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What the Ideal Humidity Level Should Be in a House with Air Conditioning

What is the ideal humidity level for a home with air conditioning? Central air systems are designed to keep the humidity in your house at a certain level, but what is that level?

Humidity levels can vary depending on the time of year and where you live.

In this article, we will explore what the ideal humidity level should be for a house with central air. We will also discuss how to adjust your humidifier settings to achieve that level.

The Answer May Surprise You

Humidity levels inside your home can have a big impact on your comfort. Humidity that is too high can cause stuffiness, sweating, and increased risk of mold and mildew growth. On the other hand, humidity that is too low can cause dry skin, static electricity, and respiratory problems. So what is the ideal humidity level for a house with air conditioning?

The ideal humidity level for a house with air conditioning is actually higher than you might think. In fact, the ideal relative humidity for a home with air conditioning should be between 30-50%. That’s because when the temperature outside is hot, the air conditioner will remove more moisture from the air than usual in order to keep the house cool. This is doubly so in the desert, which can cause the indoor air to feel dry and uncomfortable. By raising the humidity level inside your home, you can offset this effect and make the air feel more comfortable.

Two Ways To Adjust Humidity

If you have a central air system, there are two ways to adjust the humidity level: by using a humidifier or by adjusting the settings on your AC unit. If you decide to use a humidifier, be sure to choose one that is sized properly for your home and set it to run only when the air conditioner is running. You don’t want to overdo it – too much moisture in the air can lead to mold and mildew problems.

If you would rather adjust the settings on your AC unit, most units have a humidity control setting that you can use to raise or lower the level of humidity in your home. Simply set the Humidistat to your desired level and the AC unit will do the rest.

Unable To Control Your Humidity? Routine air conditioner maintenance includes:

  • Checking air filters
  • Checking electrical amp pulls
  • Checking evaporation and condenser coils for cleanliness
  • Checking temperature splits
  • Checking electrical connections for weak wire connections
  • Checking freon levels

Okay...But What Exactly Is Humidity?

Humidity is the amount of water vapor in the air. Water vapor is invisible, but it’s present in the air around us all the time – even when it doesn’t feel humid outside. The amount of humidity in the air can range from 0% (dry desert air) to 100% (humid tropical air).

The temperature of the air also affects how much water vapor it can hold. Warm air can hold more water vapor than cold air. That’s why you often feel more comfortable in a humid climate – the warmer temperatures mean that there is more water vapor in the air to keep you cool.

So what is relative humidity? Relative humidity (RH) is a measure of how much water vapor is in the air compared to how much water vapor the air can hold at a given temperature. For example, if the air is holding all the water vapor it can possibly hold at a certain temperature (100% RH), then the relative humidity is also 100%. If there is half as much water vapor in the air as it could potentially hold (50% RH), then the relative humidity is also 50%.

Relative humidity is usually expressed as a percentage. The higher the percentage, the more humid it feels outside. For example, 80% RH means that it feels quite muggy outside, while 30% RH means that it feels relatively dry.

Dangers Of Low Humidity

While high humidity levels can be uncomfortable, low humidity levels can actually be dangerous. That’s because when the air is too dry, it can cause a number of problems:

  • Dry skin: When the air is too dry, it can cause your skin to become dry and cracked. This can lead to an increased risk of infection.
  • Static electricity: Have you ever noticed that your hair stands on end when you walk across a carpet in winter? That’s because static electricity builds up in dry air. While this may just be annoying, it can also be dangerous – static electricity can cause fires if it ignites flammable materials like gasoline or dust particles.
  • Respiratory problems: Dry air can also cause respiratory problems like bronchitis, sinus infections, and nosebleeds. That’s because the mucous membranes in your nose and throat need moisture to stay healthy. When the air is too dry, these membranes become dried out and irritated, making you more susceptible to infection.
  • Furniture damage: Low humidity levels can also damage your furniture. That’s because wood tends to shrink in low humidity environments. This can cause cracks and splits in your furniture that are difficult (and expensive) to repair.


  • American Standard
  • RUUD
  • Rheem
  • Carrier

These are the air conditioning brands we’ve worked with in the past. We’ve also worked with other AC brands as well. If you recently bought a new AC unit from a brand not on our list, contact us and we will let you know what we can do for you. Our team is always expanding our knowledge and we may be able to service your air air conditioner even if it isn’t listed here. If you currently have an air conditioner that isn’t manufactured by a company we’ve mentioned give us a call and we can send one of our air conditioner technicians to examine the air conditioner and give you a quote if we are able to install it for you. 

Find The Right AC Unit For Your Home

Not all air conditioners are created equal. If you’re looking for an AC unit that can help you maintain the ideal humidity level in your home, it’s important to choose one that has a built-in humidifier. This type of AC unit will not only keep your home cool, but it will also help to add moisture to the air, keeping your indoor environment comfortable and healthy.

If you don’t have a built-in humidifier, there are a few other options available:

  • Portable Humidifiers: Portable humidifiers are small devices that can be used to increase the humidity levels in a single room. They are relatively inexpensive and easy to use, making them a great option for small homes or apartments.
  • Whole House Humidifiers: Whole house humidifiers are larger devices that are installed directly into your HVAC system. They work with your AC unit to add moisture to the air throughout your entire home. This is a great option for larger homes or for people who suffer from allergies or respiratory problems.
  • Drip Humidifiers: Drip humidifiers are similar to whole house humidifiers, but they use a drip system instead of being installed into your HVAC system. This makes them less expensive and easier to install, but they may not be as effective at adding moisture to the air in your home.

Now that you know what the ideal humidity level should be for a house with air conditioning, you can take steps to ensure that your home is comfortable all year long. Be sure to adjust your humidifier or AC settings as needed to maintain a relative humidity between 30-50%. With proper humidity levels, you can enjoy cool, comfortable air all summer long – without any of the negative side effects.

Maintenance & Installation - We are here to help!

You can trust Lee Collins Air Conditioning to quickly repair your air conditioner with new replacement ac parts and keep your home comfortable 24/7. Our technicians have been with us for over 25 years and have amassed over 60 years of experience in air conditioning.

Have questions? We have answers! Give us a call directly at 602-805-1348 or schedule an introductory service call by clicking the button below.