Understanding Longer Line Set Options for MRCOOL DIY 5th Gen Mini-Split Systems
MRCOOL DIY Direct custom-bundles pre-charged line sets, MRCOOL couplers, and the correct shielded control wire so your install is smooth, professional, and reliable.
What Comes in the Standard DIY Line-Set Kit?
- 25-ft pre-charged line set
- 25-ft shielded control wire
Great for straightforward installs. For larger homes, unusual layouts, or specific mounting locations, choose a longer option below.
Choosing an Alternate Length: What to Expect
- Your order is custom-bundled after purchase (not pulled from a factory bundle).
- Processing time: allow an additional 1–2 business days before shipment.
- You’ll receive the exact pre-charged line set length selected and the correct length of shielded control wire.
How We Supply Different Lengths
Depending on the total length, you’ll receive either a single continuous line set or two line sets joined with official MRCOOL couplers.
| Selected Length | What’s Supplied | Notes |
|---|---|---|
| 16′ | One 16′ pre-charged line set | Replaces factory 25′ |
| 25′ (standard) | 25′ line set + 25′ control wire | Factory bundle |
| 35′ | One 35′ pre-charged line set | Single, continuous |
| 41′ | 25′ + 16′ line sets + MRCOOL coupler + matched control wire | Two sets joined |
| 50′ | One 50′ line set + 50′ control wire | Single, continuous |
| 60′ / 66′ | Configured from available lengths + coupler(s) + matched control wire | Project-specific |
| 75′ | 25′ + 50′ line sets + MRCOOL coupler + 75′ control wire | Two sets joined |
Why We Include a Full-Length Shielded Control Wire
MRCOOL DIY mini-splits are inverter-driven “smart” HVAC systems. The control cable carries data and must be shielded and continuous. Splices can introduce communication errors, interference, or corrosion. We include the correct continuous cable for your run length to keep the system reliable from day one.
Line-Set Options by Product Line
5th Gen DIY Single-Zone
Included: 25′ line set + 25′ shielded control wire. Optional: 16′, 25′, 35′, 41′, 50′, 60′, 66′, 75′ (couplers where required; control wire upgraded to match).
5th Gen DIY Multi-Zone
Per-zone options: 16′, 25′, 35′, 41′, 50′, 60′, 66′, 75′. We custom-prepare packages to your air-handler locations and distances.
EZPRO DIY
Included: 16′ line set + control wire. Optional: 25′, 35′, 41′, 50′, 60′, 66′, 75′.
MRCOOL Advantage (Non-DIY)
Included: 16′ traditional flare line set. Optional: 25′ or 50′ flare sets. Important: Advantage is not pre-charged; a licensed HVAC technician must evacuate and charge on install.
Line Set & Control Wire FAQs
Do longer line sets delay shipping?
Yes. Custom bundles typically add 1–2 business days before shipment.
Will I get a continuous line set?
When possible, yes. Some lengths (e.g., 41′ and 75′) use two pre-charged line sets joined with official MRCOOL couplers.
Why replace the control wire on longer runs?
Inverter systems require a continuous shielded control cable for clean data signals. We include the correct length to avoid splices and issues.
