BOLDR HOME

How Long Does Mini-Split Installation Take?

by Dua Jones May 15, 2026

A single-zone mini-split installation by a professional HVAC contractor takes 4–8 hours on a standard single-story home with an accessible exterior wall. A whole-home multi-zone system with 3–5 indoor units typically takes 1–2 full days. The electrical work (dedicated circuit installation) may be scheduled separately and adds 2–4 hours for a licensed electrician. This guide covers time estimates for every common installation scenario.

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Installation Time by System Type

System	HVAC Labour Time	Electrical Time (if new circuit)	Total On-Site Time
Single-zone (standard installation)	4–6 hours	2–3 hours	1 day
Single-zone (complex — long line set, multi-story)	6–10 hours	3–4 hours	1–2 days
2-zone system	8–12 hours	3–4 hours	1.5–2 days
3-zone whole home	12–16 hours	4–6 hours	2 days
4–5 zone whole home	16–24 hours	5–8 hours	2–3 days
MrCool DIY (single zone, homeowner)	4–8 hours (mechanical only)	2–3 hours (licensed electrician)	1 day

What Takes the Most Time

Line set routing: Running the refrigerant pipes through walls, ceilings, or attic spaces is the most time-variable part of the job. A straight 15-foot run through an exterior wall takes 30 minutes; a 60-foot run through an attic and down an interior wall takes 3–4 hours.
Electrical work: Running a new 240V circuit from the main panel to the outdoor unit location — especially through finished walls or long distances — is the other major time variable.
Multiple units: Each additional indoor unit adds roughly 3–4 hours of HVAC labour for mounting, line set connection, drain routing, and wiring.
Permits and inspections: Permit applications are typically submitted before the work begins and inspections occur after completion. These do not add to on-site time but can add days to the project timeline.

Can I Be Home During Installation?

Yes — in fact, it is recommended. You will need to be present to discuss placement decisions, answer questions about routing preferences, and ensure the installers have access to the electrical panel, attic, and any crawlspace. Plan to be available for the full installation day.

Frequently Asked Questions

Do I lose heat or AC during mini-split installation?

The mini-split installation itself does not require disabling your existing heating or cooling system. The wall penetration (3-inch hole) is typically filled quickly and does not cause significant heat loss. If you are replacing an existing system, the old system may be disconnected before the new one is operational — discuss timing with your contractor to minimise any gap.

How long does it take to get a permit approved?

Permit approval times vary widely by municipality — from same-day in some jurisdictions to 2–4 weeks in others. Your contractor should handle the permit application and will typically schedule the installation for after approval is received. In many areas, work can begin on a "posted permit" basis while the official approval is processed.