I installed it over a weekend, called GWIN, and a licensed tech was at my place that week to pull the vacuum and charge it. The warranty was active before he left the driveway. No other brand does this.
Meet GWIN™ Assisted DIY™
Do it yourself. Not by yourself: DIY savings with pro assurance.
The only DIY HVAC brand that includes a FREE Tech with every system. We make it simple…
Tech guaranteed in all 48 states
10-year parts warranty
Full refund if we fail
R-32, rated to -22°F
1
Purchase direct
Figure your system with our online tools, or just call or message our in-house techs — and get your new system shipped free.
2
Install at your own pace
GWIN™ is built for a professional-looking finish — cut-to-length linesets and flareless, easy connect adapters.
3
Call and we send the tech
It's that easy. We send a local certified technician to inspect, pressure-test, vacuum, and charge your new system.
Describe your home. We size and build it.
Name a size to jump straight to it — or describe your home and we'll size every room and build the system.
Try:
see products
what are the SEER ratings of the multi?
i need a multi
what are the heating capabilities?
tech support
two 9k
Licensed tech included
GWIN places a tech to pressure-test, vacuum, charge & certify every system. Local → Drive → Fly → or full refund.
Year 1 bumper-to-bumper
Parts, labor, refrigerant & commissioning covered the first year.
10-yr parts + compressor
Free shipping to your door. Fully transferable with the home.
✦ System
$0
estimated total
Guaranteed in all 48 contiguous states
Never failed to place a tech
Coverage · 48 contiguous states
A guaranteed tech in every zip code.
Every GWIN system ships with a licensed HVAC tech for commissioning — local, drive, or fly. Check your ZIP and watch your area light up.
Guaranteed Tech Network
Live coverage
Guaranteed Tech active across all 48 contiguous states
Check your area
Enter your ZIP to confirm a tech is guaranteed where you live.
Build your system now
Confirm your ZIP to start your build
What makes it Assisted DIY™
A FREE tech is included with every GWIN™ system.
Having a tech already included in the price of every GWIN™ system is what makes our systems Assisted DIY™ — and choosing Assisted DIY™, with a guaranteed tech already included in the purchase, is what makes GWIN™ the best choice in DIY solutions.
Why a free, guaranteed tech changes everything
A tech now — and later
Not only will you have a tech now, but you'll also have one later if you ever need one.
Verified, leak-free work
There's nothing comparable to having a licensed tech verify your work and assure you don't have any leaks before startup.
Backed by our guarantee
And it's paired with our guarantee: if the tech missed something, we'll fix it free.
What homeowners say
Real installs. Real techs. Real reviews.
Homeowners who installed it themselves — and had a certified GWIN™ tech finish the job, certify it, and stand behind it.
4.89★
average rating · 35 reviews
100%
Tech-placement rate
48
States covered
I was nervous about the lineset, but the easy-connect fittings meant I just cut it to length and clicked it together — no flaring, no torque wrench. Looks like a pro did it. The tech handled the refrigerant.
A control board failed in month eight. One call to GWIN — they covered the part, the labor, and the tech visit. Zero bill. I've never had a DIY warranty actually pay out like that.
I'm two hours from the nearest city. I figured "guaranteed tech" wouldn't apply to me — but GWIN drove one out and covered the trip. They put it in writing before I ever paid.
I priced it against the big-name DIY brand — basically the same. But GWIN threw in the tech, a real first-year warranty, and 10-year parts. Same money, completely different deal.
It dropped to -15°F here and the multizone kept the whole house warm without flinching. The R-32 system heats better than the unit it replaced. Install was a Saturday project.
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What DIY mini split brands don't tell you — five hidden problems GWIN solves.
Before you buy any DIY mini split
What they don't tell you until it's too late.
You've done the research. You know DIY saves money. But there are a few things most brands quietly leave out — things you'll only find in the fine print, or find out the hard way. Read this first.
01
“DIY” means no tech — until your warranty needs one.
Most DIY brands are marketed as self-install right up until something goes wrong. Then you read the fine print: warranty requires professional installation documentation. Good luck finding a licensed HVAC tech willing to service a system they didn't sell. That's not a warranty. That's a trap.
GWIN™ involves a certified tech from day one. Your install is documented, certified, and on record — so your warranty is bulletproof before anything ever goes wrong.
02
If it arrives damaged and you install it anyway — that's on you.
Your system ships across the country in a box. If there's internal damage you don't catch before installation — a bent coil, a damaged valve, a cracked fitting — and you install it, most DIY brands consider it an install error. You own it. The warranty is gone.
GWIN's tech inspects the system at commissioning before certifying it. If there's a pre-existing issue, it's caught before it becomes your problem — and covered under our bumper-to-bumper first year.
03
One loose connection. One missed tighten. All yours.
Didn't tighten a line fitting quite right? With every other DIY brand, that slow refrigerant leak is entirely your fault and entirely your cost — the diagnostic visit, the labor to find it, the labor to fix it, and the recharge. And because there was no professional on record, the warranty won't touch it.
GWIN's tech pressure tests every connection before startup. If a fitting wasn't tight enough, it's caught and fixed at commissioning — not six months later when your system stops cooling.
04
You can install it. You just can't get anyone to service it.
Installing a DIY mini split is straightforward. Servicing one years later is a different story. Most local HVAC companies have a policy against working on systems they didn't sell. You'll call around, get turned down, and eventually find someone who charges a premium just for showing up — if you find anyone at all.
GWIN's nationwide tech network doesn't disappear after install day. Need service? Call GWIN. We have the network, the record of your install, and the parts relationship to handle it.
05
No vacuum pull means you'll never really know if it's right.
A proper startup requires pulling a deep vacuum to remove moisture before charging. Without it, your system runs on contaminated refrigerant from day one — reducing efficiency, increasing wear, and quietly shortening its life. Most DIY homeowners skip this because they don't have the equipment. Most brands don't tell you how important it is.
GWIN's tech pulls a proper vacuum at every install — with professional equipment, logged results, and your system charged exactly right. Not close. Right.
Every one of these problems is solved by GWIN™ — and none of them cost you a dollar more than the DIY brand you were already looking at.
Tech included free
Backed by a written guarantee
Never failed to place a tech
The GWIN tech guarantee
We find a tech. Or you keep it free.
What happens if GWIN can't find a tech in my area?
The #1 question we get: "What if you can't find a tech in my area?" Here's exactly what happens.
Step 1 — First
Local tech dispatched
We tap our nationwide network — already built in some of the toughest, most rural areas in the country. Chances are, someone's already near you.
Step 2 — If needed
We drive to you
Travel-ready techs are on standby across the country. If there's no local tech, we send one who's willing to make the drive. We coordinate it. We cover it.
Step 3 — If still needed
We fly one out
Our in-house GWIN techs will board a plane and fly to your home within two weeks of your install. That's not a hypothetical — that's our actual process.
Step 4 — If we fail
Full refund. You keep the system.
If we cannot get a certified tech to you within 30 days of delivery, we refund 100% of your purchase price. No returns. No restocking fees. The equipment is yours, free.
No other DIY brand in America will say that. We say it in writing. Valid for the contiguous 48 states. No fine print. No exceptions.
1-year bumper-to-bumper
10-year parts + compressor
Transfers with your home
The GWIN worry-free warranty
Bumper-to-bumper. Full coverage. One full year.
What does the GWIN year-one warranty cover?
Parts. Labor. Refrigerant. All of it. For 12 months after a certified tech commissions your system. No other DIY brand in America offers this. Not even close.
What's covered — all of it, for year one
Control boards
Full electronics, PCBs, and control modules — replaced at no cost.
Refrigerant
Any refrigerant loss for any covered reason — fully recharged.
Labor
Tech visit, diagnostic, repair — all labor covered. Zero bill.
All parts
Every component in the system. If it fails, we replace it.
Compressor
Covered in year one — and continues through year 10.
Diagnostics
We find the problem too. No charge for the diagnosis call.
Every other DIY brand
Control board fails — you pay parts and labor
Refrigerant leak found — you pay for the recharge
Tech visit to diagnose — you pay the service call
Commissioning labor — you pay the tech yourself
Warranty voids if no pro install on record
GWIN — year one
Control board fails — GWIN covers parts and labor
Refrigerant issue — GWIN covers the full recharge
Tech visit to diagnose — GWIN covers it entirely
Commissioning labor — GWIN covers the tech's visit
Warranty bulletproof — a licensed pro is on record
How the coverage timeline works
Install day
You install. Tech arrives. System is certified.
Tech runs a full leak test and commissioning inspection. Any pre-existing issues are resolved before startup. GWIN covers the commissioning labor.
Months 1–12
Full bumper-to-bumper coverage activates
Every part. All labor. Refrigerant. If anything fails or underperforms for any covered reason — GWIN sends a tech and covers everything. The most complete first-year coverage in DIY HVAC.
Years 2–10
10-year parts & compressor warranty continues
Labor and refrigerant become the owner's responsibility after year one — but every major component, including the compressor, remains covered. Fully transferable. No installer requirement.
Buying a GWIN is the only time you can install a mini split yourself, have a licensed tech certify it, and walk away knowing that if anything at all goes wrong in the next year — the board, the refrigerant, the labor, the diagnostic — it's covered. Not "call us and we'll see." Covered. In writing. No fine print.
That's not just the best warranty in the DIY space. That's one of the best first-year warranties in the HVAC industry, period.
10-year parts + compressor
Free shipping to your door
48-state parts network
The GWIN parts guarantee
Parts. Shipped directly. For 10 years.
How do I get replacement parts for a GWIN mini split years later?
The second biggest fear after installation — what happens when you need a part years later? Most brands leave you hunting. GWIN ships it straight to your door.
You call GWIN
One call. No hunting for a tech or a parts house. We handle everything from here.
We find your closest supply house
Our national parts network locates the nearest stocking location to you.
Part ships to your door
Direct to you. No contractor middleman. No waiting in line at a counter.
10-year parts & compressor warranty
One of the strongest coverage windows in the industry — covered from day one.
Fully transferable
The warranty follows the equipment, not the owner. Sell your home — the coverage goes with it.
No installer requirement
The warranty is valid regardless of who installed it or who owns it now.
National supply house partner
GWIN-stocked parts available across the country — not waiting on overseas shipments.
Every other DIY brand
Find your own tech to diagnose the issue
Find your own parts house that stocks your brand
Warranty may not transfer to new owner
No national distribution network
GWIN
One call to GWIN — we handle everything
National partner ships from closest location to you
Warranty transfers with the equipment, always
Built-in nationwide parts distribution from day one
No flaring tools
No torch
Tech delivers & leak-tests refrigerant
The GWIN install experience
Installs like every other brand. Looks and performs like a pro did it.
How does a GWIN mini split install differ from other DIY brands?
If you've seen one mini split install, you've seen them all — until GWIN. Same process. Better result. And one critical difference that separates a DIY-looking install from a professional one.
The dirty secret of every other DIY brand
Pre-charged linesets can't be cut to length. So homeowners coil the extra lineset right next to the unit — sometimes 5 or 10 feet of it, bundled against the wall. It looks terrible. But more importantly, coiled lineset traps oil inside the refrigerant circuit. Over time that oil doesn't return to the compressor the way it should, which shortens the life of your system. A completely avoidable problem — and every other DIY brand just accepts it.
GWIN doesn't.
Every other DIY brand
Pre-charged lineset — cannot be cut to length
Excess lineset coiled at the unit — looks unprofessional
Coiled lineset traps oil, shortens compressor life
No flare required — but no flexibility either
You handle refrigerant or skip pro verification entirely
GWIN easy-connect fittings
Cut lineset to exact length — just like a professional
Clean, tight, professional-looking install every time
No coiling, no oil traps, full system longevity protected
No flare. No torque wrench. Just cut and connect.
Never touch refrigerant — our guaranteed tech handles it
How the GWIN install actually works
1
Measure your run
Determine the exact lineset length you need — just like any professional would.
2
Cut to length
Cut the lineset clean. No flaring tool. No torque wrench. No special skills required.
3
Easy-connect fitting
Slide on our flareless easy-connect fitting. Tightens simply and seals professionally.
4
Tech handles the rest
No vacuum. No refrigerant handling. Our guaranteed tech pulls the vac and charges it right.
The tools you'll need
No specialty HVAC gear, no flaring kit, no vacuum pump. Just basic hand tools most homeowners already own.
Level
Drill
Hole saw
Small pipe cutter
Screwdrivers
Wrenches
Tape measure
Lineset flexibility
GWIN: cut to exact length
· Others: coil the excess
Install appearance
GWIN: professional
· Others: looks like a DIY job
System longevity
GWIN: oil returns properly
· Others: oil trapped in coil
Flare required
GWIN: never
· Others: always
Refrigerant handling
GWIN: tech does it
· Others: you or nobody
Vacuum pull
GWIN: tech does it
· Others: skip it or pay someone
At this point, the choice should be obvious
Tech guaranteed in all 48 states
Parts shipped direct — 10-year warranty
Bumper-to-bumper coverage year one
Professional install — no flare, no coil
Looks pro. Works pro. Priced like DIY.
Money-back guarantee if we can't deliver
Every other brand asks you to choose between professional quality and DIY savings. GWIN removed that choice. You get the savings. You get the professional install. You get the certified tech. You get the bumper-to-bumper warranty. You get parts for a decade.
There is no other brand in the self-install space that has solved every problem GWIN has solved. This isn't a close call. This is the only call.
Two single-zone series9k–36k BTU
Down to −22°F
The lineup — single-zone
One room, done right. King and Emperor.
What is the difference between the GWIN King and Emperor single-zone systems?
A single-zone GWIN™ system pairs one outdoor unit with one indoor air handler — the simplest way to heat and cool a bedroom, office, garage, or addition. Two series, both R-32, both with a licensed tech included.
King series
King
The Workhorse
The widest range and the easiest install — high-wall, in every size you'd need.
Sizes9k · 12k · 18k · 24k · 30k · 36k
Efficiency
up to 22 SEER2
Heats down to
−13°F
Power
115V on 9k & 12k
Handler style
High-wall
Warranty
10-yr parts · 1-yr bumper-to-bumper
Best for the widest choice of room sizes — and easy 115V plug-in installs on the smaller units.
Full specifications
The King Series is our workhorse model. It has a larger size selection to choose from, but they only come in high-wall air handlers. From 9k and 12k 115V to 9k–36k 230V. They have a little more pt-per-hour dehumidification than the Emperor. The King is a little quieter on the top end, where the Emperor is a little quieter on the low end.
Heats down to
−13°F
Refrigerant
R-32
Air handler
High-wall only
Efficiency
19–22 SEER2 (9k–36k)
Airflow (CFM)
159–677 (9–24k) · 36k: 794
Dehumidification (pt/hr)
1.69–5.28 (9–24k) · 36k: 7.40
Sound
24–51 dB (9–24k) · 36k: 52 dB
Sizes
9k · 12k · 18k · 24k · 30k · 36k
115V options
9k & 12k available in 115V
Voltage range
187–253V variance
Includes
Assisted DIY™ — tech included
Warranty
10-yr parts & compressor · 1-yr bumper-to-bumper labor & refrigerant
Features
Indoor auto-clean
WiFi
Low-voltage start
Self-diagnosis
Indoor leak detection
Anti-mildew
I-feel function
Freeze guard
Turbo mode
Smart pre-heat & defrost
Basepan heating
Power factor correction
No dirty-filter alert (Emperor only)
No humidity control (Emperor only)
Emperor series
Emperor
The Flagship
Premium efficiency, the coldest-climate heating, and every handler style.
Sizes9k · 12k · 18k · 24k
Efficiency
up to 26 SEER2
Heats down to
−22°F
Sound
as low as 20 dB
Handler styles
High-wall · cassette · console · ducted
Extras
humidity control · filter alert · turbo
Best for maximum efficiency, the coldest climates, the quietest rooms, and any install style.
Full specifications
The Emperor Series is our flagship single-zones. They come in multiple air-handler types — high-wall, slim cassette, 4-way cassette, compact console, and hidden ducted. They are better in cold temperatures, with a better SEER rating. They provide a little more airflow, and are quieter on the low end, whereas the King Series is a little quieter on the high end. The Emperor also has a dirty-filter alert and humidity control.
Heats down to
−22°F (colder)
Refrigerant
R-32
Air handler
Multiple types
Efficiency
24.5–26 SEER2 (high-wall)
Airflow (CFM)
194–736 (9–24k)
Dehumidification (pt/hr)
1.69–4.23
Sound
20–58 dB (quieter on the low end)
Sizes
9k · 12k · 18k · 24k
115V options
None
Voltage range
187–253V variance
Includes
Assisted DIY™ — tech included
Warranty
10-yr parts & compressor · 1-yr bumper-to-bumper labor & refrigerant
Features
Indoor auto-clean
WiFi
Low-voltage start
Self-diagnosis
Indoor leak detection
Anti-mildew
Dirty-filter alert
I-feel function
Freeze guard
Humidity control
Turbo mode
Smart pre-heat & defrost
Basepan heating
Power factor correction
Both series include: R-32 refrigerant · WiFi · indoor leak detection · self-diagnosis · freeze guard · Assisted DIY™ tech included · 10-yr parts & compressor
2–6 zones18k–60k BTU
Mix & match handlers
The lineup — multi-zone
One outdoor unit. Up to six rooms.
How many rooms can one GWIN multi-zone system cover?
The GWIN™ 22 multi-zone system runs several indoor handlers off a single outdoor condenser — so you can condition the whole house room by room, and mix and match air handler styles to fit each space.
2–6
zones per system
18–60k
condenser range
18–20
SEER2
−22°
cold-climate heat
Mix and match your air-handler styles
King high-wall · 7k–36k
King high-wall
The widest size range, with quiet operation, leak detection, self-diagnosis, WiFi, I-feel comfort, and dehumidification.
Emperor high-wall · 9k–24k
Emperor high-wall
Everything the King offers, plus even quieter operation, a little more airflow, dirty-filter alert, and humidity control.
Ceiling · low-profile
Slim ceiling cassette
Low-profile ceiling mount that delivers powerful, even airflow while staying discreet and out of sight.
Ceiling · open spaces
4-way cassette
Ceiling-mounted, distributing conditioned air in all directions for balanced comfort across larger open spaces.
Low-wall · floor level
Compact console
Versatile low-wall handler designed for spaces where wall or ceiling installation isn't ideal.
Concealed · ducted
Hidden ducted
Concealed ducted air handler that delivers whole-room comfort through ductwork while keeping the equipment completely out of sight.
Every multi-zone system: R-32 · basepan heating · smart pre-heat & defrost · low-voltage start · self-diagnosis · Assisted DIY™ tech included · 10-yr parts & compressor · 1-yr bumper-to-bumper
Central ducted · whole home
THE LINEUP — central ducted
Max home comfort, for extreme weather climates.
What is a GWIN Max 22 central ducted mini split system?
The GWIN™ Max 22 central ducted heat pump system delivers max home comfort in all climates. Tight spaces, multiple mounting positions, extreme conditions — no match for the Max 22. Our powerful multi-position air handler sends conditioned air through ducts to every room, sized 18k to 60k BTU, with a licensed tech included on every system.
2–5 ton
whole-home range
19
seer
−22°
cold-climate heat
Why central ducted
Extreme climates
Max heating down to -22 with 100% performance at 5° — Powerful cooling up to 129° while providing 100% performance at 115°
Completely versatile
Mounts in tight spaces, as an up flow, down flow, right flow, and left flow — perfect for new construction, and replacements. Duel fuel compatible.
Real life features
Auto Clean, I-Feel technology, dehumidification, self-diagnosis, leak detection, base pan heating, low voltage start, and power factor correction.
Every Max 22 central ducted system: R-32 · concealed ducted air handler · multi-position install · self-diagnosis · Assisted DIY™ tech included · 10-yr parts & compressor · 1-yr bumper-to-bumper
Same DIY savings
Tech + warranty standard
The value comparison
Comparable price. No comparison in result.
Is GWIN worth it compared to the leading DIY mini split brand?
Some brands charge less and hide a professional install requirement in the fine print. The most recognized DIY brand charges about the same as GWIN. But same price doesn't mean same value — not even close.
Cheap DIY brands
Budget DIY
Lower price
Requires professional install in fine print. No tech. No real warranty. No parts network. You pay less — until something goes wrong.
Leading DIY brand
Most recognized DIY
~Same price
Pre-charged lineset. No tech. Basic warranty. No parts network. No bumper-to-bumper. You're on your own from day one.
★ GWIN
GWIN Assisted DIY™
~Same price
Tech included. Bumper-to-bumper year one. 10-year warranty. National parts network. Professional install. Everything the others aren't.
Category
Leading DIY brand
GWIN
Price
Comparable
Comparable
Tech included at install
Never
Always — guaranteed
Refrigerant type
R-410A blend
R-32 — single component, more efficient
Cold weather heating
Rated to -13°F
Rated to -22°F (multizone)
Year one coverage
Basic parts only
Bumper-to-bumper
Parts warranty
5–7 years
10 years — fully transferable
Parts availability
Find your own source
National supply house
Lineset install
Pre-charged — coil excess
Cut to length — no oil trap
Vacuum pull at startup
On you or skipped
Tech pulls it every time
Ongoing service access
Find your own tech
GWIN network for life
Warranty transferable
Often voids on resale
Follows the equipment — always
Tech guarantee
None
Money back + keep equipment
The verdict
Same price. GWIN wins every single category.
This isn't a close call. At the same price point, GWIN delivers more tech support, better equipment, a stronger warranty, longer coverage, and a professional result — in every measurable way.
Buy direct
Ships to 48 states
Ready to make the move?
Buying a GWIN™ system is refreshingly simple
How do I buy a GWIN mini split system?
You've made the right call. Here's exactly how it works — from choosing your system to your first cool day.
You're buying direct from the manufacturer. No middleman. No markup. No third party between you and the people who built your system. We know you, we know your order, and we're here every step of the way.
Step 1 — Choose your system, your way
Option A
Use the calculator
Tell us your rooms and sizes. It builds the perfect system for you automatically.
Option B
Use the builder
Know what you need? Pick each piece yourself and assemble your system your way.
Option C
Shop by category
Browse complete systems by type, size, or configuration. Find what fits your space.
Option D
Talk to our team
Skip all of it. Call our in-house staff and let us figure it out together.
Step 2 — From purchase to startup
Purchase
You place your order
Direct from us. We know you and your order from the moment it's placed. No intermediary, no confusion, no runaround if you ever have a question.
Delivery
We ship it out right away
Free shipping, no delays. Your system heads to your door. We'll prep you on everything you need to know about the install so you're ready when it arrives.
Install
Install on your own time. Zero pressure.
Take your time. Do it on a weekend. Do it in stages. Our team is available to answer every question along the way. There's no clock running and no deadline to stress about.
Startup
Ready? Just call us.
When you're done with the install, give us a call. We communicate directly between you and the tech, get your startup scheduled, and take care of everything from there. You don't chase anyone down. We do it for you.
We get to know you
You're not an order number. You're a customer we want to keep for life. Our staff knows your system, your situation, and your name.
Real humans, real answers
Questions about install, sizing, the tech visit? Call us. Local in-house staff who actually know HVAC — not a call center script.
Ships fast, ships free
No shipping fees. No slow boat. We get your order out quickly so you can get moving on your timeline.
We schedule the tech for you
You never have to chase down a contractor. When you're ready, one call to us and we handle all the coordination.
That's it. That's the whole process.
Choose your system. We ship it free. You install it on your time. You call us. We send the tech. Your system gets certified, your warranty activates, and you're covered — for the next decade.
Free tech, guaranteed
Scheduling your tech
Install on your own time. Tech scheduling is on ours.
How does GWIN schedule the tech for my install?
Get your system and install it on your own time, with no rush from us. When your system is completely installed, you simply contact us, let us know you're ready for your tech, and we handle the rest. We'll reach out to your tech and get everything scheduled for you. It's that easy.
Install on your schedule
Take the weekend, take a month — there's no clock. Finish the install whenever it suits you.
Tell us you're ready
One message — "I'm ready for my tech." That's all it takes to start scheduling.
We schedule your tech
We reach out to your licensed tech, lock in a date that works for you, and confirm it. Done.
You never chase a contractor
No cold-calling strangers, no being put on hold. One message to us and we coordinate the entire visit for you.
A licensed, certified pro
Your tech is a licensed, EPA-certified professional who leak-tests, pulls the vacuum, and commissions your system right.
Zero pressure, zero clock
There's no deadline to schedule. Your tech and your coverage wait for you — install today or three weekends from now.
Covered if anything's off
If the tech finds an issue — or misses one — we fix it free under your first-year guarantee. You're never on the hook.
That's the whole point of Assisted DIY™.
You do the part you can — on your time. We send a licensed tech to handle the part you shouldn't, leak-test it, and certify it. And we stand behind all of it. No chasing. No guessing. No risk.