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What to Expect During a New AC Installation: A Step-by Step Guide

  • Writer: Christopher Sisco
    Christopher Sisco
  • Jun 7
  • 2 min read

Has your air conditioner been struggling to keep up- or stopped working altogether? You may be looking into getting a new system installed. But, what exactly does that process involve?


As a HVAC contractor on the Mississippi Gulf Coast, I often meet homeowners who aren’t sure what to expect when it comes to replacing their AC system. This guide will walk you through the process, step by step so there are no surprises.


Step 1: The In-Home Assessment and Load Calculation


Before any installation begins, we will need to make sure your new system is sized correctly to meet the needs of your home. This is called a Manual J load calculation, and it factors in:


  • Square footage

  • Insulation quality

  • Window types and placement

  • Sun exposure

  • Number of occupants and appliances

  • Getting the right size unit isn’t just about square footage- a unit that is too big or too small can lead to inefficiency, higher bills, and comfort issues.


Step 2: Equipment Selection and Quote


Once we know what size system your home needs, we’ll go over equipment options. This is where you choose:

  • Efficiency level (SEER2 rating)

  • Brand and model

  • Single-stage, two-stage, or variable-speed compressor

  • You’ll receive a written quote that includes equipment, labor, materials, permits, and warranties- no guesswork, no surprises.


Step 3: Scheduling and Preparation


Once you approve the quote, we’ll schedule your install day and let you know how to prepare. Typically, you’ll want to:


  • Clear the area around the indoor and outdoors units

  • Make arrangements for pets or small children

  • Expect power to be off for part of the day during the install

  • We’ll pull the necessary permits and coordinate everything so you’re in the loop.


Step 4: The Installation Day


Here’s what usually happens on install day:


  • Arrival and walkthrough- We confirm details and answer any last minute questions.

  • Removal of old equipment- We safely disconnect and remove your existing system.

  • Installation of new components- This includes the condenser, air handler or furnace, evaporator coil, line set, and drain system.

  • Electrical and thermostat work- We ensure everything is wired and communicating correctly.

  • System start-up and testing- We vacuum the lines, charge the system with refrigerant, and run full performance checks.

  • Clean-up- We leave your home as clean as we found it.

  • A typical AC installation can take about 4–6 hours depending on the complexity.


Step 5: Final Walkthrough and Tips


Once everything is up and running, we’ll walk you through how to operate your new system and thermostat. We’ll also:


Register your equipment warranties and rebates if applicable

Go over basic maintenance tips

Schedule your first system check-up (optional, but recommended)


Final Thoughts


A quality AC installation isn’t just about swapping out equipment- it’s about doing it right the first time. With the right team, proper sizing, and professional attention to detail, your new system will provide years of reliable comfort.


Need a new AC system on the Mississippi Gulf Coast? Top Notch AC & Heat LLC can help. Our company is dedicated to providing top-notch residential HVAC installation and repair services to Diamondhead, Kiln, Waveland, Bay St. Louis, Picayune, Pass Christian, Biloxi, Gulfport, Long Beach, and surrounding areas. Check us out at www.topnotch-ac-heat.com to learn more. Stay cool!

 
 

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