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.

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

  1. what are the exact measurements of your 25 feet line? does that include the connection areas to the head and condenser? I have an install that may come down to every inch.

  2. I need to replace a diy lineset, I know I can close the valve on the outside unit but what about the air handler? Will I need to pull a vacuum after i replace the line?

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