at the installation process:
Note: For step-by-step installation instructions, follow the in-app “Add Mysa” installation and configuration flow.
Mount the Wall Plate
Use the included screws and anchors to attach the wall plate to your wall. Ensure it’s level, using the built-in bubble level, before tightening.Wire Your Mysa for Central HVAC
Connect each labeled wire to the corresponding terminal. Refer to your system photo for accuracy.Attach the Thermostat
Align and snap the thermostat main display onto the wall mount.Restore Power
Turn the breaker back on or flip the switch to power up your thermostat.Configure Your Thermostat
Applying a configuration code is required for your thermostat to function with your HVAC system. The configuration code can be entered manually on the device or through the app during pairing and setup.Pair with the Mysa App
Follow the in-app instructions to connect Mysa to your WiFi network and start controlling your system.
Once powered on, Mysa will guide you through setup in the app. You can also use the Mysa app to fine-tune your preferences and schedules.
DIY or Call a Pro?
Mysa for Central HVAC is designed for easy installation in most single-thermostat, single-transformer systems — perfect for confident homeowners who are comfortable with basic electrical work.
However, we recommend hiring a professional if:
Your system has two transformers (for example, separate heating and cooling systems).
You’re working with zone controllers or multi-zone HVAC systems.
You’re unsure about your wiring labels or connections.
Your existing thermostat has unlabeled or non-standard wires.
An HVAC technician can install Mysa for Central HVAC safely and verify compatibility with your specific setup.
Helpful Links & Next Steps
Once you’ve reviewed this overview, check out our step-by-step installation guides for more detail:
If you encounter issues, our Mysa Support Team and community resources are always here to help.
Pro Tips for a Smooth Install
Label wires clearly before disconnecting them.
Use your smartphone camera to take multiple angles of your existing setup.
Double-check power is off before wiring.
Keep small screws in a dish or container during installation to avoid losing them.
Test system operation after setup to ensure heating, cooling, and fan modes work as expected.