pre-charged line sets

Precharged Line Sets Are For Real, Right?

  • October 19, 2016
  • By MR COOL

Precharged line sets aren’t 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!

Precharged Line Sets Are the Real Deal

A picture is worth a thousand words, so a YouTube video has to be worth at least a novel, right? 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.

So with this unit u don’t vacuum the line?” – Cesar Aburto

no vaccuming?” – Luigi Urbina

I just purchased one I don’t need to vacuum my line????” – EL Camaron

So, Are Precharged Line Sets Real or What?


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.

452 thoughts on “Precharged Line Sets Are For Real, Right?”

  1. It’s a cool morning today so I decided to test the heat function of my recently installed 24k diy minisplit. It is 71 degrees outside, and set the remote to heat mode 86 degrees, but not getting any heat just cool air. It’s running on heat mode for 20 mintues. Is there a problem?

  2. I want to purchase either a 18000 or 24000 BTU DIY MrCool. But only need a 16′ hose, (10′ is actual length needed) . What dealer in the Los Angeles area would have a 16′ hose as part of the package. Ones I talked to only have it in 25′ length and want me to get a technician if I want it shortened. Or pay extra for the additional 16′ hose.

  3. I read that you can connect two 25ft line sets together to get 50ft of length. Is it possible to connect an additional short set as I project needing approx 60ft of line, from the indoor unit to the outdoor unit.

  4. I purchased a 12K BTU Mcool mini for my garage. I do not have a in wall in which to put the cooling line directly behind the condenser as indicated on the template. Can i rum the gas line/drain and power line out the side of the condenser, down the interior wall, then drill the side wall towards the compressor unit? Is there an email that I can send a drawing of what I want to do?

  5. To connect 2 25ft lines together would there be a specific coupler? could you provide a part number for a 24k DIY Mni split system 3rd gen?

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