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  • Writer's pictureMarco Thomas

How to Install a New Central AC Unit - Learn the 8 Steps to Help You Avoid Installation Mistakes

For your central air conditioning system maintenance, we’ve compiled a list of things you need to know before jumping in and installing a new AC unit. This guide breaks down eight steps to help you prepare for a successful installation. It’s time to plan and install your new AC unit!


If you want to do it right the first time and avoid any expensive mistakes, follow this six-step process for successful installation:


1. AC Unit Size and Purchase: Make sure you know what size unit you need, whether it’s cooling a 1,000 square-foot house in the south or a 2,000 square-foot house in the north. A 1 ton unit will be efficient for a 1,000 square-foot home but if your home is larger than 2,000 square feet you might need a 2 ton central air conditioner.


Sizing is the most important consideration when deciding which unit to buy. If you Install a new central air conditioner, consider the climate your home experiences most of the year. A heating and air conditioning professional can help you determine what size unit is right for your home.


2. AC Type: There are four types of central air conditioning units: split systems, packaged units, ductless mini-splits, and window units. Split systems and packaged air conditioners are the most common. Ductless mini-splits are becoming more popular as they’re efficient, reliable and compact. Other than window units, the other three types do not require a contractor to install them.

air conditioning installation san diego
air conditioning installation san diego

Split systems can be installed on a crawlspace or slab, but are limited to 30 feet of underground piping. Split systems will require a crawlspace or building foundation. Package units require no underground piping and can be install inside an attic or basement.


Mini-splits are the most versatile type of AC unit. They’re installed between your home and the furnace, with a receiver that connects to your home’s ductwork. The mini-split is very popular because it also includes a cooling capacitor that absorbs excess heat from the HVAC system, reducing energy consumption by up to 30 percent compared with traditional systems.


Our last unit recommendation is the window AC, which is a great way to cool one room in your home. If you only need one room cooled but want to get the most out of your AC, a window AC is a cost-effective solution.


1) Plan your installation — Determine an area in the attic or crawl space to install the new unit. Keep in mind that units should be installed as close to your electrical service panel as possible for maximum efficiency. If you plan to add a second unit, make sure it will be facing in a different direction than the first one.


2) Locate your ductwork — Have equipment installed by a licensed professional if you have insufficient space or access for installation. Make sure the new unit will be compatible with your existing ductwork. Hire a professional to perform any necessary modifications such as cutting holes in walls or ceilings if you don’t have the right tools (we recommend using the services of an experienced HVAC contractor ).

hvac contractors san diego
hvac contractors san diego

3) Install the new AC unit — Make sure to position and secure it carefully to avoid floor vibration or damage. Be certain that the vents, louvers, and drain(s) are properly aligned for proper drainage. Test the unit to make sure the air is blowing in the correct direction (you should check this before installing).


4) Connect new vents — You can connect new vents by simply making holes through a wall or ceiling for standard ducts. If a whole wall or ceiling is needed, you will need to install a transfer box that transfers air from the old vents to the new (in most cases, the old vents are sealed off once the unit is in place).


5) Test your system — Disconnect the new unit from power before testing on a regular basis for at least two weeks to make sure it is working properly. Check for proper operation after each change of seasons such as heating systems when spring and summer season rolls around.


6) Clean and maintain your system — Always have a licensed professional inspect your system, clean it on a regular basis, and tune-up the air conditioner to make sure it is operating properly and to keep its efficiency high. It’s also a good idea to clean or replace filter once a month.


A project like installing a new AC unit can be very intimidating for those who are inexperienced when it comes to home maintenance. This article should give you enough information and guidance to help you avoid common mistakes when installing a new central air conditioning system. Whatever your needs, make sure to schedule an appointment with an experienced HVAC professional .


Conclusion: Now you know how to install central air conditioner, and have a good understanding of the process. If you still have questions after this article, we highly recommend that you speak with a professional. Your safety is worth it.


Author Bio:- Michael Cabral


Michael is a marketing manager at EZ Heat and Air. He loves writing about innovative and hybrid HVAC installation tips. His articles help readers to have valuable insights into the importance of duct cleaning, water heater maintenance and repair, optimum working of thermostat, Mini split and heat pump installation in Orange County. Read articles for more information on keeping your HVAC system in a tip-top condition and lead a hassle-free life.


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