Installing a Mini Split AC System

Mini splits are efficient, budget-friendly systems that use advanced heat pump technology to heat and cool your home. In the following guide, we’ll show you step-by-step how to perform a mini split installation, what to expect during the process, and whether hiring a professional might be a better alternative to a DIY approach.

Mini Split Installation: What to Expect Step By Step 

Step 1. Choose the right location for indoor and outdoor units.

For your indoor mini split installation, choose a wall that is directly connected to the outdoors. It must be large enough for the air handler. Make sure it won’t be blocked by furniture or lighting fixtures. Also, avoid direct sunlight. 

For your outdoor ductless AC system installation, choose a spot that’s either on the ground, rooftop, or on an outside wall. If you opt for the ground, you’ll need a secure pad--which can either be made by you or purchased. 

Step 2. Install the mounting bracket. 

Locate the studs in your wall and mount the plate to them. Access the mounting hole locations on the mounting bracket. They should align with the typical stud layout. Use a stud finder, if needed. Place the bracket to the studs and use a leveler to ensure it's fully level before you begin drilling. 

Drill pilot holes using a bit that’s smaller than the shaft holes you’re using. You’ll also need to drill hole for the refrigerant wiring and lines. 

Step 3. Run the line set and electrical wiring.

Your mini split AC unit installation also involves running wiring to the unit. The line set is a pair of copper pipes that carry refrigerant between the indoor and outdoor units. Alongside the line set, you’ll also run electrical wiring and a condensation drain line, usually through a small hole drilled in the wall. 

Step 4. Connecting refrigerant lines and testing the system.

Once the line set is in place, the refrigerant lines are connected to both the indoor air handler and the outdoor condenser using flared fittings. After securing the connections, a vacuum pump will remove moisture from the system and open refrigerant valves. 

Should You DIY or Hire a Pro for a Mini Split AC System Installation? 

So, should you perform your own ductless AC system installation? The answer is, it depends. 

Here are some things to consider.

Pros of DIY

• Save money on labor costs (upwards of $1000)

• DIY kits are available to make the process easier

• Install it on your own timetable

Cons of DIY

• Steep learning curve if you aren’t already familiar with wiring etc. 

• Electrical work may require a licensed electrician anyway

• Warranty risks if there is an improper installation

Pros of Hiring a Professional

• Guaranteed workmanship 

• Automatic code compliance

• Warranty protection 

• Better long-term performance

Cons of Hiring a Professional

• More expensive (upwards of $1,400)

• Scheduling delays

• Less personal  control over the project 

If you opt for a DIY mini split installation you will face a significant learning curve, while hiring a professional is going to set you back quite a bit financially. The choice comes down to what’s best for you and your pocketbook. Either way, you can purchase all the mini split AC units you need right here at A Home Selection.

Browse our mini splits

Frequently Asked Mini Split Installation Questions

Can I install a mini-split AC myself?

Yes, many mini splits are designed for DIY installation. 

How much does it cost to install a mini-split system?

Professional installation starts at $1,500, depending on the zone and system size. 

Is it legal to install your own mini-split?

Yes, in most areas it is legal to install a mini split yourself. Check your local codes and permit requirements. 

Where not to install mini-split?

Don’t install your mini split in enclosed, cramped places where there are electronics or light fixtures. 

Do mini splits use a lot of electricity?

No. Part of the advantage of doing a mini splits installation is it reduces your electric bill in the long run.

Do you need an electrician to install a mini-split?

Yes, for safety and code compliance, we do recommend speaking with an electrician. 

Why are mini splits so expensive to install?

They require specialized equipment, labor, and a complex multi-zone setup. 

Can you write off a mini-split?

That depends on your home and tax credits that may or may not apply for energy efficiency.