About The Line Set
The Line Set is a store with a narrow focus on purpose: the parts that connect a ductless mini-split together — refrigerant line sets, line set covers, and mounting brackets.
We started here because it's the part of a mini-split install where most people get stuck. The indoor head and outdoor condenser are the easy decisions. Then come the questions: what diameter line set does my system need, how long, flared or quick-connect, how do I hide it on the wall, how do I mount the condenser so it stays level. The answers are scattered across forums and PDF manuals, and the parts are buried in giant catalogs.
What we're building
A simple, accurate place to figure out the right parts and buy them. That means tools that do the thinking for you — a size calculator, a size-by-brand lookup, and a clear size chart — plus plain-English guides on installing a line set, choosing between connection types, and the 2026 refrigerant change. All of it is backed by a focused catalog of the line sets, covers, and brackets that actually fit common systems.
Why just line sets?
Because focus is how you get it right. A store that sells everything treats the line set as an afterthought — a single SKU in a catalog of thousands. We treat it as the product. That's why we publish verified sizing for specific brands (MRCOOL, Pioneer, Daikin, Mitsubishi, and more), keep our guidance current with the move to R-454B refrigerant, and would rather send you to your unit's manual than guess.
What we believe
- Specs over guesswork. Line set sizing isn't a matter of opinion — it's set by your system. We point you to the right size and always tell you to confirm it against your unit's manual.
- Honest guidance. If a part isn't right for your setup, we'd rather tell you than sell it.
- Built for both ends of the trade. Whether you're a homeowner doing your first DIY mini-split or a pro who installs them weekly, the goal is the same: the right parts, fast.
The Line Set is independently run in the United States. Have a question or a part you wish we carried? Get in touch — we read everything.