Can I legally install my own AC unit myself?

You can legally install your own AC only if you follow local permit requirements and hold the proper certification to handle refrigerant; otherwise, DIY installation is not permitted. The most common roadblock is refrigerant work, which typically must be performed and documented by a certified technician for code and warranty compliance. Electrical connections, line‑set brazing, pressure testing, and commissioning must also meet mechanical and electrical codes, and many manufacturers will void warranties after non‑professional installs. Our team regularly installs code‑compliant systems in the Royal area and can advise you on what the authorities usually require.

If any of these apply, do not DIY:

• Opening or charging the refrigerant circuit
• Running new high‑voltage electrical circuits
• Tying into a furnace/air handler with new controls

Before purchasing equipment, call your building department to confirm permits, inspections, and refrigerant rules so you choose a safe next step.

Updated: 2026-07-28

Need help in Royal, IL? Call 217-247-4108 or book online. "Very happy with the AC install from Lanz and it's performance so far." — Dillon H.