What Should Humidity Be In House With Air Conditioning

By Ann Hills / a couple of years ago

Aside from temperature, humidity is an important factor to consider inside our home. Simply defined, humidity is the concentration of water vapor in the air. At home, it’s not enough to set the coolness or warmness of the circulating air. We should also factor in the humidity in the air to get the maximum comfort within our homes. What should be the ideal humidity in a home having an air conditioning unit?

 Stay within 30% to 60% Humidity Level

While different experts may have differing recommendations for the ideal humidity level inside our homes, they generally agree that the humidity levels should not go lower than 30% or exceed 60% under normal circumstances. There are varying reasons why this is so, and we’ll touch on them in the succeeding sections. Air conditioning (AC) unit doesn’t just function to keep us cool and comfortable, it can also help regulate the humidity level in our homes. AC servicing professionals at Billy aircon recommend having your AC unit regularly checked and serviced in order for it to work smoothly and keep your home temperature and humidity at healthy levels.

Also, the thermostat and fan regulators are important parts of the AC unit that need to be checked if functioning properly. The improper thermostat and fan settings can contribute to unhealthy humidity levels, which may cause health problems for the occupants of a home. Newer AC units have an effective automatic thermostat and fan setting for ideal humidity and coolness, while for older AC units, it is recommended to add a dehumidifier in your home to boost the humidity regulation function of your old AC unit.

What Happens if Humidity Gets Too Low?

If the humidity level inside your home falls below 30%, the air loses too much moisture and becomes dry. Low humidity and dry air can cause health problems such as itchy eyes, dry nose, and dry throats. Dryness in the nose and throat can lead to upper respiratory tract problems. Skin irritations are also triggered in people living under low humidity homes. People with dry and sensitive skin are most affected with very low humidity and it can exacerbate their existing skin conditions.

Things inside the house can get affected too. Wood is particularly affected, as it will shrink down at low humidity levels. Thus, wooden furniture joints may come loose due to prolonged low humidity levels. Drywall and plaster can also get cracked if the humidity level at home gets excessively low.

What Happens if Humidity Gets Too High?

High relative humidity levels mean there is a high concentration of water vapor in the air. High humidity levels can cause the accumulation of moisture at home. These can cause damp spots at certain places inside your home. These damp spots can become breeding grounds for molds. Molds are not only unsightly and very hard to remove they are also dangerous to our health. Mold spore exposure can cause respiratory problems, skin rashes, nausea, eye irritation and, headaches. Other disease-causing organisms such as fungi, mites, and mildew thrive on high humidity. Fungi and mites flourish at humidity levels exceeding 60%.

High humidity can be damaging to the home structure as well. High moisture content in the air can condense on windows and walls. Accumulating moisture in certain spots in the house can cause mold, wood rot and corroding furniture. Older electronic units are susceptible to moisture condensation and can break down or short-circuit as a result. Paints may also start to peel with excessive moisture and wood structure may become warped or damaged.


Humidity is sometimes an overlooked factor when it comes to comfortable home living. Most of us think that adjusting the temperature is already enough. When humidity is kept at ideal and recommended levels, you can experience multiple benefits not only in your health and well-being but also in maintaining the structure of your home and furniture.

About the author

Ann Hills

My name is Ann Hills and I am a food blogger and a yoga teacher. When I was a child, I often got around my mother and watched her cooking in our kitchen. My mom always says to me that: “Kitchen is the heart of any home”. I strongly believe in her saying that’s reason why I prefer spending my money to make my home better than other stuff.

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