Central Air Conditioner Buying Guide

central air conditioner
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. Simple!  

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

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Want More Information on Buying A Central Air Conditioner?

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Stephen Burgett
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
A member of our team will be calling you shortly to help.
Adraine Gilmore
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
There are a number of options that might work, Trane or otherwise. Give us a call at 270-575-9595.
Imad Knio
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, Imad
Dan Danowski
We look forward to hearing from you!
John Price
I am remodeling my home. I have 823 sq ft on my guest side with 10’ Clgs and 2785 on the master side with 10’ clgs and 2 vaulted rooms. I’m located in Madison Mississippi. I am going to used closed cell foam insulation in walls and rafters. I do have a 690 sq ft upstairs closet only. Would need some a/c but not main since it will be for seasonal cloths only and misc storage. I am ready to purchase asap. I was thinking a 2.5 ton on guest side and an5 ton on the master side. House is facing north but not crazy amount of windows.
Rebekah Muller
It seems that that could work, but we cannot definitively say whether it would work, as there are many factors that affect the size you need. You would need an HVAC professional to perform a Manual J load calculation on your home so you can truly know how many tons you need to properly cool your home.
Sharyn Dunlap
we have 2000 sq.ft.home. our outside unit is freezing up. I want a new unit.. Our furnace is in good condition.what is our best solution?
Rebekah Muller
There are many reasons that your unit may be freezing up, from it being dirty to it being broken. There are many factors that come into play when choosing a new HVAC unit. You may want to purchase a new air conditioning system if your furnace is your primary source of heat and is in good condition. You can find air conditioning systems at https://iwae.com/shop/heating-air-conditioning/full-systems/central-split-systems/air-conditioners/. You can also give us a call at 270-575-9595 so we can help you choose what best fits your needs.
Raffi Naveh
I have a Comfort Maker 4 Tons split A/C unit which was installed about 15 years ago. I need to replace the unit since I am losing F22. can I only replace only the outside unit ? will it work with the inside condenser? Thx so much
Rebekah Muller
While may be possible, you would likely need an HVAC professional to determine whether or not it would be a good match. It's possible that the efficiency of the unit would be compromised, because you will get the most efficient results if you replace both units at the same time.
Donna Heard
We are going to build a Barndominim.!! We need Air-conditioning and Heat for Home Space and Garage space ! I prefer a System when the air comes from ceiling. I feel like it preforms more accurately...And you don't have the system on the floor where debre collects in vents. What type of Your System would you think would be Best for our Home??? [email protected]
Rebekah Quarles
Would you rather have central heating and air, or a mini-split? You may want to call us at 270-575-9595 to discuss options over with one of our sales reps!
Carol Dailey
I am in need of HVAC unit my is going out and I need to know how much one one cost I have a trans 2 tin
Rebekah Quarles
Please give us a call at 270-575-9595 so that one of our sales reps can assist you!
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