10 Min. ReCharge MrCool DIY 

This kit was a life saver! Brian was so quick to email back and the video was perfect for a step-by-step guide. I actually used this on my camper’s unit which did have a refill port. Mine did not require the adapter, but I had everything I needed. It was easy to do and I plan to buy another kit to recharge my Mitsubishi split unit! 10/10 recommend. Last week’s camping trip was nice and cool!

Great video! I had no experience with mini-splits, but just bought a house filled with them. One of our units was not working prior to moving in, and of course it's in the room that's 75% windows and in Texas and in the summer. I watched this video and did a decent amount of research, and decided it was worth it to risk the price of the kit even if it wasn't the solution. When the kit showed up I quickly learned my pipe configuration was different than the video. I sent a couple of pics in an email and Brian responded almost immediately, and within 10 minutes I had cold air blowing! The kit barely costs more than many techs will charge just for diagnostics. I could not be happier that I stumbled across this video. Thanks, Brian!!!

Super helpful video. I ended up buying the refrigerant from Brian. He always responded to my emails extremely fast. After I had some additional issues unrelated to refrigerant, he was more than happy to talk to me on the phone and offer his professional level advice. Thanks Brian!

This kit works! I admit I was a bit skeptical whether it would fix the low refrigerant problem in my Mitsubishi mini split. I'm happy to say that I had zero problems using the recharging kit and my air temperature went from 61 degrees to 49 degrees. Anyone that's even a bit "handy" can use this kit without issues. Thank you Mr. Niskala for this video and your money saving kit!!

I just had a wonderful experience with Brian. He took time out of his day to allow me to ask him some important questions, Thank you Brian, you are awesome!

Worked perfectly, spoke to Brian and he walked me through it. Saved me a lot of money. Thanks

Bravo. My 3 ton unit had been running great for about 3 years but has been struggling a lot these last 5-6 months. It was definitely on the low side and your kit and instructions were easy to follow and got the unit working great again. I'm on the hunt for any leaks now.

Finally got it up and running. The only delays we had was because we realized we needed some extra parts (I’ll list that below) ru-vid.comUgkxihMYiJNXcHdbH-7ihymsLz61l7jVyb5O . So we have a loft where our current hvac just couldn’t seem to keep cool during the summer. We have been using a window unit since we bought this house over 6 years ago (all the houses in this neighborhood were built in the 80’s and majority of the houses built like ours use a window unit). I hate window units because they are just so noisy and the one we had really only cools one side of the loft. I had contemplated upgrading our current HVAC, but with all the rising prices these days, it would take years before saving up enough to do that. With the advice of my father-in-law (used to run an HVAC business), he recommended we get an inverter instead. We thought we bought everything we needed, but there were just a few other parts we didn’t anticipate needing (which is what caused most of our delay). My friend and father-in-law did all the work to get it installed and running and now we have nice cool air circulating nicely throughout the entire loft. It is very quiet and even the outside unit is much quieter than our main HVAC unit. Saved ourselves thousands getting this.

I just ordered and got one of these for my mr cool universal. I was not getting much heat. This did the trick. Shipping was super fast and sameday!!! Just goto the website in the description. Try this before anything else. If your heat pump is running more, then it should! Thanks Brian!!

Awesome Product! Had a question and Brian responded withing minutes. Works exactly as described. Thank You.

I just ordered and hope it makes a difference on it. Thank you for your help and support.

This fix was spot on for me. Unit was displaying PC03 error. I had some trouble at first (all user error), emailed and received a text and a phone call. Brian was super helpful and walked me through the process. Thanks Brian!

Bought this kit and it worked as indicated in the video. Would highly recommend for the Mrcool diy mini split!😊

Thank you for this video and for your recharge kit! I just received mine yesterday and it literally only took 5 mins to charge it up. Output temp was 78° and after charging dropped to 55°! Shipping was super fast too.

Awesome! Helpful and informative, thanks.

Worked on my unit a 12K btu single head senville. Not sure where or what leak was, but started to produce heat like it should. Took whole bottle. I checked pressure on unit after charging and it was right where it should be. Will see how long unit continues to run and recomment if need be. Fittings at compressor were all good, no leaks. Did not check flares and connections from the head unit connections with the line set. If it looses charge will take apart cover and insulation and check for leaks. Unit was originally pressure tested and nitrogen purged when installed. Fittings were all good. If it leaks again might be coil in head or compressor unit. Hope sealant did it’s job. Set to 85 F and unit was putting out 109+ degrees, when set to 70F put out around 88 degrees.

Just got my recharge kit from Brian. 100% vouch for this guy! Fast shipping, followed the instructions, my Mr. Cool is Mr. Awesome Cool now! Worked like a charm. Thanks again!!

thank u for a great product!!! fast shipment and instructions were very easy!!!

Just ordered, thanks!

Just orderd the kit! thanks!

Very nice of you to make this kit. Honestly though.. who would want to heat their house to 86 degrees?

I ordered this item from him. Huge help. Thank you very much! And thanks for the fast delivery.

Hi Brian! Thanks for the information, video and service you provide. Just placed an order yesterday because sure enough, my mrcool diy system was on the low side. Thanks again!

Thank you Brian, I ran into some problems emailed Brian and he helped me right away instead of emailing me back he had me call him! Thank you again Great guy ! very helpful

Just ordered a couple of minutes ago. Should work.

Thanks Brian. Great video!! I am installing a Mitsubishi mini split but because of line lengths I may have to add more refrigerent. Just a couple of questions before I purchase. What do the dial colors mean. Are they pressure? Also I dont want the dye. Can I get a kit without it? Thanks for your help. Derrick Willmott

How did you insure that air & moisture was not introduced when attaching the hose & fittings?

So you only opened the port, but didn't check any of the connectors. My concern is if it's that low, and I think mine is in a similar state, that it's leaking somewhere? Or does it just eventually get low? Thanks!

Worked thank you

Would it be possible to "T" into to the hose to hook up a vac pump to evacuate a line first before charging? Basically I'm wondering if something like this could be used to fill a non-precharged DIY line if I pulled a vacuum (with proper hvac pump) before charging?

I have the same unit. It cooled great then during fall it won't heat the garage and doesn't blow hot air. The suction line is hot,filters are clean and no freezing up. Any ideas? Suction pressure during heat mode is 150

This is an awesome video thank you so showing us! Question: I didn't have any leaks when I hooked up my 18K Mr. Cool, but I"m wondering how full they really ship them since it's a DIY. I'm interested to see if it's just slightly low and a little add of freon would make it even better of an AC unit. It cools nicely now, but if you hit about 110 degrees outside and the garage starts to get hot it does struggle a bit. I do have to admit, this is one nice unit Mr. Cool sells. Anyway, what do you think about adding a little to just a normal DIY install to get the maximum cooling effect?

Very helpful video and kits, not just for topping off over time, but also for folks who, um...well...screw up. :) The UV pen is very handy for diagnosing where said screw up is, too.

Just purchased the recharge kit from your comutrader store. Looking forward to seeing how it does

Great video - thanks! Question: I have the Mr Cool mini-split that comes with the pre-charged lines - can that recharge kit be used with this system or do I need to get a different recharge kit?

thanks for the video. I screwed up when I installed the mini split and didn't get the lines vacuumed before I released the refigerant. the mini split worked for about 2 weeks and now it's making a clanking sound on the outside unit. I'd like to get the mini split working. I was thinking I would need to vacuum out the lines correctly this time and then add refigerant. Does that make sense? If I hook up the vacuum correctly this time, will it just suck out the refigerant? Is one of these bottles enough to fully charge a mini split? Thanks in advance.

How much capacity does this canister have? I need to add 2.7 OZ for an additional 9 feet of line-set than what was included with my unit.

Nice job

wouild i be able to tell with your gauge whether or not i have positive pressure and do not need to have lines vacuumed? or do i need a full gauge set to verify? I have a mr cool diy 24k and if totally empty will one bottle be enough?

I purchased your kit this Monday, received in TWO days....thank you!! The gauge on my unit was barely registering when hooked up to my Mr Cool unit and it took the whole can of R410A to reach approximately 60 to 70lbs. Is this common? Also, my charge port was on the lower refrigerant line....I have a 120 volt unit. This may be useful to your subscribers to be aware of. It was the only refrigerant line with a charge port. I just ordered another can to top it off from your website. Thanks again!

Everything about my Mr Cool looks exactly like yours, except for the line connecting the adapter to. My unit connections into the side are reversed to yours. The connection for connecting the R410 can is on top, just the reverse position of yours. Is it possible my unit is hooked up incorrectly? I purchased one of your recharge kits but do not want to use it until I am sure the connections are correct. Thanks, Dan

I have multi zone 3 unit, there two main valve on top, do I charge from the main valve or to the individuals unit line? My unit heats but would stop and turn on continuously. Will This fix the problem?

I have a four zone MrCool. I am unsure which of the lines I would connect your charging system to.

Can I recharge a universal mrcool with it? Is the air in the blue hose a problem? Thanks for a good option!

Will this work on a Mr 4 zone? One of my Zones makes a strange noise everytime the compressor kicks in, the air handler makes a ocean wave sound that last about a minute. It cools the room and all but I’m afraid I might have a leak somewhere or I might be low on refrigerant. Mr cool is well known for shipping the pre charged lines empty I have heard. Will this help.

Brian, thank you for all the helpful advice and this tutorial on how to use your recharge kit! worked great and shipped quickly! I highly recommend this kit👍 Can I use the gauge over again to measure my other minisplits? is it possible to order just the freon and reuse gauge?

Did you have to pull vacuum before using this kit? I just installed the Mr. Cool. One of the pipes was kinked during initial install. I replaced the line set but heard that I was probably going to have to recharge the unit. Have you ever had to pull vacuum to recharge your Mr Cool DIY?

My mr cool unit isn’t as cold as it was the first time I got it. It’s been a year now and it’s cold but not as cold as before. Will this kit help me recharge my unit??

What temp gun are you using? I’m buying a Mr. Cool DIY for a reptile room and that gun seems very accurate.

Anxious to get mine. But mine is a multi zone LG system with 4 indoor units. Can I still use this kit when I get it?

THANK YOU!!!!!!!!

Thank so much for this video! I have a fugitsu unit that was installed seven years ago. I'm getting an A1 code. (about once every other week or so) Everything I can find on the internet points to a low charge. So I think this kit is perfect. Is your Kit pre-blended with with UV Dye & Leak Sealant? And how important is that?

I just did this on my unit. I have two service ports one liquid (smaller) and one gas (larger). As soon as I plugged it in the gas line, the PSI was off the charts, beyond red, but the air is not cold. Any ideas?

I have a Mr Cool 12k, been in for almost 2 years. Started to ice up and not cool. Here on Florida in a carriage house with a tenant. Can you buy these locally?

Great video! I have Mitsubishi Mr slim. I assume this will work with it as well? I had this charged about 5 years ago after leaked down. They never found a leak. I guess it’s time for another recharge.

Just installed a new air handler and had to disconnect and reconnect the fittings. Do I need to purge the air out of the system first before I charge? I see this done on other videos and I want to make sure I’m doing this right.

Very informative video, thank you. Just about to place an order. A quick question, when you say have the unit in AC mode. Do you mean to have the unit powered on and running in AC mode while you install the r410 .. Thank you.

I have a Samsung split unit. It will on for 15 minute then stop, but when it on there is no cold air coming out just like regular air. I was wondering if it low on refrigerant? I checked the light sensor on the outside unit it said I PM OVER CURRENT. I read the manual and one the solution is to check the refrigerant level. Do you think adding refrigerant will fix this issues?

Brian, thanks for posting this! I just replaced my AC compressor in my car and recharge the system from empty vacuum state to blowing ice cold air here in Houston Texas in 140° heat. Then it occurred to me that the Mr Kool in my garage might be the same process. Your video basically confirmed that including the same R410A. Since this video is 3 years old, I am curious if the system is still holding up even with these recharges? On my vehicle I found that the only source of leaking was the actual Schrader valve where the connection is made with the can. Most vehicle ACs that leak can be tracked down to that Schrader valve. Have you ever vacuumed the entire system down and done a leak check? If so that would be an awesome video to show how that equipment connects if you are aware?

Do the multi-zone units share refrigerant between all zones or is each independent?

Sorry, I misspoke, my 5/16 connect is on the bottom, just opposite or yours?

Do you know what the >2022 replacement for 410-A is recommended in these units?

I have a question Brian. I need the dust filters for my unit. Where can I find them. (Soleus KFTHP-09-ID) please let me know. Thx

Is the unit running when you are charging it? And if you have multi heads do you need to charge each line or just one?

Hi! My mr cool indoor unit is freezing up only on low speed. Doesn’t freeze up on high. I only use it for cooling. Do you think this is low refrigerant?

As soon as I hook the Guage up to the can it shoots into the red before I even hook it up to the mini split.....what am I doing wrong?

Hi Brian, I have a 36k 4 unit showing an occasional P6 error. It seems like it want to work but will not throw heat. Do you think your product will help me ? thanks

Great I have a lg what kind of pressure should I see ???

hello from romania ,i want to know what means AC mode? i have a daikin ac system and i want to recharge with r410a but now the outside temperature is low ,about 8-9-10 celsius degrees so ,can i load now?the system can works in heat mode or he must works in cool mode -i have cool mode ,heat mode ,auto mode ,dry mode ,and fan mode ,so what is ac mode?is a cool mode??

Does it matter what the temp is outside when using the gauge? It's a little warmer today so I hooked the gauge up again and it was showing blue but close to the yellow. I gave it a couple squirts anyway so now it's basically on the border of blue and yellow. I set it back to heat mode and let it run for a while and now it's blowing warm air at about 90 degrees. But I have an identical unit that's newer and that one is putting out more like 125 degrees in heat mode right now. Is there anything else I could check?

Hello Brian! I tried using the kit but it seems the refrigerant keeps on leaking out of the brass adapter,I used pliers to try to tighten it but it still leaks and is not showing pressure on the gauge, what should I do?

Hello, is this a universal fit for mini splits? I have a perfect aire unit.

can this unit be used on a regular "non-minisplit" heat pump?

Hello, I am considering buying this for my MRCOOLDIY 48,000 BTU 4 Ton 5-Zone Mini Split Heat Pump Condenser with 2 24K air handlers. It stop heating and have a PC-03 pressure error. My question : do I need to vaccum the lines first and before adding the refrigerant? Great video!

Hi, nice video but I didn't understand one thing. Does the internal drive remain on during charging? and in what mode?

Do these diy type units shown in this video..,probably not an ideal fit for an older mobile home would it? And i mean 1977 old lol

Hi, I just order you kits. My MrCool bough at Costco 3 year ago. I think it's a 3rd generation. Watching video I notice that my small line is on top but your small line is at the bottom. Should I connect the kits to the small or big line? Thanks

Brian Mr. cool is sending me a new condenser with charged lines....can I just disconnect the old lines to the indoor unit and connect the new lines?

I installed a 12k DIY mini. When I went to tunr it on. I heard a spraying sound outside and saw a plum of white smoke. I realized i for got to unscrew out the hex key screws that opens the passage way. Does this mean its totaled? just needs recharged? or possible i ruptured the line at a weak spot? are there remedies to fixing this?

I think my Mr. Cool Easy-Pro 18k BTU comes with r290 refrigerant. Do you make a kit for that?

If you are low on Freon there is a leak somewhere as this is a closed system if you don’t find the leak than the unit will again have to be recharged again

Hey, while installing my mr cool 24k, I kinked one of the lines and it had an obvious leak of refrigerant. It probably leaked for about 10 minutes before I closed the condenser with the Allen key, and then disconnected the broken line from my other line, I will be replacing that broken line, do I have to vacuum? And will this bottle be enough for me to recharge to proper level? I don’t think all of it leaked. Probably a good amount. Will this gauge still give me to a proper reading for my 24k? Or is this only accurate for 18k

Do the quick disconnect leak more offen the the the regular flange ones??

My compressor isn't running, I got it to work for a while then it quit. I'm wondering if I try to recharge, if the compressor isn't running (cool mode) will I get an accurate read? Will low charge keep the compressor from running or do I have a larger problem?

My MrCool DIY 24k mini split unit has stopped pushing heat. Outside unit smells like antifreeze, which I imagine could indicate a refrigerant leak? Should I start with your recharge kit, checking for leaks before recharging? Is your kit sufficient for a 24k unit? Please advise.

Will this work for a Mr Cool universal system 2-3 ton? And do you run the system in what mode while charging?

how much 410a is in the kit? 1lb? 2 lb? and would this work the same for my Bryant AC? i have a very small leak in my evap A coil.. i wanted to try the leak sealer and recharge before i dump 2k+ into a new coil

Hello Brian, This is a great video. I am getting ready to order your kit. I have a Mr Cool multi zone with 4 line sets. Are each of the zones closed loops unto themselves? Each line has a service port. I suppose I should connect the recharge unit to whatever zone line that is deficient. Mr Cool was reluctant to give me information about how charge the system. Thank You.

Do you know if this will work for my Homelabs mini split 115V?

Is this item used to recharge a new mini split? For the air conditioning?

Does the product clearly state it has dye and sealant into it? Hoping to get better heat results on my Mr cool unit

Will this work on a Mr Cool 3 with 2 remote heads? Do I need to recharge Each Line? I'm getting a P6 error code and Mr Cool technical support says my system needs a recharg.

If it is in the mid 40’s F outside, and you have the unit in air conditioning, will the gauge read accurately?

Hi Brian, I can not find the location to purchase your refill kit? Please help

Just curious. AC systems are sealed and should not leak. Once they leak, you have to find the leak and fix it before charging the system again. Otherwise you will just be recharging in a month or so. Can you tell us what happened before, and what you did to fix the issue with the Mr Cool unit? I am thinking about buying one in the future, and want to know what kind of expected lifetime the units will have.

I need to recharge the entire condenser unit, how many bottles do I need? I have the 18k DIY model.

How many lbs. in the canister? Where can I order more r410a if I need it?

I have the Mr Cool DIY 12,000 unit. Initially had a bad circuit board replaced then the unit would not switch to heating mode. I have received a new outside condensor unit under warranty and want to make sure I'm doing it correctly. Should I be able to just close the valves on the current outside unit, remove the lineset connections, and then reattach them once the new unit is set and be good to go? I'm wondering if there is a potential for there to be too much charge/refrigerant with hooking a new outside unit to the existing lineset and inside handler unit being that the unit has already been opened and operated? Or am I thinking backwards and I'll have low charge/refrigerant? I'd like to order the recharge kit and have it on hand before I do the swap if that's what I'll need. TIA

I’m a tech and I’m interested. This Could save me time from having to recover and weigh in new charge. Can I use on any brand other than mr. cool ?

Mine has been having weak A/C. It works but does not seem to have anywhere near full capacity. So i bought a kit. However, the pressure tested good so I guess it's tech support time. The needle was in the blue but was a bit bouncy. Is that nornal?