As someone who’s installed hundreds of mini split systems over the past decade, I can tell you that while these installations might seem complex, they really come down to a few key components. Today, I want to walk you through what goes into a basic mini split installation, whether you’re looking at a simple one-to-one setup or something more involved.
First things first – before you even think about grabbing any tools, you need to figure out two crucial things: where your outdoor unit’s going to sit and where that indoor unit needs to be. Trust me, this decision affects everything that follows.
Planning Your Installation
Before we dive into the components, there are two critical decisions that will shape your entire installation:
- Where to put the outdoor unit
- Where to mount the indoor unit
Let’s break these down.
Outdoor Unit Location
The outdoor unit needs proper spacing and accessibility. Here’s what I’ve learned from years of installations:
- You’ll need 6-10 inches of clearance from the wall it will sit up against. These units are designed to be able to be up against a wall
- Allow at least 2 feet of space in front for proper airflow since the fans are pointed out.
- Consider service access – you’ll thank yourself later. If necessary it may be needed to check for leaks or check replace components inside the unit. Most of the units have access to wiring and other components on the right side of the units
- Think about mounting options: ground pad or wall bracket
- Depending on several factors you may not have a choice. If using a pad you will want to make sure you have some leveling sand or gravel if placing in a yard
- Power access is crucial – most units need 220V, though some smaller units (¾-1 ton) can run on 110V. Getting power to unit has to be considered for the outdoor location
- If replacing the unit for the entire home you can use the same power. Keep in mind that the breaker requirements for switching to an inverter based system are less therefore you will want to make sure to install the correct breaker.
Indoor Unit Placement
This is where experience really comes into play. The location of your indoor unit affects both performance and installation complexity. For ductless units, I always recommend:
- Try to avoid using a condensate pump if possible. Let’s be clear: condensate pumps are fine if absolutely necessary. But you will need to clean them occasionally. It adds another point of failure so if you can avoid it, I highly recommend it.
- Look for nearby bathroom or kitchen drain lines
- Consider placing it on an exterior wall for easier drain line routing.
- For ceiling cassettes, verify truss locations if possible before committing because it may be difficult to get a condensate line, refrigerant line to the units, let alone will it actually fit.
Essential Components
Let’s break down what you actually need for different types of installations.
For One-to-One Ductless Systems
Outdoor Unit Components:
- Mounting solution (pad or wall bracket)
- Electrical whip
- Disconnect box
- Surge protector
- Anchor screws
- Leveling materials (sand/gravel if using a pad)
Indoor Unit Components:
- Pre-insulated copper lineset
- Communication wire
- Mounting hardware
- PVC drain line components
For Ducted Systems
The outdoor components remain the same, but the indoor setup gets more interesting. Here in DFW, we typically install Air Handlers and Furnaces in attics (though I’ll be honest – 130°F attic temperatures aren’t ideal). This is just how it’s done here and how houses are built. If remodeling or building a house I highly recommend not doing it this way because it decreases the life of a unit when installed in attic that doesn’t have spray foam insulation. It also increases the tonnage of the unit needed.
You’ll need everything from the ductless list plus:
- Filter base (for vertical mounting)
- Supply plenum
- Hanging hardware (straps or uni strut with all-thread)
- Drain pan
- Additional ductwork components
Regional Considerations
A quick note about location differences – while we deal with attic installations here in Texas, folks up north often have the luxury of basement installations where temperatures are much more moderate. Always consider your local climate and building structure when planning your installation.
Conclusion
While this covers the basic components needed for a mini split installation, remember that each job has its own unique challenges. Whether you’re installing a simple wall-mounted unit or a more complex ducted system, proper planning and having all the right components on hand makes the difference between a smooth installation and a headache.
In future posts, I’ll dive deeper into specific installation methods. I will cover my method for analyzing location and thought process for installing units in certain locations. This is especially important for multi-zone systems, which definitely deserve their own detailed coverage. After all, there’s nothing worse than getting halfway through an installation and realizing you can’t install something the way you want or you’re missing that one crucial component!
Feel free to reach out with questions about your specific installation needs – after 11 years in the business, I’ve probably seen and solved similar challenges.
