Super simple and anyone can do it, all you need is two hvac techs and one electrician.

I've watched a half dozen different youtubers install AC, and I could watch a hundred more.

“I won’t be doing a video because I have no idea what I am doing.” Um... isn’t that what most of your videos are? Love them all!

Heat pumps are the future. Technology Connections would be proud.

I'm about to move into a semi fixer-upper house and these videos are very motivating. Knowing I could get something like this done with little experience and a weekend's worth of work is awesome. Thanks man!

I live in Guam and 90% of the homes are built with split ac units to help keep electricity costs down. I love them!

👍 10:17. Oil is going to pool up because you coiled the excess vertically. You should've elevated the condenser and coiled them horizontally.

This looks great, one tip only, please don't shut off your living room at night to "save" on cost. What happens is the rest of all the mass heats up and the system when you turn it back on has to over compensate so it spikes to get everything to your designed temp. Trust me on this one, either you really want a system that runs like a "taxi" or one that runs like a car on the highway. Taxi's start and stop, highway driving will always be better milage and WAY LESS ware and tear. I really do hope you see this, I have been doing this HVAC / building science for 20 plus years.

I like the rough texture of the cement pad! Great job on everything, looks great. Thanks for the video!

I am definitely going with a Mr. Cool system. I own 2 homes that I am remodeling and I've decided the mini-split heating & AC units are the way to go. I like the flexability of controlling different zones of the house separately. Thanx for the installation video..I have watched several of them on the mini-splits and yours was very well done. 👍

3:19 "no idea what i'm doing" -Those are the best videos!!!

Place rubber absorbing pads under the outdoor unit feet before screwing to concrete. Helps absorb vibration and stop concrete rusting the feet over time. These have been the staple air-conditioning systems in Australia for decades. nice to see the USA catching up.

I did a multi room unit in northern California, it was awesome, the dehumidify really was all I needed 90% of the summer it was great to have the option to keep rooms at different temps. (one thing to note is you cannot mix heating and cooling a the same time.)

I just installed mine in my living room last week. I now have to install my multi-zone ones throughout our bedrooms. This video was super helpful because I wasn't sure how to get one of the air handlers in one of the rooms because there isn't enough room on the exterior wall(giant window). Your video showed something the rest of the videos haven't, and that is bending the lines of the air handler the opposite way they came in. I did not know you could cut out that plastic piece if you needed too. This was amazing to know. I am less stress and more confident in doing this. You have a new subscriber!

this is somehow my 6th UKpostsr to put in a split ac. and I watched all of them theses arnet even informational anymore I'm just enjoying the show

the gravel and wooden frame is a great touch. As a landscaper it's always a much easier job to maintain the lawn near the hvac systems that have been designed for not just aesthetics but practicality and safety. good job

Big upgrade from the window unit I used for the last couple months of summer last year. Mini-split units are becoming more and more popular and I wanted to see what all the hype is about.. definitely way more quiet and convenient, plus it heats as well as cools. I'll post an update after this summer to talk money and savings! What kind of savings have people seen switching to ductless systems?? I'm curious to compare!

I was seriously surprised how nice you dressed it up. if that was in my front yard I wouldn't mind

Using the draining water from the indoor units to water plants is an amazingly smart idea

"... I probably won't do a youtube video because I have no idea what I'm doing..." Aw - those are the best videos! Nice job. Minisplits are indeed very nice. If you live in an area with high humidity there is nothing better for dehumidification since the vast majority of them are variable speed and they can optimize for dehumidification.

It's also worth mentioning, code in some areas will require in offset from the property line. It's not worth risking a notice from the city telling you to move the unit, so check your local regulations.

Been wondering where you've been. Love your videos!

omg you have emboldened my husband and I! I think we'll try this!!

Wow having the condensation water plants is sooo smart makes me want to try that at home

Just to clear up the never ending question I keep seeing. I've installed both styles. DIY and standard mini splits. The DIY units have Freon pre charged in the lines with sealed connectors. The vacuum is already pulled on the compressor side. When you open the valves where the lines attach to the outside unit it draws the Freon in from the pre charged cooper lines and your done. Run unit 5 mins in heat and cool cycle and your good to go. The standard units have Freon already in the compressor side but the copper lines have to be built so they will have air in them. They need to have a vacuum pulled and you need the little special connector to attach your gauges. Its like $12 I think. Your pulling the vacuum on the lines and inside unit for I think 30 mins at whatever pressure. The inside unit will make a little hiss sound when you take the caps off which is good. They pull a draw on it and the hiss means it has no leaks. I don't remember exact numbers but its in the book. AC guys know off top they're head. The DIY units have worked perfect for me so far after a few years. The standard units have been perfect also. There is no difference in the cooling abilities between them.

I installed MRCOOL mini split units (1) 24k and (2) 9k and I cannot be more happier, this last winter I use way less oil and compare with the electricity used i got big savings, now in the summer I’m using so far the dry mode and it cool all the areas so easy, super energy efficient machines, but I think by getting the units separate will save you more than having a multi zone condenser for all the air handlers, individually you get more seers but Multizones less seer therefore less efficiency and more power consumption……overall great investment

The MrCool units are top notch. Just make sure you dont put any additional pressure on the lines when installing to the condenser (the outside unit with the fan). I have 2 of them and couldnt be more happier. Plus the super efficiency is a bonus as it saves me tons on my electric bill . Overall great video!!

I remember back in the day (on the Modern Maker Podcast), you'd mention that your long-term dream was to take on a bigger project, like a house. It's crazy to see that come true! Great content, as always, and killer edits! (still watching the video, just wanted to get my comment in early, haha).

DIY as long as you have some HVAC tech’s with you

A) Cool Air provides rubber dampening pads for each of the four corners wear you bolt it down. They should have been used. Vibration on that hard pad will be tough on the unit. B) You can't water things with the condensation. The water is full of impurities and can kill plants. C) The key to this install was the great electrician.

Your videos are great, wish I had the confidence to tackle projects like these myself lol.

Good job dude. I'm getting now. Been waiting for a multi zone unit

Great video Mike, I think the concrete pad looks fine being un-troweled. Nice work on the install.👍

Finishing TIP for m.split installations: When finished, PAINT to Match = Paint all your 'additions' attached on the exterior wall(s) using same-color wall paint of your house. Then they will blend in so that exterior wall will look a great deal less industrial. Include painting: LineSet Covers, conduit and disconnect box... can even paint wiring. Note that the gray on the disconnect box is gray PRIMER paint - these are meant to be 'painted in' in order to match surroundings. (Same is true for your inside Circuit Breaker Panels - no reason to leave them gray in the middle of a white wall) -Cheers

Dude, this set up was really slick, thanks for sharing.

The only thing you are missing is a surge protector for your minisplit. You should install a Ditek DTK120/240 surge protector on your cutout switch so that in the event a lightning strike or power company surge happens your sensitive electronic control boards in the minisplit aren't toasted.

I realize not every tiny step is filmed- did you air-seal the interior holes in the wall and water-seal the exterior holes under those flanges?

Nice work on the install Mike, looks great! 👍🏽

Thank you very much for your time and posting. Great job. I haven't decided on two 12K BTU systems or one 24K BTU 2 Zone system for a mobile home w/ 840 sq. ft. Thanks again.

Awesome video. My OCD now needs the follow up video where you repaint the wall and patch the outside stucco lol

"DIY." Guy hires an HVAC company to do the entire install.

My Mr. Cool mini split is going on 2 years strong, not a single problem with it. Solid unit for heat and A C.

Great job as always Mike. Please do share with us the energy comparison after the summer. I am very interested. We have a large famiy room addition and since we are on a slab there isn't any ductwork for heat or AC. We have an old stand alone heater and have lived without AC in that room since we bought the house 3 years ago. One of these Mr. Cool units might just be the ticket. How is the finish on the tub holding up?

great video. One of the best I've seen about mr. cool.

I'm excited to see how this build holds up, and the savings it could bring you! The simplicity of install seemed so well designed, and I will definitely be checking out this company. One thing that concerned me while watching your testing of the connections with snoop (soapy water). It's fine when those lines are positively pressured like they were, but if you ever run into issues and are troubleshooting the unit, be sure to never snoop a section of refrigerant line you have a vacuum on. If you have a leak and the line is negatively pressured, you'll ruin (and need to replace) the filter dryer, and could possibly corrode the inside of the tubes and damage the compressor. Anyways, great video as always, and I hope that you do show the stucco work!

Here’s a tip on the concrete: after about 2 hours setup time on a pour the size you did, use a rasp to knock down the rough spots and essentially you have a smooth sanded finish before it hardens. Use a level to span across the forms as you go to check for high spots. Sweep off the dust when it’s cured. Good to go.

Great video glad you posted been waiting

Mike, LOVE the intro music!

I hope you decided to record the patch job. We wanna see it

I know you had some Pro's come and help you but just a couple things to keep in mind (From another Pro) - Those communicating and power wires to the head unit are not UV rated, you really want to run those in some type of shielding (i.e. Sealtight or Liquidtight) - Those temp guns measure surface temp, not air temp, which is different and key when trying to gauge a true temp split. - Hooking up gauges to mini-splits to assess sub-cool and super-heat is pointless unless the system has a "charge" mode which can be enabled to force the system into 100% capacity One of the reasons these inverter mini-splits are so efficient is because they almost NEVER run @ 100% capacity. And if it's not then you have Accumulators and or Receivers that store refrigerant and release it back into the appropriate circuit/ working in conjunction with the metering device (Usually an EEV) to maintain a target SH. These systems seldom run long enough, and at a consistent enough capacity, to accurately read SB or SH. This is why a lot of the ductless mini-split systems don't even have a high side service port, just a low side to add refrigerant, which is only necessary if the line set is over a certain length, and in these cases, the added charged is calculated and weighed in via length of line set. ** I say high side (Discharge) and Low Side (suction) out of habit. On this system the EEV is in the condenser so both lines are technically "Low pressure" (This is why both must be insulated) But as a reference point it serves its purpose. ** On a side note, please do a one year update! I only ask because I myself have replaced at least a half dozen of these MRCOOL with name brand ductless mini-split systems do to these MRCOOL's failing. All for loss of charge, but in different areas of the refrigeration circuit.

Those yellow magnetic stud finders are the best. Cheap an effective

very nice , I am ready to do this on my guest house .thanks for the video.

Awesome project, Mike! Quick question: didn't the unit come with rubber feet to decrease transferring vibrations and noise?

Maybe prime and paint that exterior white plastic conduit when you patch the stucco?

Excellent! This will solve an issue for me!

Great video, great info and clean install.

Is this the dude that did the attic theater room build where he dry walled over a window?

Bob: What are you doing in my house? Also Bob: Cool dog

Omg you've reached 1.5 mil already??♡♡

I hope this comment isn't misunderstood as criticism but if I can make a suggestion - put "install" right after "DIY" at the start of the title so it says "DIY install Multi-Zone Ductless Mini Split AC". I definitely don't believe you were trying to clickbait or mislead with the title, but I was definitely expecting a very different video. However, it actually worked out for me as I've not really looked into many ready-made ductless mini-split systems in my quest to convert a window-mount AC into a mini split. I've only really looked into videos of other people that did the same - which I now see was a mistake. There's a lot more optional features for mini-split systems than I had originally assumed... I guess that's why there's such common sayings regarding making assumptions... So, thank you for that. Take it easy...

Do not spool refrigerant lines in a Vertical plane, the lubricating oil will eventually get trapped in bottom of Suction loop,. compressor will stave for lube oil. make loops in Horizontal plane so oil can keep flowing.

Missed an important step on the video: when you open the valves to the line sets you must ALSO open the master valves located above all of the places where the zone line sets connect on the outdoor unit .. do this prior to turning on the unit. Otherwise a great video.

Who saw all the new videos coming later from this channel in the whiteboard 😎😎😎 excited

@Modern Builds, you should definitely do a stucco video. You can show how to DIY.

The theory behind the mini split is slow constant airflow. So turning them on and off will actually make them less efficient. Running them slow and constant is the key to efficiency.

I’m interested in what the electric bill is going to be as well.

TURNED OUT 🔥🔥🔥🔥🔥🔥🔥🔥

Could use the hole for a window instead of a stucco patch? Depending on what it’s facing can let a lot of natural light in

my dude im not hating .... but i dont think u need all that rebar ??? lol

5:34 Square to the earth? Square. To. The. Earth? I’m sorry?

This is awesome and the funny part before I wacth commercial of mr. Cool

Great job mr cool,i always wanted to installed a full wall unit in my home,but can't find the correct person or company.

there is a tool that lets you make flare fittings so you can cut the copper to the perfect length so you dont leave it bunched up and create an oil trap that is bad for the unit. surprised the HVAC techs didnt have one....

It's hard for me to be sure without being there but I'm 95% positive you have a Zinsco electric panel and if so, it needs to be replaced if you want to avoid an electrical fire...

I saw ur ad on UKposts it was cool i gave it a thumbs up . 😁

Nice work Mr Cool 👏

the electrical cables that feed the system were very very badly installed, you can see they cut cables to reduce the diameter so each cable can fit in one side of the holder, bad method! you can use an electrical terminal and use the full diameter of the cable and reduce the heat in the cable and consume less energy.

Those loops in the line are going to act like traps and trap the oil in the system

Great job! Liked a lot the condense outlet. What for is the white hanging cable in 8:33? Seems obsolete. Still visible after finishing touches.

Very nice setup! Good instruction video

It’s been a year since posting this video. Any word on the electricity bill? I’m considering getting a couple of these for a house remodel. Very little to no snow in my area but a lot of great comments of things to keep in mind, mainly have an HVAC guy handy and don’t leave extra line coiled up. But, I’m very interested in how this impacted the electric bill. I can’t find anyone that has one who shared the difference it makes on the electric bill, good or bad.

FYI, you can’t use pressures on these systems. They’re critically charged. It will give you an idea but keep in mind everything modulates according to the load.

I was wondering where you’ve been hee hee. But I keep seeing you on adds here on UKposts. This is great if I needed AC this looks doable.

Very nice and clean work !

Points the laser thermometer at the AC to determine how quick it’s cooling the room 🤔

if mrcool wants to send me one for free id be happy to do a video for them as well.

Hi, this looks great. Do you know, can this outdoor unit be placed higher than inside units??

I just saw a home Depot ad with you in it xD

Some of the electrical connections at the Condenser Unit looked like they could’ve been done better and I would’ve foamed the wall penetrations to avoid critters and better sealing but other than that these DIY A/C units look like a good option for a Garage. If it breaks in 3-5 years who cares.

Didn't talk about sizing?? Can't just throw in a AC system with out sizing it correctly I get the precharged linesets but alot of manufacturers of "duct-less" have minimum requiments on line set length, coiling the line set like that in the back is incorrect an is NOT recommended by any manufacturer that I've seen, creates a oil trap. Also the box he built is not recommended beacuse most manufacturers have distances requirements for the outdoor coil (condenser) Also, no torque requirements on the lineset connections? No feet for the Outdoor coil? All heat pumps must be raised tobe drained to prevent ice daming in winter. Also, No surge protector on the disconnect? Would be nicer if it was on the other side of the outdoor coil but hey you have one. Do not install this yourself, call a HVAC pro, get 3 different bids and don't go with the lowest one. Plus most HVAC pros have warranties. But hey that's a sweat condesate drain...

Looks great! I'm interested in the stucco process, may be you could do an IG story on it?

Very nicely done. Thank you!!

Anyone excited for his UKposts Roadmap teaser on his whiteboard? 😂

These units still need to be vacuumed by a professional. You can use the precharged lines but it lessens the life.

Can you keep the two rooms on different a/c settings……. One at 75 degrees and the other at 79 degrees?

Great video. You had two units. How many sq ft did this serve? Is the condenser unit outside very loud?Thanks for the information 👍

Lmaoooo "this much water will never come out of this system so its fine" one humid day is all you need.

It’s really not the best idea for your line sets to be coiled in the upright position… all of the oil will drain out of the compressor and get trapped.

Awesome! I see you using The Studbuddy! I work for them and probably shipped that studfinder to the Home Depot you bought it at!

Great video. I wanted that AC unit in my apartment but I'm on the 3rd floor