Line sets

Reusing copper is usually allowed and usually conditional. These pages are the conditions.

• Can You Reuse Your Line Set with R-454B? Usually yes, and the reason is the oil. What the manufacturer actually makes the reuse conditional on, and what this site cannot yet tell you about your own line size.
  Checked against sources 2026-09-01

This is a starting point, not an approval. Everything here is read from published manufacturer documents and dated, but only the licensed contractor who signs your installation can approve a specific system for your home and your local code. Take the citations on this page to them and ask.