The MRCOOL 5th Gen DIY Line Set is a required component for installing your MRCOOL DIY ductless mini-split system. This 25-foot model is pre-charged with environmentally friendly R-454B refrigerant and works with MRCOOL's DIY 5th Gen 9K, 12K and 18K air handler units, featuring 1/4” liquid and 1/2” suction lines.
Equipped with Quick Connect fittings, the line set allows for fast, tool-free installation—no vacuuming, charging, or special certifications needed. Built with durable, kink-resistant materials and a leak-proof design, it ensures long-lasting, efficient performance. Available in multiple lengths, it’s the key to making your HVAC setup truly DIY-friendly.
| Series |
5th Gen DIY Line Set - R-454B |
| Compatible Air Handlers |
9K, 12K, & 18K 5th Gen DIY |
| Line Set Length |
25 ft |
| Lineset Fitting Type |
Quick-Connection |
| Gross Dimensions |
32.09" D x 4.92" H x 32.09" W |
|
Color |
White |
|
Color Family |
Bronze/Copper Metallic |
|
Refrigerant Type |
R-454B |
|
Refrigerant Volume (Oz) |
2.12 |
|
Liquid Line Size |
1/4 |
|
Suction Line Size |
1/2 |
|
Registered Warranty |
N/A |
| Has Batteries | No |
|
Contains Electronics |
No |
|
Contains Chemicals |
Yes |
|
Contains Aerosol |
Yes |
|
Contains Compressed Gas |
Yes |
|
Proposition 65 Warning |
Yes |
|
Restricted States |
GU;PR;VI |
|
Net Weight (Lbs) |
12.1 |
|
Gross Weight (Lbs) |
16.5 |
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I ordered a HVAC system and it arrived in a timely manner and with no apparent issues. I thought the system was defective once installed but it was the installers fault who wired it wrong. My only issue would be the fee (30% I believe) to return a defective item within the 30 day return policy. If it is defective the customer shouldn't have to pay a fee to return an item that is not operating as designed. Other than that this is a good company.
Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!
Installed with ceiling cassettes... Quiet and keeping us cool so far !
Was easy to install. Directions were easy to follow and unit is working great
I would buy elsewhere. Unit works pretty well. We get phone calls every couple weeks trying to sell us a warranty. This website sold our information to them. They made a few dollars, and we pay for it every 2 weeks getting call after call trying to sell a warranty.
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