How long does AC installation take?

Hour by hour, on a normal single-system changeout

• 7:30–8:00 — Walkthrough, floor and stair protection laid, power isolated at the disconnect and the breaker. We confirm the equipment on the truck matches the quote before anything comes apart.
• 8:00–10:00 — Refrigerant recovered from the old system. This is EPA-required and not optional; anyone venting refrigerant to atmosphere is breaking federal law in front of you. Old condenser and evaporator coil removed.
• 10:00–12:30 — New coil set and sealed into the plenum. Lineset run, or flushed and pressure-tested where reuse is appropriate. New condenser positioned on the new pad.
• 12:30–14:00 — Electrical: whip, disconnect, thermostat wiring. Condensate drain and safety switch.
• 14:00–15:30 — Vacuum. The system is pulled down to remove moisture and non-condensables, then charged to the manufacturer’s specified weight and verified by superheat or subcooling. This is the step that gets rushed when a crew is behind, and it is the one that decides whether you get the efficiency you paid for.
• 15:30–16:00 — Airflow check, temperature split measured at supply and return, drain tested, walkthrough with you, thermostat set up, warranty registered.

The four things that add a day

1. Ductwork. Any significant duct work is a separate day of attic time.
2. Attic platform or decking. Older platforms often do not meet current code for a new air handler, and the rebuild has to happen before equipment can be set.
3. Dual systems. Two complete systems is two days, not one long one.
4. Electrical panel capacity. Occasionally the existing circuit is not adequate. If an electrician is needed that is a separate visit — which is exactly why we look at it during the quote rather than on the day.

What happens before install day

The load calculation and quote is one visit, about an hour. Permit application typically takes a couple of days in Frisco. Equipment ordering is same-week for common configurations and longer in July, when everyone in North Texas is replacing at once.

Realistic end to end: three days to two weeks in the shoulder season, and longer at peak. That gap is the best argument there is for replacing in February rather than August.

What you need to do

Clear access to the indoor unit and the attic hatch, keep pets somewhere else, and be home for the walkthrough at the end. You do not need to be present all day — but somebody should be there when the system is handed over, because that is when the thermostat gets set up and questions get answered.

Why one crew takes six hours and another takes ten

Given the same house, the difference is almost always in two steps: the vacuum, and the commissioning at the end.

Pulling a proper vacuum takes as long as it takes — the system has to reach and hold a target level, which on a humid day with a long lineset is not quick. A crew that is behind can cut it short, and the moisture left inside will degrade the refrigerant oil over the following years. You will not see the consequence for a long time, which is exactly why it gets skipped.

The same is true of commissioning. Measuring the temperature split, verifying charge by superheat or subcooling, and checking airflow takes half an hour and is what turns correctly specified equipment into a correctly performing system. A short day is not automatically a bad one — but it is worth asking what was measured.

Questions worth asking about the timeline

• Is it one crew for the whole job? Splitting a changeout across two partial days usually means the system sits open overnight, which is not ideal.
• What time will the old system come out? That is when your cooling stops. On a July day with a family at home, an 8am start and a 4pm finish is a very different day from a midday start.
• What happens if something is found in the attic? Get the answer before install day rather than while a crew stands in your hallway.
• Who schedules the inspection? It should be them.

Afterwards

The city inspection happens separately, usually within a week or two. We schedule it; you generally need to provide access. Nothing about your system depends on it, but the permit is not closed until it is done — and an unclosed permit shows up when you sell.

Keep three documents: the itemised invoice, the AHRI certificate for the matched system, and the warranty registration confirmation. Between them they are what you need for a tax credit, a warranty claim, and a buyer’s questions in ten years’ time.

AC installation and replacement →