Central Air Conditioner Buying Guide

Buying a new central air conditioner for your home is definitely a big deal. There are tons of options, brands, and models. Which should you choose? Does higher energy efficiency really matter? Is one kind of compressor better than another? How do you know if the warranty is a good one or not?

You've got questions, and we hope this central air conditioner buying guide can help.

Central Air Conditioner Fundamentals

What do we mean when we talk about a central air conditioner?

Basically, we mean a system in which your home air is cooled at a central location before being dispersed back into the building via air ducts. That central location could be in the attic, a crawlspace, a utility closet, or even outside in a package air conditioner. From there, ducts and vents move the newly conditioned air to everywhere else.

Centrality and ducts are the defining features of a central air conditioner. If you don't have ducts and rely on multiple condensers or air handlers, you don't have a central air conditioner. What you have might work, sure, but it's not central heating and air.

Package Unit vs Split System Central Air Conditioner

There are two main types of central air conditioner: package units and split systems.

Package Units

Central Air Conditioner Package UnitPackage (or packaged) units are the simplest. You buy one big cabinet and place it outside your house. That cabinet has the compressor, condenser coil, evaporator coil, fan motor, and everything else you need inside one single 'package'. It is connected to ductwork. Then, just turn it on, and it blows cool air into the ducts. You really don't have to do much else.



Split Systems

Central Air Conditioner Split SystemSplit systems are not so simple. Like a package unit, a split system central air conditioner will have an outside component. However, the other half of the split will be inside in an attic, crawlspace, or utility closet. The interior portion, the air handler, is connected to ductwork. The exterior bit, the condenser, is connected to the air handler via refrigerant lines and wiring.


Learn More: What Is A Package Air Conditioner? Learn More: What Is A Split System Heat Pump? 

Compressor: The Heart of the Central Air Conditioner

The compressor is the one component in an air conditioner condenser that will make the most difference in terms of efficiency and performance. The more sophisticated the compressor, the better the performance.

Historically, most central air conditioner compressors have been single-stage. A single-stage compressor is simple. It turns on or off at full capacity. It does the job. Single-stage compressors are also cheap.

Which is nice.

However, if you want to save money, the best way to do that is with a two-stage or a variable-speed compressor.

A two-stage compressor has two possible operating speeds. They operate at the lower setting as much as possible, then activate the second stage when necessary in hot weather.

A variable-speed compressor takes two-stage technology to the next logical step. They feature multiple operating stages, and the ability to ramp performance up or down based on need.  They are highly efficient, but, of course, new technology is never as cheap as the old stuff.

Seasonal Energy Efficiency Ratio

Do you know the SEER of your current central air conditioner?

No? We can't blame you too much. Seasonal Energy Efficiency Ratio (SEER) isn't exactly the most compelling topic. But, if you like money, it is very important.

SEER is a measure of how efficiently any given air conditioner, central or otherwise, will operate over the summer cooling season. The higher the SEER, the lower your utility bill. Government efficiency standards step up every few years, so current central air conditioner units are often higher SEER than the best sellers from only a few years ago.

Learn More: EER to SEER Conversion

Central Air Conditioner Warranty Standards

What kind of warranty should you expect with a central air conditioner?

The standard anticipated lifespan of a typical central air conditioner is about 15 years. So, warranty protection that lasts ten years or so is fairly standard. Most respectable manufacturers will provide you with at least that much protection. Some might offer a lifetime warranty on the compressor too.

These days, one important thing that you need to keep in mind with a central air conditioner warranty is registration. Most manufacturers require you to register your product warranty by a certain date after installation. Usually, you have 90 days, which is plenty of time to fill out a simple online form.

Just make sure that you do it! Failing to register a warranty won't totally invalidate your warranty (in most cases), but it might cut ten years of coverage down to five. You want as much warranty coverage as possible, so register as soon as your new central air conditioner is up and running.

Learn More: HVAC Warranty Stuff You Should Know

Central Air Conditioner Top Sellers

Want More Information on Buying A Central Air Conditioner?

Let us know in the comments below! We'll do our best to update this central air conditioner buying guide with the answer to your question.

6 comments (view/add)
  • Imad Knio
    Imad Knio
    Posted on 6/11/2021

    We have home in St Paul Minneapolis, need to upgrade from R22 to 410a type unit, must change both condenser and evaporator, which is ducted type, suspended from ceiling, I will call you later today, early your time to discuss options.

    I will be installing this unit myself, and I like to purchase a remote type room thermostat, as the wiring is made for the old Honeywell type, with 3 wires only, in the wall.

    Unit is 1.5 tons.
    Thanks, and Regards,

  • Dan Danowski
    Dan Danowski from Ingrams
    Posted on 6/12/2021

    We look forward to hearing from you!

  • Adraine Gilmore
    Adraine Gilmore
    Posted on 8/31/2020

    I have an old trane XE90 2.5 ton. I know they don't make these anymore. Can you tell me which new Trane for inside and outside I need to get to replace my old unit? Thank you so, so much

  • Kyle
    Kyle from Ingrams
    Posted on 9/2/2020

    There are a number of options that might work, Trane or otherwise. Give us a call at 270-575-9595.

  • Stephen Burgett
    Stephen Burgett
    Posted on 7/26/2020

    I have purchased a new home in Boone Terre Mo, the Furnace and Air Conditioner was stolen it is a 1800 sq ft home its total electric, needs a new Hvac system a Trane system can you please let me know what size Furnace / Air conditioner ,and A coil , like to but complete system from you . My name is Steve my # 314-243-8960 thank you

  • Steven
    Steven from Ingrams
    Posted on 7/27/2020

    A member of our team will be calling you shortly to help.

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