How Long Does It Take to Install an AC Unit?

When you’re upgrading your air conditioning system or installing one in a new home, one of the most common questions homeowners ask is: how long does it take to install an AC unit? Whether you’re replacing an old unit or outfitting a new property in the St. Louis area, understanding the time commitment can help you plan ahead and avoid discomfort during the process.

So just how long does it take to install an AC unit? Read on to learn more or contact the experts at Galmiche & Sons in St. Louis to request a quote and plan for your air conditioner unit installation services.

What Factors Affect the AC Installation Timeline?

There are several variables that influence how long your AC installation will take. On average, a standard central AC installation can take between 4 to 8 hours, but more complex situations may require additional time. Here are the key factors that impact installation time:

Type of Air Conditioning System

Central AC Systems: These typically take one day to install if no major modifications are needed.
Ductless Mini-Splits: These can be faster if there are only one or two indoor units, but multi-zone systems may take longer.
Heat Pump Systems: May require a longer setup due to dual-function heating and cooling capabilities.

Home Layout and Accessibility

Tight attic spaces, crawlspaces, or multi-story homes in the St. Louis area can increase installation time. Easy access to installation areas helps speed up the process.

New Install vs. Replacement

New Installations: If ductwork, electrical work, or drainage needs to be added, the process could take 1 to 3 days.
Replacements: If the existing infrastructure is in good shape, the work is often completed in a single day.

Permits and Inspections

Depending on local codes in St. Louis, permits and inspections might be required. If so, it may add a day or more to the overall timeline depending on availability.

Step-by-Step Breakdown of a Typical AC Installation Process

Step 1: Pre-Installation Evaluation (1–2 hours)

A technician assesses your existing HVAC system, discusses your cooling needs, and selects the right air conditioner size for optimal performance.

Step 2: Equipment Removal (1–2 hours)

If you’re replacing an existing system, the old unit and any necessary components will be removed safely.

Step 3: Site Preparation (1–2 hours)

This step includes preparing the ground or platform for outdoor condenser placement, updating electrical or duct connections if needed.

Step 4: New Unit Installation (3–6 hours)

The indoor evaporator coil and outdoor condenser unit are installed. Refrigerant lines, electrical connections, and condensate drains are hooked up.

Step 5: Testing and Final Inspection (1–2 hours)

The system is powered up, tested for performance, and adjusted to ensure everything is running efficiently.

Common Delays to Be Aware Of

Weather conditions: Heavy rain or extreme heat can slow down outdoor installation tasks.
Inadequate ductwork: Duct repairs or modifications may add several hours or days.
Electrical upgrades: If your electrical panel needs work, this can delay the process.
Unavailable equipment: If a particular AC model or part is out of stock, scheduling may be pushed back.

FAQs About AC Installation Timelines

Can I stay in my home during installation?

Yes, most installations are not disruptive enough to require leaving your home. However, there may be brief periods when your power is turned off.

How can I prepare my home for installation day?

Clear access to work areas, secure pets, and make sure someone is home to grant access and answer questions.

Will installation be faster if I choose a ductless AC?

It can be, especially for single-room installations. Multi-zone ductless systems may still take a full day or more.

Trust Galmiche & Sons for Expert AC Installation in St. Louis

With over 70 years of HVAC experience in the St. Louis area, Galmiche & Sons is your trusted local source for professional AC installation. Our licensed technicians ensure a smooth, timely, and code-compliant installation process, whether you’re upgrading your system or outfitting a new property.

We understand that your time is valuable, and we work hard to meet your schedule while delivering high-quality workmanship you can rely on.

Ready to schedule your AC installation or need a quote? Contact Galmiche & Sons today to learn more or request a quote for your new HVAC system. We’re here to help keep your St. Louis home cool and comfortable all summer long.