How Long Does an AC Installation Actually Take?

The honest answer

A straightforward residential change-out — new condenser, new air handler, existing ductwork in usable condition — is typically one day, roughly six to nine hours. Most South Florida homes fall into this category.

Anything that touches ductwork, electrical service, or a different equipment location moves you into two days or more.

What actually happens during the day

• Protection and prep. Floors and walkways covered, work area set up.
• Recovery. Refrigerant is legally recovered from the old system — not vented. This is a regulated step and it takes time.
• Removal. Old condenser and air handler out, old pad or stand assessed.
• Setting the new equipment. Pad or stand, hurricane tie-downs, clearances, level.
• Connections. Line set brazed under nitrogen, drain line built with proper fall and a correct trap, electrical, thermostat wiring.
• Evacuation. The system is pulled into deep vacuum to remove moisture and non-condensables, and it must hold. This step is where corners get cut, and skipping it shortens the life of the equipment.
• Charge and commission. Refrigerant weighed in, superheat and subcooling verified, airflow and temperature split measured, safeties tested.
• Walkthrough. Thermostat, filter location and size, drain maintenance, warranty registration.

If a crew is in and out in three hours, ask which of those steps happened.

What turns one day into two

• Duct replacement or major repair. The single biggest extender.
• Electrical work — a new disconnect, a circuit that needs resizing, or panel capacity issues.
• Moving the equipment to a different location, or a new line set route.
• Attic access problems — no platform, tight hatch, no walkway.
• Condo and high-rise logistics — service elevator bookings, restricted work hours, association approval. In a tower this is usually the real constraint, not the mechanical work.
• Discoveries on the day — a rotted platform, an undersized return, a drain with no fall that has been failing for years.

Permits and inspection

A change-out in Miami-Dade, Broward or Palm Beach normally requires a mechanical permit, and an inspection follows — usually days or weeks later, and it does not delay your cooling. The system runs from day one. A contractor who suggests skipping the permit is exposing you, not saving you: it surfaces at resale and can affect insurance.

How to make the day go faster

Clear a path to the air handler and the outdoor unit, move vehicles, secure pets, and make sure someone with authority to make decisions is reachable. If anything unexpected is found, a five-minute phone call beats a crew standing around.