Inexpensive and Quiet HVAC Answer for Residence Studios — MRCOOL DIY Mini-Splits — Professional Audio Recordsdata

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Studio with Mr. Cool system.

Having taught acoustics for a number of years now I can say that HVAC (heating, air flow and cooling) is a matter that deserves rather more consideration than is often given in most textbooks. Years in the past I moderated a panel dialogue that included Paula Salvatore (Capitol Studios) and Candace Stewart (EastWest Studios), and each agreed that HVAC was a significant concern in day-to-day operations. Of their case, it was extra about maintaining programs functioning and sustaining a cushty environment within the studio conducive to inventive manufacturing. These working in residence challenge studios face a wide range of HVAC challenges that skilled areas have solved with costly infrastructure, remoted fan & mechanical noise and specialised ductwork. However these options lie nicely past the useful resource limitations for many home-based producers.

Typical residence studios are heated and cooled by conventional residential means together with commonplace compelled air heating and cooling through ductwork, radiant heating and window AC models. The largest ambient noise producer by far is the window AC unit. It’s noisy, ugly and inefficient. Whereas skilled studios are involved with maintaining programs operational, the largest hurdle in challenge studios is limiting ambient noise to a workable minimal. Usually, producers will convert garages or massive indifferent sheds into music manufacturing studios. These areas normally should not have current ductwork. Whilst you would possibly get away with an inefficient house heater within the winter, the infamous window AC unit has been the one cooling possibility for a while.

With the introduction of the mini-split warmth pump, that has all modified. These versatile models can present heating and cooling with multi-zone functionality and excessive effectivity. They’re additionally exceptionally quiet, making them a perfect alternative for challenge studio HVAC. What’s extra, there at the moment are DIY programs obtainable that may prevent some severe coin. MRCOOL, an HVAC firm based mostly in Kentucky, has led the best way within the DIY market providing all kinds of HVAC options that you may set up your self.

Not too long ago, I bought a home that had a wooden range as the one warmth supply and a loud, apparent window AC that labored to chill the whole home. I deliberate to have a mixing studio and different recording areas in numerous rooms, so a quiet HVAC resolution was wanted. The home had no current ductwork and the roof was flat, so putting in ducts wasn’t an possibility both. Gratefully, MRCOOL got here to the rescue and supplied to offer two DIY multi-zone programs. The stability of this text will doc the set up course of and my preliminary expertise with the system, together with some sound stress degree measurements of the assorted parts. This isn’t a step-by-step set up information by any means — there are many sources obtainable from MRCOOL and from third get together content material producers on-line that go into nice element relating to the method. Take into account this extra of an summary from the angle of a home-based producer and musician. However first…

What’s a Mini-Break up?

A typical AC unit has two parts: an evaporator and a condenser. They work in tandem to take away heat air and inject cool air into an area. A mini-split separates these two parts in order that the condenser is put in exterior and a number of air handlers are put in inside — therefore the time period “cut up.” They’re related with a pair of refrigerant traces known as a line-set and {an electrical} communication cable that controls the capabilities of the air handler. Whereas conventional duct-based AC models could have one central air handler for the entire system, mini-splits have unbiased air handlers for every room or zone — therefore, the time period “mini.” These programs are extra environment friendly, partly as a result of there is no such thing as a vitality loss inherent in duct-based models, and there are even tax incentives obtainable for folks seeking to make the swap.

If that wasn’t sufficient, these programs can’t solely present cooling, however heating as nicely. The out of doors element, referred to as a warmth pump, makes use of what’s known as the second legislation of thermodynamics, which in essence states that warmth at all times strikes towards chilly. I received’t faux to totally perceive how the gadget works, however happily, with the MRCOOL DIY system, you actually don’t have to know the way it works to put in it. My analysis discovered skilled HVAC set up charges to be equal to and even higher than the tools price itself, successfully doubling the worth of a brand new system. So for producers who would moderately spend their cash on gear, the DIY route is a superb possibility.

Pre-Buy Analysis

BTU’s (British thermal models) are usually used to measure your vitality wants, and every HVAC gadget is rated to ship a sure spec. My explicit state of affairs known as for 2 unbiased 36k BTU programs, every with two zones (which means two inside models in numerous components of the home), however with the aptitude to broaden to 4 zones. Your explicit wants will rely on the sq. footage in your house in addition to ceiling peak. There are a number of on-line sources to find out the suitable BTU capability on your state of affairs, together with Calculator.web.

Mini-split programs have sure limitations relating to the size of particular person line-sets, so do your analysis earlier than ordering and ensure the position of the compressor(s) will likely be accessible to every air handler. A typical most distance for one line-set is 50 to 75 ft, and there are different limitations for variations in elevation between models and compressors as nicely.

Additionally, you will want to put in a devoted 240v circuit with a disconnect field for every compressor. You should have ample amperage obtainable in your electrical panel as nicely. My chosen system required a 208-230V circuit with a max fuse breaker of 60 amps and a minimal circuit ampacity of 40 amps. Whilst you can set up this circuit your self when you’ve got the know-how, MRCOOL recommends contracting a licensed electrician for this process, as do I. Excessive voltage and amperage circuits are to not be fooled with. Circuit specs and line-set limitations can be found from the producer.

Receipt of the Tools

As promised, my MRCOOL programs arrived by widespread provider on two pallets weighing over 800 kilos. As I peered on the behemoth cargo sitting on the foot of my driveway, I instantly regretted my choice. “I’m a musician, not an HVAC installer,” I stated to myself. “WTF am I doing!?” I might have sworn I heard a number of HVAC guys fiendishly laughing within the distance. However my trepidation subsided as I started to unpack the assorted parts and issues began to fall into place. Every system included a compressor, air handlers, distant controller, refrigerant line-sets, line guards and a wall mounting bracket. There have been additionally mandatory instruments for the set up (Allen wrench, gap noticed and two adjustable wrenches), numerous insulation and sound dampening materials and enormous tie wraps. These programs are additionally Wi-Fi succesful and include a flash drive that gives connectivity and management through your mobile phone or good speaker (Alexa and Google Assistant). This performance contains the flexibility to manage your system from wherever on this planet, make the most of geofencing (robotically flip your system on and off based mostly in your proximity), handle timing schedules, maintain vitality utilization statistics and extra.

Mini-split delivery
Mini-split delivery 2

After opening the primary air handler I did one thing I not often do with audio gear — I learn the whole guide — twice! I additionally sought out as many YouTube set up movies as I might discover. Maybe not surprisingly, none of them talked about audio manufacturing, however I pushed ahead nonetheless.

Set up of the First Air Handler

I selected to start the method by putting in the biggest air handler (24k) that might be closest to the compressor. The set up course of is analogous throughout all of the air handlers. You find studs within the chosen location (an honest stud finder is very helpful for this), and use the supplied cardboard template to find out the place the mounting bracket will likely be positioned. This additionally ought to assure that the three” gap required to route the line-set, electrical cable and drainage line will fall between studs (usually 16” aside).

stud finder
Cardboard template
Mounting bracket

As soon as the mounting bracket is put in, you drill a big 3” gap utilizing the supplied gap noticed. You will want an honest energy drill for this. I used a cordless DeWalt, which labored fantastically. Earlier than committing to the big gap, I drilled a small information gap to verify the outside gap location would work. Additionally, MRCOOL recommends a 1/4” slope down from the inside gap to verify the drainage tube flows properly. My state of affairs was pretty simple since my inside is drywall and the outside is wooden siding. Stucco or masonry would current further challenges and you could want extra applicable drill bits in that case. If you’re not comfy drilling 3” holes via an exterior wall in your house, be a part of the membership. However the first one is the toughest and after putting in the supplied PVC gap sleeve, every thing seemed clear and good. My confidence degree skyrocketed.

Drilling a small hole
Drilling a large hole
Hole sleeve

With the principle gap drilled, the outlet sleeve put in and the mounting bracket firmly hooked up, it was time to arrange the refrigerant traces, electrical conduit and get the drainage hose hooked up to the unit for set up. This concerned bending the line-set out to a 90-degree angle from the unit and wrapping them along with {the electrical} conduit and drainage line utilizing the supplied vinyl tape so that they might be fed via the big exterior gap because the unit snapped onto the mounting bracket. Since this was a 24k air handler and a bit heavy, it was important to have assist with this step. I used to be a bit involved about this after watching how precarious it appeared in a number of movies. However it all went surprisingly nicely and I used to be prepared for the following step — attaching the refrigerant line-sets and working them to the compressor location together with the conduit. The drainage line can be cut up out from the bundle in order that gravity might do its factor.

Mounted air handler
Exterior hole

Operating the Line-Units

The road-sets are available coils that have to be flattened out earlier than connecting to the air handler. These are copper tubes that may be kinked and rendered ineffective if care is just not taken when bending round corners. I used to be fairly involved about this having by no means run refrigerant traces earlier than. However MRCOOL line-sets provide additional safety in opposition to kinking by means of spring-wrapped traces, so my fears had been considerably allayed.

Kink Resistant Line Set by MrCool

Kink Resistant Line Set by MrCool

The programs had been additionally shipped with line guard covers for each protecting and aesthetic causes (obtainable at further price). These helped to maintain the line-set in place, because it was put in utilizing the included tie-wraps.

Line-set guard covers
Line-set guard covers2

The second air handler was to be in my mixing room, and I started the work beaming with confidence after the profitable 24k set up. However when drilling the three” gap for the unit I encountered a wall stud that went undetected by my stud-finder and mustn’t have been there, based mostly on the 16” heart to heart commonplace stud format. Fortunately, I used to be in a position to feed the line-set across the stud, which solely partially impeded the outlet. Disaster averted!

Wall stud in the hole

Compressor Location

Concerns for finding the out of doors compressor unit embrace:

  • Will the unit be wall-mounted (brackets required and obtainable from MRCOOL), or put in on a slab or concrete pad (would require some further preparation)?
  • Is there ample airflow across the unit?
  • Is the placement shut sufficient to every inside unit to succeed in with obtainable line-sets? In accordance with MRCOOL, “…the utmost mixed line set size for all rooms [is] 221.5 ft. The utmost line set size for one indoor unit is 73.8 ft. The utmost peak distinction between an air handler and the compressor is 49.2 ft, and the utmost peak distinction between two air handlers is 33 ft.” The corporate presents 16’, 25’, 35’ and 50’ line-set lengths.
  • Availability of a 240 voltage circuit and/or set up price.

Mr. Cool compressor location

Based mostly on these concerns I selected to find the primary compressor close to an current, however soon-to-be-removed, annoyingly loud window AC unit. There was already a 240 volt circuit in place with the correct amperage and all that was wanted was to exchange the outlet with a disconnect field.


It needs to be famous that whereas the system is known as DIY, it’s not DIA (do-it-alone). The 36k compressor weighs in at 170 kilos, so that you’ll have to name in some favors to assist get the unit to the set up location. The second compressor can be mounted on a wall bracket at the back of the home.

Compressor wall mounting bracket

Mr Cool DIY programs include pre-charged line-sets in order that no further tools is required. All that’s required are a few adjustable wrenches to attach the line-sets and an Allen wrench to open the valves, all of that are included. As soon as related and useful you spray the connections with some soapy water to verify for leaks.

Connecting the line-sets
Opening the valves

Electrical Connection

To reiterate, putting in the required circuit for a Mini-Break up is to not be taken flippantly, and I extremely advocate utilizing a licensed electrician for this a part of the job. Except you are feeling completely assured that you just received’t burn down your own home or electrocute your self, the few hundred {dollars} it’s going to price is a worthy funding. In my case, I wanted two circuits put in, one among which required nearly 100 ft of conduit to succeed in the again of the home. So I bit the bullet and had it completed proper.

Electrical conduit

After the disconnect field was put in by my electrician and the compressor was wired in, I felt assured in connecting the person models with the color-coded and numbered wires.


Now that the models had been wired in, refrigerant traces related and drainage traces put in, I checked for leaks and basic operation. As soon as every thing checked out I completed the set up of the road covers and stowed away extra tubing close to the compressor. It’s endorsed to maintain issues neatly coiled up horizontally to keep away from attainable oil traps within the line.

Compressor and coil

Measurements and Recording Exams

Measuring AC noise

Earlier than I started the challenge I took some SPL measurements of the present window AC unit from inside and out of doors for comparability functions. I repeated this course of for the newly put in models. I prefer to file in numerous rooms in my home relying on the context. For instance, I favor a extra reverberant house for acoustic guitar, so a flippantly furnished front room with hardwood flooring and textured partitions turns into an important monitoring room. I put in a 12k air handler in my mixing house, which is comparatively small and handled primarily with 2’x4’x4” absorption panels made with inflexible insulation. This room initially had no warmth and only a ceiling fan which will likely be eliminated to make manner for a cloud absorber. Since that is the place I spend most of my time, ambient noise from the unit was a priority, nevertheless it turned out to be amazingly quiet and environment friendly. See sound degree measurements beneath.

Sound Level Measurements

I used to be notably impressed with the extraordinarily low ambient noise degree of the 12k unit. For all sensible functions, it was sonically invisible on the low fan setting, which turned out to be greater than sufficient to maintain the room at a cushty ambient temperature. Notice the numerous distinction in out of doors noise degree between the MRCOOL compressor and the window AC unit. A swap to a warmth pump system will certainly make your neighbors very blissful. I additionally did some sound recordings to see if there was a distinction within the frequency content material between the window AC unit and the mini-split. The window unit had considerably extra high-end frequency content material whereas the MRCOOL system appeared to extra carefully resemble pink noise.


After working in conditions with window AC models, compelled air programs and the clanking, steam-based radiators present in NYC residence buildings, I’m utterly bought on mini-split expertise as the best choice for residence studio HVAC. Whereas contemplating HVAC options are nowhere close to as attractive as shopping for a brand new synth or microphone, choosing the proper system could have long-lasting implications on your productiveness. A cushty setting is important for the inventive juices to circulate. Reaching sufficient local weather management with a quiet and environment friendly system at an affordable price is now utterly inside attain for home-based producers. MRCOOL has produced a wonderful do-it-yourself resolution that fills an ever-expanding area of interest. Admittedly, DIY programs should not for everybody, but when you should utilize a number of instruments and comply with instructions, you possibly can definitely set up one among these infants by yourself. Whereas I don’t see the potential for a MRCOOL sales space on the NAMM present taking place anytime quickly, as increasingly home-based challenge studios emerge, the necessity for inexpensive and quiet HVAC programs will definitely rise. Though this technique continues to be comparatively new to me, my preliminary experiences with MRCOOL tools and technical assist have been wonderful and I can wholeheartedly advocate them as a viable DIY HVAC resolution. Search for an replace to this text in a number of months because the climate adjustments and issues unfold.

Try my different articles, opinions, interviews, and my video tutorial collection, Synthesis 101 obtainable completely on The Professional Audio Recordsdata.

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Philip Mantione

Philip Mantione is a composer, synthesist, guitarist, educator and sound artist lively within the LA experimental music scene. His music has been introduced in festivals, museums and galleries worldwide. His present challenge is TriAngular Bent, an electroacoustic trio that includes Don Preston (founding member of Frank Zappa’s Moms of Invention) and circuit bending virtuoso, Jeff Boynton. Particulars at


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