DIY Multi-Zone Ductless Mini Split AC & Heating System | MR Cool Install 2021

How to install the MR COOL DIY Multi Zone Ductless Mini Split unit. I took out the old Window Unit poking through my wall and replaced it with this efficient new system with 2 air handlers. Is it worth it???

Materials and Supplies:

Some other videos that helped:

This installation was surprisingly easy. I've seen quite a few tutorials showing how to install a mini split system like this and having those resources were really helpful to me.. .not to mention getting help from Josh and Jeremy. I would totally recommend a DIY mini-split installation rather than the cost of a traditional HVAC install... and check out the specs on these MR COOL parts I used.

[jeremyh]

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

[ebonijohnson]

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

[wwgbert]

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.

[gratitude]

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.

[robertberin]

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

[parzdiver]

“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!

[mattsbrute]

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.

[ModernBuilds]

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!

[damanorelse]

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

[hansarbelaez]

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

[justinc.]

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.)

[DrDonO]

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

[iKarrott]

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

[misdemeanor]

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!

[TJCooney]

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

[rapturebound]

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. 👍

[TheHarryChanne]

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.

[simonking]

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.

[jessegandarilla]

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!

[tangoseal]

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.