A standard AC installation in South Florida takes about one full day, from removal of the old system to final testing — usually 6 to 10 hours depending on the size of the system and any ductwork adjustments needed. Homeowners in Miami-Dade and Broward often worry installation day will be chaotic, but a well-run crew follows a predictable sequence: prep, removal, installation, permitting, and startup testing. Knowing what to expect ahead of time makes the day go smoother for everyone.
Before your installation date, a technician should have already visited your home for a load calculation — this determines the correct system size for your square footage, insulation, and window exposure. This step matters more in Florida than almost anywhere else, because an incorrectly sized unit struggles constantly against our heat and humidity. If your installer skips this step and just quotes a number over the phone, that's a red flag worth asking about before you commit to AC installation.
On installation morning, expect the crew to arrive within your scheduled window and walk the job with you before touching anything. They'll confirm the location of the new outdoor condenser, protect your flooring and furniture near the indoor air handler, and shut off power to the existing system at the breaker. A good crew explains each step rather than working silently — don't hesitate to ask questions.
Removing the old system is usually the fastest part of the day, typically one to two hours. The crew recovers any remaining refrigerant from the old lines (this is required by law, not optional), disconnects the indoor air handler or furnace, and removes the outdoor condenser. If your home still runs on older R-410A equipment, note that new systems installed under the 2026 refrigerant rules use A2L refrigerants like R-454B, which cannot be mixed with your old lines — most installations use entirely new line sets for this reason.
Installing the new equipment takes the bulk of the day — setting the outdoor condenser on a new pad, mounting or connecting the indoor air handler, running new refrigerant lines, and tying into your existing ductwork or electrical panel. If your ductwork is old, undersized, or leaky, this is also when a good technician will flag it, since new ductwork problems show up fast on a freshly installed high-efficiency system.
Miami-Dade and Broward both require a permit and a county inspection for AC replacement — this isn't optional, and you should be wary of any company that offers to skip it. Your installer pulls the permit before or on the day of the job, and the county inspector typically visits within a few days to a couple of weeks after installation to verify the work meets code. Keep copies of your permit and inspection paperwork; you'll want them if you ever sell the home or file an insurance claim.
Once the equipment is in, your technician runs startup testing before calling the job done: checking refrigerant charge against manufacturer specs, verifying airflow at each supply vent, testing the thermostat and any smart controls, and confirming the system cycles properly on both cooling and heating if applicable. This is the step that separates a system that runs fine on day one from one that runs fine for the next 10-15 years.
To prepare for installation day, clear a path to your attic or closet air handler, make sure the outdoor unit area is accessible, and plan to keep pets in a separate room. Someone 18 or older needs to be home for the full appointment. If you're financing the new system, have that paperwork settled beforehand — see our financing options if you haven't already — so the day isn't held up by anything but the install itself.
MGM A/C Appliances installs AC systems throughout Miami, Fort Lauderdale, Hialeah, Kendall, Coral Gables, and the rest of South Florida — licensed, insured, and bilingual on every job. We handle the permit, the inspection, and the cleanup, and we offer free estimates before you commit to anything. Call (786) 352-0084 to schedule your installation.