Tag Archives: DIY

Pre-Charged Line Sets Are For Real, Right?

pre-charged line sets

Pre-charged line sets aren’t exactly a new innovation in the HVAC industry, but they’re not exactly widespread either. When we tell people our MRCOOL DIY line sets do not need to be vacuumed down, plenty of installers out there, professional or otherwise, just don’t believe it. But, hey, don’t take my word for it!

Pre-Charged Line Sets Are the Real Deal

A picture is worth a thousand words, so a YouTube video has to be worth like a novel or something. Anyway, check out the comments in our 2nd-generation DIY install video and you’ll find plenty of folks who don’t quite believe. If you don’t want to take the time, then I’ll sum up the highlights for you.

No vacuum? Are you kidding me?” – St2288

How is that possible?” – E Money

Don’t you have to use a vacuum pump or purge the lines?” – Juan Silva

Wait a sec, no purge of the line-set or vacuuming them down first?” – Butchtropic

Yeah, there are a few skeptics.

So, Are Pre-Charged Line Sets Real or What?

Yes! For the last time, yes!

We here at MRCOOL did not invent pre-charged line sets. They’ve been around for years, but were mainly confined to the modular and mobile home market. That might be one reason why so many people have not heard of them. Don’t worry! Pre-charged line set technology proved itself years ago.  Basically, all we’re doing is applying them in an innovative way.

Innovative How?

One or two manufacturers have used a version of pre-charged line sets on ductless mini-split units before, but we are proud to say that no one has taken it as far as we have. The MRCOOL DIY 2nd-generation Ductless Mini-Split Heat Pump is truly cutting edge technology. Our unique approach makes line sets easy and safe to handle. Best of all, any smart homeowner can put one of our DIY units up in a few hours with no specialized tools.

It’s like they’re comfort made simple or something.

Tiny Home Cooling Works Best with MRCOOL

tiny home cooling

Tiny home cooling and heating is, obviously, an important consideration. If you’re thinking about joining this growing movement, let us explain to you exactly why a MRCOOL ductless mini-split heat pump is your best option.

Tiny Home Cooling & You!

Good planning is a critical step when transitioning from a conventional house to a tiny home. Make sure you don’t forget how you’re going to stay warm or cool! The compact requirements of a tiny home mean you can’t rely on conventional central air conditioners or furnaces. If you tried, one of those units would take up a huge chunk of your livable space.

Which is bad.

You don’t have a lot of space as it is. The last thing you want to do is wake up in the morning and crawl over the furnace to get out of bed.

You need an air conditioning and heating system perfectly designed for non-traditional living.

MRCOOL Ductless Mini-Split Technology

Okay, so we didn’t actually design our MRCOOL mini-split heat pumps for tiny homes, but they work great anyway! Ductless technology has a ton of natural advantages compared to old fashioned window units or portable systems.

The biggest advantage is that, of course, a ductless unit is designed to work without air ducts for ventilation. Your tiny home is not going to use air ducts, so you need that sort of system.

Secondly, the only part of a mini-split that needs to be inside your tiny home is the air handler. This will not take up any of your valuable floor real estate. You can mount the air handler high up on an interior wall to stay out of your way in your tiny space.

Thirdly and perhaps most importantly, MRCOOL ductless mini-split heat pumps are designed for energy efficient and eco-safe operation. We manufacture some of the most efficient ductless units on the market, and all of our products rely on R-410A refrigerant. R-410A is a non-ozone depleting, chlorine-free substitute for last generation’s Freon. Tiny home living is about shrinking your footprint, and that should include your energy bill and your ozone impact.

Remember, with a MRCOOL ductless heat pump, you can live the tiny life you want without the sweat you don’t.

DIY Air Conditioner Condenser Cleaning

DIY Air Conditioner Condenser Cleaning

Your air conditioner condenser is like everything else in your home – it gets dirty. Obviously, this is less than ideal. Too much dirt and grime in your A/C will reduce energy efficiency, and is a leading cause of mechanical failure. Should you hire someone to clean the system or is DIY air conditioner condenser cleaning possible?

It is and it’s not as hard as you think.

100% DIY Air Conditioner Condenser Cleaning is Easy

The first thing you need to know about DIY air conditioner condenser cleaning is that you don’t need any special tools or chemicals. There are useful air conditioner cleaning products on the market, but they aren’t 100% necessary. Still, if you want to pick some up from your local hardware store, it won’t hurt a thing.

Let’s get started.

Exterior Condenser Cleaning & You!

An air conditioner condenser is the portion installed outside your house. As you might imagine, it can get really dirty. Dirt, dust, leaves, insects, and all sorts of other contaminants can gunk up the coils. You need to get this cleaned out for optimum running.

1. Alright genius, turn off the power. Accidental electrocution isn’t fun for anyone.

2. Clean away all the leaves, brush, and debris from the outside. Also, important tip, when you mow your lawn never point the exhaust side of the mower toward the condenser.

3. Get a wet/dry vacuum to remove the big stuff from the exterior.

4. Check to see if any of the condenser fins are bent. If they are, use a dull tool to GENTLY straighten them. Emphasis on the GENTLY.

5. Now, you’re going to remove the top grill. You’ll need some tools, but nothing exotic. Lift out the fan, set it safely to the side, and do NOT yank on any of the exposed wires. You did turn the power off, right?

6. Clean up any loose debris inside the cavity.

7. Take your garden hose and GENTLY spray the fins from the inside. You want to push any debris out. Spraying the fins from the outside will only push the trash inside the unit. This is bad.

8. Replace the fan and reattach the top grill.

9. Let the unit dry out for about 24 hours.

10. Turn the power back on to the unit, and you’re done.

And that’s pretty much all there is to DIY air conditioner condenser cleaning. It’s probably a lot less hard than you thought, and it’s a great way to keep your unit running strong all season long.


Do You Ductless Mini-Split DIY?

ductless mini-split DIY

Maybe it’s the economy. Maybe it’s just people getting more careful about how they spend. In any case, do-it-yourself home projects are all the rage. Hit YouTube and you’ll find DIY videos on everything from air conditioners to zeppelins.

Okay, maybe not zeppelins, but I couldn’t think of any other good z-words.

Ductless Mini-Split DIY & You!

Ductless mini-split heat pumps and air conditioners are a good way for you to get specific, targeted heating and air exactly where you want it. They’re great for sun rooms, new additions to an existing home, or for making a garage bearable in hot summer weather.

You’ve decided you want and/or need a ductless mini-split. What about installation? Should you hire a professional or should you do it yourself?

Good question.

To DIY or Not?

The typical ductless mini-split heat pump is a complicated machine. If you are not a certified heating and air technician, you should definitely NOT try to install one of these by yourself. Aside from the potential damage you might do to yourself or the system, amateur installation voids the warranty terms for most ductless or conventional HVAC units.

There is one glaring exception to this rule.

The MrCool DIY ductless mini-split heat pump is specifically designed for amateur, non-professional installation. You don’t have to know anything about electrical wiring, refrigerant lines, or HVAC technology to put in your own MrCool DIY simply and easily.

Before you get ductless mini-split DIY crazy with MrCool, here are some skills you should master:

  • Modern hammer swinging.
  • Screws, nut, and bolt usage and taste.
  • Self-immolation avoidance behavior.
  • Semi-functional fingers.
  • Pants (optional).

More seriously, as long as you can wield a few basic tools and handle a measuring tape, you can install your own MrCool DIY unit.

And if you ever get stuck, you can always refer to our helpful YouTube videos:


So, don’t worry, and start DIY.

Building Your Own Home HVAC Unit!

Have you ever tried building your own home heating and air system using nothing more than the junk in your grandmother’s garage and/or basement? No? I have. It’s way harder than you think it’s going to be. At first, sure, you make good progress, because you found a fan. Then, everybody in the neighborhood freaks after you lose control of the fire.

But whatever.

The point I’m trying to make is that building your own HVAC unit is not easy. Installing a unit you bought off the shelf is not as difficult, but it’s no walk in the park either. If you don’t know anything about how HVAC systems function, what to do with coolant lines, or the proper application of a screwdriver, you can run into some real problems. The MrCool DIY ductless mini-split heat pump takes a previously impossible task, and makes it achievable.

By pretty much anyone.

I do mean anyone. I successfully installed the prototype MrCool DIY in our main office, and there was only one fatality. He was an intern, so I don’t think it counts. If you don’t have any interns, you have nothing worry about.

Plus, with the MrCool DIY, it’s almost impossible to start a fire that will burn down your grandmother’s entire neighborhood.

Dearest Humans, Safety First!

Here at MrCool.com, we believe in safety!

I should rephrase that. I believe in safety, because of all the problems we had in the Radioactive Food Testing Facility a few years back. Let’s just say that irradiated, gigantic squash are a great idea in theory.

What sucks is when you accidentally turn a taste-test focus group into a rampaging team of super-powered mutants that MrCool Human Resources had a hard time dealing with. Eventually, we used gas and a match to solve the problem.

Which brings me to the MrCool DIY and safety.

Installing a conventional ductless mini-split heat pump is not terribly difficult for a trained HVAC technician, but it isn’t something your typical homeowner can do by themselves without a good bit of instruction. Since we didn’t want people accidentally spraying coolant into their eyes while installing the MrCool DIY, safety was a priority during the design phase.

So, how exactly is the MrCool DIY safe for amateur installation?

The component I’m most proud of are the precharged 410 quick connect linesets. As mentioned earlier, we determined early on in the design process that dealing with typical air conditioner coolant would be a problem for the average amateur installer. Our team built the quick connect linesets to circumvent the issue altogether. These linesets are as simple and safe as they could be. If you can handle basic tools, you can put the MrCool DIY together without worrying about leaking coolant all over the place.

Which is a really good thing!

The last thing any dedicated DIY’er wants is to install a ductless mini-split heat pump and find out its leaking coolant. Not only would this affect operating efficiency, it’s not the safest situation in the world.

Sure, way safer than radioactive mutants tearing through a research and development facility after all the containment procedures failed, but not ideal.

MrCool, Is It Really Actually DIY?

People send me all sorts of questions via the Internets. One big question that keeps coming up is about the MrCool DIY. DIY stands for do-it-yourself. My first idea was to call it the MrCool Easy-To-Install-At-Home-By-Yourself-Or-Maybe-With-A-Friend, but the marketing department shot down that idea. Apparently, the MrCool ETIAHBYOMWAF is not as catchy as MrCool DIY.

Sorry, I got distracted there. The question is this: “Is the MrCool DIY really easy to install?”

The answer is: YES.

The MrCool DIY is our most unique ductless mini-split heat pump, because our engineers, and me, designed it to be easy for the regular person to install all by themselves. There are a minimum of fiddly parts to worry about, precharged linesets to simplify the coolant connections, and, of course, it’s light for easy handling.

With the MrCool DIY, you really can do it yourself.

I know you’re skeptical. You’re probably thinking, “Gosh, I sometimes screw up microwave popcorn, can I really do this installation myself?” Rest easy, my radioactive friend, because anyone can install the MrCool DIY.

During the design stage, we hired 100 idiots to moron-proof the MrCool DIY. Aside from the one unfortunate fatality, they did great. 99 MrCool DIY ductless mini-split heat pumps were installed in only a few hours. How did we find 100 actual idiots for that test?

Craigslist, duh.

DIY on Demand

You can’t sling a alley cat these days without hitting some new do-it-yourself endeavor. But why would you? Slinging cat is weird and gross. You should only sling things like bolas and boomerangs. I’m a gifted bola slinger myself.

Moving on.

Do-it-yourself! Yes, everybody is into the ‘DIY’. It makes sense. Doing your own work on your home or car can save you a lot of money. Everybody loves money, even me. That’s why I’ve made so much of it with my many varied business ventures. I don’t do a lot with my money. I mostly reinvest, buy things I like, or put it in a big pile for the dog to roll around in. Way better than leaves.


Sorry, I got sidetracked.

What does DIY have to do with MrCool?

People are into DIY so much we here at MrCool International Enterprises decided it would be a good idea to design a MrCool heating and air system specifically for eager DIY enthusiasts. I wanted to call it the MrCool Install Your Own Ductless Mini-Split System, but the marketing department told me that was too wordy. They decided the MrCool DIY would be better.

If you’re wondering, the MrCool DIY ductless mini-split heat pump is pretty darned cool. Since it is designed for amateur installation, it comes with features you won’t find on many other systems.

The most important components of the MrCool DIY are the precharged ‘Quick Connect’ linesets. Every air conditioning system on the planet uses coolant, and most use chemical coolant. You really need to know what you’re doing when it comes to installing a regular air conditioner.

The MrCool DIY linesets are different. These linesets install easily, and come precharged with refrigerant. You don’t have to know anything about chemical coolants or air conditioner installation to properly connect the coolant linesets on the MrCool DIY.

The electrical work and the base mounting on the MrCool DIY are also designed for easy installation. Basically, wait I’m saying is that an idiot with a hammer, a screwdriver, and two brain cells to rub together could get a MrCool DIY up and running. You should be fine.