Why an Oversized Air Conditioner is a Serious Problem

Oversized Air Conditioner

Are you searching the market for a new air conditioning system? Then it is very important to have a professional HVAC company involved in the process from the very beginning. This would be beneficial not just for the HVAC system’s installation but also for you to have the correct size of unit for your home.  Although you must have heard the expression “bigger is better.” While this may be true for some pieces of equipment, it is not true for air conditioners. Selecting the wrong size air conditioner leads to many problems that are not easily fixed. Below we have explained why an Oversized Air Conditioner Is a Serious Problem

Problems With an Oversized Air Conditioner

Oversized Air Conditioner

Unfortunately, many homeowners end up purchasing an HVAC system that’s often too large for their homes to handle. A large air conditioner unit presents a number of problems that can be a nuisance. Resultantly, it can cause you to replace the unit years before its due time. Problems with an oversized air conditioner can affect your family for many years. Moreover, it can be costly to replace or fix.  If the air conditioner is too small, it will not provide the cooling that your home needs. If it is too large, it causes its own set of problems such as:

Reduced Home Comfort

An air conditioner cools the air in your home. It also is responsible to suck out the moisture and humidity from the house. To remove the moisture, the air has to pass over an evaporator coil, which is a very cold surface. When the air passes over that coil, the air temperature can drop by as much as 20°F. When the temperature of the coil is below the air’s dewpoint, water vapor condenses on the surface of the coil.            

However, if you have an oversized air conditioner installed, the air conditioning unit makes the room cool faster. As a result, it runs for a shorter period of time than an air conditioner that has been properly sized does. This means the water doesn’t condense on the coil and is carried back into the room. So although your room may be cooler, an oversized air conditioner results in that “sticky feeling. Thus it can be very uncomfortable for the inhabitants of the house. 

Reduced Air Quality

Due to the increased level of moisture produced by a large air conditioner, the air quality in your home can deteriorate. This can be a big problem for anyone with asthma or any other respiratory disease.

Dust Mites and Mold

The growth of mold is also a reason why an Oversized Air Conditioner Is a Serious Problem. If the humidity level will be high, it will be easier for dust mites and mold to grab a foothold in your home.

Higher energy bills

As an oversized AC will often cool your home really fast and then shut off. This does not only wear out your AC components, but it can raise your energy bills too. An AC has several motors and all these motors draw in more power when they start up as compared to when they are running. So if your AC is turning on and off frequently, the motors in your AC are using more power than they should. This resultantly raises your energy bills.

So, if you’ve noticed steadily increasing energy bills, you may have an oversized air conditioner.


A properly sized air conditioner makes very little noise or most often runs silently. If your air conditioner sounds like a freight train when it turns on. That’s a sure sign the air conditioning unit is too big for the space. After all, You do not want to spoil the pleasure of your cool house on a warm summer’s day by having to listen to a very noisy air conditioning unit.

Short Cycling Issues

An oversized HVAC unit blasts your home with cool air instead of cooling it down gradually. These continuous temperature swings prompt your HVAC system to start up and shut down in rapid succession. This is a condition commonly known as “short cycling.”

Short cycling can wreak havoc on your HVAC system if left unchecked. The constant and abrupt starting and stopping can add unexpected wear and tear to the compressor, blower fan motor, and other HVAC components.


An Oversized air conditioner costs more money than an appropriately-sized air conditioner. It also works inefficiently and may turn on and off several times throughout the day. Therefore, this costs more in terms of energy use, money, and wear and tear on the HVAC system. Greater use means more repairs and more money out of your wallet. 

Structural Damage

Since a large air conditioner unit does not remove enough moisture and humidity from the air, the moisture is left behind. This accumulated moisture can have very serious consequences for your home. It can affect your home furniture, wood, walls, paint, etc. 

Related: How do you Size a Commercial HVAC System 

How do you know if You Have an Oversized Air Conditioner?

Oversized Air Conditioner

There are a few things that serve as a clear indication that you have an oversized air conditioner installed at your home:

  • The best way to determine this is the moisture level in your home. If your home feels cool but “wet” and too humid, that is a definite sign that you have a large air conditioner unit.
  • Similarly, mold in your home is also a sign that there is something wrong with your air conditioner. 
  • If you witness your wall paint beginning to peel in rooms where it feels particularly sticky, you should consult an HVAC technician. They will evaluate if the problem is an oversized air conditioner.
  • Moreover, if you’re sneezing or coughing a lot when the air conditioning is on, this could be another sign.
  • If you’ve noticed steadily increasing energy bills, you may have a wrong sized air conditioner.
  • If someone in your home has asthma and you notice their breathing problems aggravate when the air-conditioning is running.

The best way is to have a professional HVAC technician inspect your home. They will evaluate and diagnose the issue and will provide you with an honest opinion about the cooling power of your system.

Call Alturas HVAC Contractors 

Now that you have understood Why an Oversized Air Conditioner Is a Serious Problem, contact Alturas HVAC contractors to solve this issue for you. Our HVAC company has been in the business of providing quality HVAC air conditioning installation and HVAC repair services in Los Angeles. We have a database of satisfied customers as we are the contractors you can count on.

If you’re building and installing a new one or are facing oversized ac unit problems,  we are here at your service. It is very important to us that you have the proper-sized HVAC air conditioning unit in your home. Our HVAC technicians make sure all of our customers have equipment that works efficiently and effectively all year long. 

Learn more about how we can help you install a new system or upgrade an older one. Furthermore,  if you need repairs to your current system, call us today at (323) 443-3443


How to correct oversized air conditioner?

Talk to a professional about adding ductwork: In some cases, installing additional air ducts to a portion of your home that isn’t air-conditioned (like the garage, for instance) can disperse the excess air of an oversized system. You’ll want to get an opinion from your trusted AC technician for this one.

Replace the air conditioner: This might not be what you want to hear, but sometimes the best option is to replace the system. While it is an expensive choice, when your home is comfortable and your energy costs are reasonable, you’ll be glad you made this decision.

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