How to Install a Ductless Mini-Split Air Conditioner | This Old House

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This Old House plumbing and heating expert Richard Trethewey explains how to install a mini-split air conditioner. (See below for a shopping list and tools.)

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Richard traveled to Tampa, Florida to help a homeowner find a cooling solution for his garage. The homeowner used the garage as a workshop in the summer months, but said that it was too hot and humid in there to work comfortably. To solve the problem, Richard and local expert David Zimmerman installed a “mini-split” air conditioner. The system uses no ductwork. Instead, an air-handler unit is mounted inside on a wall, and the condenser unit is mounted outside.

Shopping List for How to Install a Mini-Split Air Conditioner:
– mini-split air conditioner [https://amzn.to/2vyimyj]
– ground pad [https://amzn.to/2Veahyb], for supporting condenser unit
– 1-inch-diameter PVC pipe and assorted fittings [https://amzn.to/2WkL6q7], used as condensate drain line
– PVC primer [https://amzn.to/2GQcbe7] and cement [https://amzn.to/2vxt6x3], used to join together PVC drain line 5. armor-sheathed electrical cable [https://amzn.to/2PKKGH1], provides line-voltage power to the air conditioner
– low-voltage wire [https://amzn.to/2LkaPOu], sends signal from air conditioner to condenser

Tools for How to Install a Mini-Split Air Conditioner:
– drill/driver [https://amzn.to/2UR4vxf]
– 1 _-inch hole saw [https://amzn.to/2IVdvjo], used to make hole for refrigerant lines
– level [https://amzn.to/2ZVAu3l], used to level pad that supports condenser unit
– drywall saw [https://amzn.to/2WjOQIz] or jigsaw [https://amzn.to/2PKAgar], used to cut hole in interior wall
– hammer [https://amzn.to/2ZTYvYy]
– pliers [https://amzn.to/2Vbozzj]
– wire strippers [https://amzn.to/2LkgVhP]

The “Mr. Slim” ductless mini-split air conditioner was manufactured by Mitsubishi Electric [https://metahvac.com/].

It was Installed by David Zimmerman, Zimmerman’s Air Conditioning & Heating, Inc.

Additional assistance was provided by Ryan Hansen, electrician, Hansen Electric, Inc.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Install a Ductless Mini-Split Air Conditioner | This Old House
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Comments

F Evans says:

dudes an a/c master

Smooth Tones says:

how to call this ductless though?

Courtney X says:

So amazingly quiet and Fastly.Cool in my room! 42db is at a whisper level. I bought 2 and installed myself.Very sturdy bracket and easy to adjust to fit windows of different size. Absolutely fabulous units!!

pcdubya says:

Good to see a man that knows his trade.

Steve Lopez says:

How come they ain't sweating

Kris One says:

Watching this makes me appreciate the labor involved in this. They have obviously edited this. This would take hours to install, maybe a couple of days.

Ray Ray says:

Does it matter where i place the outside unit.? My plan is to mount it higher then the inside unit if that is ok. ? I took into factor servicing The unit. I have windows that will allow me to mount it lower than the inside unit

Paul Henreid says:

The HVAC Technician is plumbing and doing electrical – nice work!

K O says:

Do these split ductless units require 220VAC ?

John Barone says:

I love the way the service discount magically appears, with all the wiring done back to the electric panel, the magic of television I suppose. LOL

Bill Leonard says:

Nice video. Thanks. We have a mini-split in my home office space and we’re considering one for a fixed mobile home we have down south.

B.C. Miller says:

What states can these legally be installed? I called a local HVAC company here in Tampa, Florida for a quote and was told they could not install any AC in my garage unless I permanently sealed my garage door shut (so it could never open again) and insulated it. They said they could not get a permit unless that was done. They sited EPA regulations. What's up with that?

A J says:

COME ON, GUYS. PLEASE ANSWER MY QUESTION. ARE YOU GUYS RACISTS? HOW COME YOU HAVE NEVER GONE TO A MINORITY PERSONS HOUSE IN ALL THE YEARS YOU HAVE BEEN DOING THIS SHOW. I HAVE LOOKED AT EVERYTHING I CAN'T FIND AND HAVEN'T SEEN A SINGLE SHOW WITH A BLACK, BROWN OR EVEN BEIGE PERSON. HOW COME?

Sam Skellern says:

Everything looks so easy in the US, nothing but a ballache in the UK to do anything.

Putera Faizul says:

Aircond the myu

Houyhnhnm says:

I ran out of slots on my main panel… would love one of these

Randall Gerber says:

I think potential purchasers of a Climate Right mini-split AC need to know the company has virtually no repair plan for the system. My direct experience with their tech support yielded no repair option, just replacement of the entire unit. Who wants to have to tear out and replace the entire system within 3 years? It is the only option per Climate Right support. Buyer beware. Check with your mini-split manufacturer or HVAC service experts before you buy.

Wolfof Cryptstreet says:

Didn't mention anything about how you ran the power from the main fuse box of the house. Can be very confusing for newer diyers

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