Cassettefrom $1,312
What does a DIY mini split really cost, all in?
Short answer: Expect the system price plus about $390 to $430 in parts most people need, plus an electrician and a permit. With our prices that's roughly $2,100 to $2,900 for a 12K DIY Select room, $3,100 to $3,900 for a 12K DIY 5th Gen room, and $6,200 to $7,000 for a 4-room DIY 5th Gen system. The line items are below so you can swap in your own numbers.
What's in the box, and what isn't?
Every MRCOOL DIY single zone system comes with the indoor unit, the outdoor unit, a remote and a pre-charged Quick Connect line set. DIY Select and DIY EasyPro include an 11.5 ft line set. The DIY 5th Gen includes 25 ft.
What no system includes:
- A disconnect switch by the outdoor unit (code requires one within sight of it)
- The whip that runs from the disconnect to the outdoor unit
- A pad or wall bracket for the outdoor unit
- A line set cover for the outside wall
- The breaker and the wire from your panel
Those gaps are where most budget surprises come from. Here's what each one costs in our store.
How much are the extra parts?
| Part | Price from | Who needs it |
|---|---|---|
| Disconnect switch, 60A non-fused | $59 | Everyone |
| Non-metallic whip | $72 | Everyone |
| Equipment pad (E Lite) | $172 | Ground-mounted outdoor unit |
| Condenser wall bracket | $127 (9K to 18K), $147 (24K and 36K) | Wall-mounted outdoor unit |
| LineGuard cover kit, 12 ft | $129 | Anyone who wants the lines covered outside |
| Extra line set | 16 ft $227, 25 ft $264, 35 ft $502, 50 ft $587 | Runs longer than the included set, on any of the three lines |
| Coupler kit | $425 (6K to 18K), $455 (24K and 36K) | Runs of 66 or 75 ft |
Watch what the coupler kit adds to a long run, so you know whether that line item belongs in your budget.
All prices are from our store (prices as of November 2026). Bigger pipe sizes cost more on line sets, so a 16 ft line set for a 24K or 36K unit is $271.
Pick either the pad or the bracket, not both. With the disconnect, whip and one cover kit, the extras come to $387 with a small bracket and $432 with a pad.
What does a single zone cost, start to finish?
Two common jobs: a 12K bedroom or office on the budget line, and the same room on the top line. Both are 115V, so the circuit is a simple one.
| Line item | 12K DIY Select | 12K DIY 5th Gen |
|---|---|---|
| System | $1,399 | $2,359 |
| Disconnect + whip | $131 | $131 |
| Mount | $127 wall bracket | $172 pad |
| LineGuard cover kit | $129 | $129 |
| Parts total | $1,786 | $2,791 |
| Electrician, typical | $300 to $800 | $300 to $800 |
| Permit, typical | $50 to $300 | $50 to $300 |
| All in | $2,136 to $2,886 | $3,141 to $3,891 |
This assumes the Select's 11.5 ft line set reaches. For a run of 12 to 25 ft, add a longer pre-charged line set to the Select column, from $227 for 16 ft or $264 for 25 ft, and check the line set chart in the Select manual for the exact part. The 5th Gen already has 25 ft in the box, so the same run costs it nothing extra.
The electrician range is what a straightforward dedicated circuit typically costs. A panel far from the outdoor unit, a full panel, or a run through finished walls pushes it higher. Ask for a written quote that includes the breaker and wire.
The $960 gap between those two systems buys a lot: higher efficiency, leak detection, Follow Me, a 25 ft line set, and a 5 year parts / 7 year compressor warranty instead of 1 year / 2 years. Our line-by-line buying guide covers whether that's worth it for your room. In between sits the DIY EasyPro at $1,599 for 12K.
Next: which parts of the install can you do yourself, and which should you hire?
What does a 4-room system cost?
Multi-zone is DIY 5th Gen only. A 4-room wall unit system starts at $4,836 and comes with a 16 ft line set per room. In real houses at least one room is usually farther away, so this example adds one 35 ft line set.
| Line item | 4-room DIY 5th Gen, wall units |
|---|---|
| System (outdoor unit, 4 air handlers, four 16 ft line sets) | $4,836 |
| One 35 ft line set for the far room | $502 |
| Disconnect + whip | $131 |
| Equipment pad | $172 |
| Two LineGuard cover kits | $258 |
| Parts total | $5,899 |
| Electrician, 230V circuit, typical | $300 to $800 |
| Permit, typical | $50 to $300 |
| All in | $6,249 to $6,999 |
One outdoor unit means one circuit, one disconnect and one pad, which is why multi-zone parts costs grow slowly as you add rooms. What grows fast is line set length. Measure every room before you order with our line set length guide.
Shop the room counts in the multi-zone collection. Prices from: 2 rooms $2,923, 3 rooms $3,607, 4 rooms $4,836, 6 rooms $7,332. Cassette systems cost more, from $4,633 for 2 rooms.
How does that compare to a professional install?
National cost guides put a typical pro-installed single zone mini split around $3,000, with quotes ranging from about $2,000 to well over $10,000 depending on brand, size and the house. Pro-installed multi-zone systems typically run from under $3,000 for a small 2-room job to $18,000 or more, and installers commonly figure a few thousand dollars per zone.
| Job | DIY with our prices | Typical pro quote |
|---|---|---|
| One 12K room, budget line | $2,136 to $2,886 | Around $3,000 |
| One 12K room, top line | $3,141 to $3,891 | Around $3,000, higher for premium brands |
| Three rooms (national range) | From $3,607 for the system | $3,400 to $13,400 |
| Four rooms | $6,249 to $6,999 | A few thousand dollars per room |
| Five rooms (national range) | From $5,963 for the system | $4,800 to $18,000 |
Be honest with the single room math. If a local installer quotes you $3,000 for a budget brand, a DIY 5th Gen doesn't save money on that one room. You'd be paying for its efficiency and warranty, plus your own day of work.
The DIY savings get large on multi-room jobs when local quotes land in the middle or top of those ranges. Get one or two local quotes anyway. They take an hour and show you which side of the line you're on.
Next: how do you find and vet a local electrician or installer?
What costs catch people off guard?
What if my panel is full?
Then the electrician's number can grow well past the typical range, because you may need a subpanel or a service upgrade. Take a photo of your panel with the door open and send it with the quote request.
What if I don't own the tools?
Most people have the drill, level and wrenches. The usual purchases are a 3 in hole saw, a torque wrench, and a core bit if the wall is brick or block. Budget for them before you order, not on install day.
What if I order the wrong size?
That's the most expensive mistake on this list. A change-of-mind return loses the 3% card fee, shipping both ways and MRCOOL's 10% restocking fee. On a $2,359 system that's about $71 plus $236, before freight. Size it first with the sizing guide.
What about shipping and tax?
Shipping is free to the 48 contiguous states. Hawaii and Alaska ship by quote. We charge sales tax only in CA and WA. Orders leave our Kentucky warehouse in 2 to 4 business days after the order is verified, then spend 3 to 7 days in transit.
Build your own budget
Write down the system price for your size, add $131 for the disconnect and whip, add a pad or bracket, add a cover kit per outside run, then get an electrician quote and call the building department about the permit fee. That's your real number.
Not sure which size goes on line one? Call us at +1 (844) 999-9725, Monday to Friday, 9 AM to 5 PM EST, and we'll help you pick the system. You can also shop all single zone systems or the accessories directly.
