New Sizes, New Warranty, New Specs, New Cable

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Patented Easy DIY® Installation

Our Patented Easy DIY® Installation

Easily install the MRCOOL DIY® using our patented simple mount, connect, and enjoy system. MRCOOL DIY® provides to-the-degree comfort in your space whether you need heat or AC. See our patents Here

- Check out the Install Video here -
Pre-Charged R-410a Quick Connect Lineset

Pre-Charged R-410a Quick Connect Line Set

The included Pre-Charged R-410a Quick Connect Line Set allows anyone to install our innovative ductless mini-split without expensive tools or specialized training.

Control Your Air from Anywhere

Control Your Air from Anywhere

Control your comfort from your smart phone with the SmartHVAC® App.

- Check out the SmartHVAC App here -
Corrosion Resistance

Gold Fin® Corrosion Resistance

Gold Fin® Corrosion Resistant condenser coils for long term reliability - even on the coast.

The new DIYPRO® armored cable

Durability and Safety

The included DIYPro™ Cable eliminates the need for electrical conduit providing higher mechanical protection and durability.

Best Warranty Yet

Limited Lifetime* | 7 Year Compressor* & 5 Year Parts

The DIY® 4th gen Multi-Zone comes with a LIMITED LIFETIME compressor warranty*, a 7-year compressor replacement* warranty, and a standard 5-year parts warranty for the original registered owner. See rules and restrictions here.

Temperature Control
Down To The Degree

Easily control the temperature of your space from your phone or with the included remote control. The temperature adapts based on where you are in the room.

Quick Connect
No Expensive Tools Necessary

With our patented simple quick connect lines, you'll be able to install your MRCOOL DIY® without needing specialized training or expensive tools.

See our patents Here

Mount & Connect
Easy Mount System

Getting your MRCOOL DIY® system mounted and ready to go is a snap away. Using our patented system you'll be ready to go in minutes instead of days.

See our patents Here
limited lifetime warranty
7 year compressor warranty
5 year parts warranty
* rules and restrictions here.

Pick the perfect MRCOOL DIY® for your space


Every space is a little different. Whether your space is big or small we have the perfect MRCOOL DIY® so you can be totally comfortable in your space.

4th Gen DIY  12000 BTU
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Cool / Heat up to 500 sqft.

  • Easy DIY Install

  • 7-year Compressor Warranty and 5-year Parts Warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  18000 BTU
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Cool/heat up to 750 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  24000 BTU
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Cool/heat up to 1000 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  36000 BTU
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Cool/heat up to 1500 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

Need an Option for Multiple Rooms?

Check out the NEW MRCOOL DIY® Multi-Zone Systems

2-ZONE DIY
4th Gen
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As Low As $2,666

3-ZONE DIY
4th Gen
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As Low As $3,641

4-ZONE DIY
4th Gen
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As Low As $4,695

5-ZONE DIY
4th Gen
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As Low As $6,049

Own Your Space
Control Your Comfort


The MRCOOL 4th Gen DIY® has 2, 3, 4, and 5 zone options, the best warranties in the business, even better efficiency ratings and a new armored cable...

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Smartphone App


Control Heating & Cooling from Anywhere

If you have WiFi, you can control your HVAC system from anywhere where you have internet access.
The Best Warranty

The Best Warranty


Limited Lifetime* | 7 Year Compressor* & 5 Year Parts

4th Gen DIY®s have an optional LIMITED LIFETIME compressor warranty*, a 7-year compressor replacement* warranty, and a standard 5-year parts warranty for the original registered owner. See rules and restrictions here.

Voice Controls

Voice Controls


Amazon Alexa & Google Assistant

The 4th Gen DIY® is fully compatible with Amazon Alexa and Google Assistant

Precision Controls

New DIYPRO™ Cable


Safety & Durability

The included DIYPRO™ armored cable is shielded in coated flexible conduit providing higher mechanical protection and durability.

5 zone available now

Now Available


5 Zone Options

Now you'll be able to heat and cool up to 5 rooms at a time with the MRCOOL® DIY® 5 Zone Multi-Zone unit.

Zone Controls

Multi-Zone


One House, One Solution

Multi-zone technology gives you flexibility and control whenever and wherever you want it.

Why people love MRCOOL DIY®

The New MRCOOL DIY Is Engineered For Comfort

No duct work needed.

MRCOOL DIY doesn't require any expensive ductwork. Simply mount, connect, and enjoy.

Degree Temperature Control

Control the temperature of your space down to the degree using MRCOOL DIY's sensor technology.

DIY Install

Simply install MRCOOL DIY without the need for expensive tools or specialized training.

I use it to cool down a 432 square foot living area and from the start up to comfortable cool takes five minutes. I can honestly say it's the best air conditioner I ever installed for myself. I'm 72 years old and I installed it myself.

Johnboy

Let’s compare.


May the best AC & Heating system win.

No Duct Work

MRCOOL DIY® is ductless. This allows you to quickly install the MRCOOL DIY® unit into your space even if you don't have duct work in place. Avoid buying expensive tools and install it yourself.

Requires Expensive Ductwork

Conventional HVAC work requires installing expensive ductwork in your house, and ductwork repairs. This work typically costs thousands of dollars.

Cost Effective Equipment

From the start of your project to cooling your home, we will ensure that you are up and running with quality equipment, great cost savings and minimal effort.

Expensive Equipment & Utility Costs

HVAC equipment is expensive and often isn't optimized for utility costs. Don't be surprised if HVAC equipment runs you into the thousands of dollars even before installation fees and monthly utility costs.

DIY Installation

Simply follow instructions and install MRCOOL DIY® yourself in hours. No need to for specialized training or expensive tools.

Expensive Installation

Installing an HVAC system often requires several days of work and thousands of dollars in professional installation costs.

Why keep scrolling?


Check out a MRCOOL® DIY® now!

4th Gen DIY  12000 BTU
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Cool / Heat up to 500 sqft.

  • Easy DIY Install

  • 7-year Compressor Warranty and 5-year Parts Warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  18000 BTU
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Cool/heat up to 750 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  24000 BTU
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Cool/heat up to 1000 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

4th Gen DIY  36000 BTU
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Cool/heat up to 1500 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

Join thousands enjoying their space in comfort.

Over 1,560 verified customer reviews

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This was the best purchase and project I've ever done

This was the best purchase and project I've ever done! That's why this is the first review I've ever taken the time to submit. Fantastic product - and the packaging was amazing.

Jason W.

Install is a couple of hours, not hundreds of dollars

I own 6 total mini-split units. All of the others I had to pay a licensed HVAC person to install them costing an additional $350-600 per unit. This Unit I installed by myself in just a couple of hours and it was up and running and cooling my shop.

James

Perfection!

I had my doubts about these simple DIY units, but after installing two of them, one of which ran very well for the entire summer, I'm a convert now.

RH Lee.

Your MRCOOL DIY® questions, answered.

What exactly is the MRCOOL DIY®?

A MRCOOL DIY® Series heat pump is the only ductless mini-split system on the market explicitly designed for amateur installation. You don't need special tools or training to install this high efficiency heat pump. The line sets precharged with R-410A refrigerant, the quick hook-up electrical connections, and the quality engineering mean just about anyone can install a MRCOOL DIY® in their home with no problem at all in only a few short hours. If you want great air comfort without paying an arm and a leg for installation, you want an easy-to-use MRCOOL DIY® Series ductless heat pump.


  • Unlike any other ductless heat pump on the market, the MRCOOL DIY® series is specifically designed for easy installation, the MRCOOL DIY® series comes with precharged line sets alleviating 1 major obstacle to amateur installation in a single stroke.
  • 7-year compressor warranty and 5-year parts warranty
  • DC inverter and variable speed compressor technology cuts operating costs
  • Refrigerant leakage detection ensures your system remains operating efficiently without degradation due to undetected corrosion
  • MRCOOL DIY® temperature compensation technology help keeps you comfortable in any weather conditions

Are the indoor and outdoor components included?

Yes, both the indoor wall mounted air handler and the outdoor condenser are included, along with the line set and communicating wire to connect the two units.

How efficient is this unit at low temperatures such as 10- 20F?

So far the lowest temperature that I have experienced with this unit is -7 Celsius which is 19.4 Fahrenheit and it was still making adequate heat but it was noted that there was a reduction in the heat output. You should have a supplemental or backup heat source if you live in an area where you experience consistent temps near or below freezing!

Does the inside unit come with mounting brackets?

Yes, and a nice template to drill the holes for the mounting bracket.

Does the system include the communication wire to connect the indoor to the outdoor unit?

Yes, every MRCOOL DIY® includes the communication wire to connect the air handler, the indoor unit, and the condenser, the outdoor unit.

You’ll spend over 6000 hours in your space this year.
Be Comfortable.

Shop now