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Home » How to Install a Ductless Mini-Split Air Conditioner | This Old House new a/c technology

How to Install a Ductless Mini-Split Air Conditioner | This Old House new a/c technology



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

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

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How to Install a Ductless Mini-Split Air Conditioner | This Old House
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47 thoughts on “How to Install a Ductless Mini-Split Air Conditioner | This Old House new a/c technology”

  1. Can anyone tell me what the little white roll of cloth is for that comes with these Mitsubishi head units? It's in the bag with the manuals and the remote. I've had two different contractors install these at different times, and both just left me with them. I have no idea what to do with them.

  2. My dad wanted to get a small portable AC and I said that now adays they sell real split air conditioners for under 1000 bucks and that I would gladly come and install it with him. This video confirms what I imagined what the install would be like just looking at the unit. If we get the electricity ready in advance Im sure we can start after lunch and be ready by dinner time.

  3. That’s some pitiful electrical work. Puts the stranded wires under a screw without a crimp on connector
    That is that not how seal tite conduit goes together either. You don’t just push it on. He also didn’t valve off the vacuum at the port. No sleeve or sealing of the hole. No proper tightening of the flare. Overall butcher job. This is why you should do it yourself.

  4. You absolutely want to use a pipe bender on that soft copper. If you're a diy person DEFINITELY do NOT try what he just did on that copper line.

  5. Hello
    Dear ,sir we buy a month ago new split unit, model no, 18hfaa b, sir our indoor bottom sticker printed r410a refrigerant but outdoor unit print r32 refrigerant, i don't know how is possible, dealer mistake ?,
    Is that ok or we need to change outdoor r410a refrigerant same as shown and print on indoor unit, please answer,

  6. I would love to have a professional come install one of these in my shed, but I assume they would need a permit and then the city would know my shed roof is taller than ordinances allow and that I put up a 7 foot tall fence without a permit. = (

  7. After watching a couple of TOH videos about mini-split systems I now know why installation costs are so high. That is a lot of work putting in one of these systems and what it means to have qualified installers. Thank you.

  8. Most warranties aren't covered unless you get an hvac person to vacuum the lines. There are some models for diy that don't need vacuuming. The outside hole must be 1/2 inch lower than inside so water won't freeze in winter. You have to know what size circuit breaker to use. Should have put special lube on fittings. There are better videos.

  9. i had a multi-unit system for my row home here in philly. Gettting it installed professionally is what makes it so expensive. But ducts weren't an option cause it would have required all the walls to be removed. Its great though, can even use them in the winter if youd like. They heat as well as cool

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