If your home feels stuffy and damp even when the AC is running, or if you notice condensation on your windows or a musty smell that just will not go away, humidity is likely the problem. In Monroe and throughout north Louisiana, managing indoor moisture levels is one of the most important and least talked about parts of keeping your home comfortable year-round.
This guide explains what indoor humidity should be, why it matters, what happens when levels get too high or too low, and what you can do to get things under control.
What Is a Good Humidity Level Inside a House?
The ideal indoor relative humidity for a home is between 30% and 50%, with most comfort and health guidelines pointing to around 45% as the sweet spot during warmer months.
Relative humidity is a measure of how much moisture the air holds compared to how much it could hold at a given temperature. At 100% relative humidity, the air is fully saturated and moisture starts condensing on surfaces. At 0%, the air is completely dry, which brings its own set of problems.
In Monroe, the bigger concern for most of the year is humidity that runs too high rather than too low. Louisiana’s climate pushes outdoor relative humidity into the 70 to 90% range during spring, summer, and fall, and that moisture finds ways into your home.
Why Indoor Humidity Matters
Humidity affects more than just how comfortable you feel. It directly impacts your health, your home’s structure, and how efficiently your HVAC system runs.
Comfort
The human body cools itself by sweating. When the air around you is already saturated with moisture, sweat cannot evaporate effectively, and you feel hotter than the actual temperature. This is why an 85-degree day in Monroe feels far more oppressive than an 85-degree day in a drier climate. The same effect happens inside your home. At 65% indoor humidity, a room set to 74 degrees can feel closer to 80.
Health
High indoor humidity creates conditions where mold, mildew, and dust mites thrive. All three are common allergen triggers and can worsen asthma, sinus congestion, and respiratory issues. Mold growth can begin on surfaces within 24 to 48 hours when humidity stays above 60%. Dust mites, a major cause of year-round allergy symptoms, reproduce most rapidly when humidity is above 50%.
Low humidity, which is more of a concern during Monroe’s brief winter months, causes dry skin, irritated nasal passages, sore throats, and increased susceptibility to viruses. Viruses tend to survive longer and spread more easily in very dry air.
Your Home
Excess moisture is hard on building materials. Wood framing, flooring, cabinetry, and trim absorb moisture and expand, which leads to warping, swelling, and cracking over time. Paint blisters. Drywall softens. Insulation loses effectiveness when it becomes damp. In a climate like Monroe’s, chronic high indoor humidity can cause real structural damage over years if it is not managed.
Your HVAC System
Your air conditioner removes humidity as a byproduct of cooling. Air passes over the cold evaporator coil, moisture in the air condenses on the coil, and that condensate drains away. But your AC was sized to handle your home’s cooling load, not necessarily your home’s moisture load. A system that is oversized for the space cools too quickly and shuts off before it can complete a full humidity removal cycle, leaving the air cool but damp.
What Causes High Indoor Humidity in Monroe?
Several factors can push indoor humidity above the comfortable range:
Outdoor air infiltration. Gaps around doors, windows, attic hatches, and utility penetrations allow humid outdoor air to seep in continuously. North Louisiana summers mean that outdoor air entering your home carries a significant moisture load.
Oversized air conditioning equipment. An AC system that is too large for the home short-cycles, running brief blasts of cooling without running long enough to pull meaningful moisture out of the air. If your home feels cool but sticky, an oversized system is one of the first things to suspect.
Poor ventilation of moisture-generating spaces. Bathrooms, kitchens, and laundry rooms generate substantial moisture through daily use. If exhaust fans are undersized, non-functional, or vented into unconditioned spaces rather than outside, that moisture spreads through the home.
Crawl space or slab moisture. Homes with crawl spaces can draw significant ground moisture upward into the living space if the crawl space is not properly sealed and ventilated.
A neglected or failing HVAC system. A dirty evaporator coil, low refrigerant, or a failing blower motor reduces your system’s ability to remove moisture from the air. Regular AC tune-ups help ensure your system is actually doing its job.
How to Measure Indoor Humidity
A hygrometer, also called a humidity meter, is an inexpensive device that measures indoor relative humidity. Basic models are available at hardware stores for $15 to $30 and give you an accurate reading in seconds. Many smart thermostats also display indoor humidity readings. If you have a newer thermostat installed, check whether it includes a humidity readout.
Taking readings in different rooms at different times of day gives you a more complete picture. Bathrooms, kitchens, and basements typically show higher humidity than other areas.
How to Control Indoor Humidity in Monroe
Run Your AC Properly
Your central air conditioning system is your primary humidity control tool during Monroe’s long cooling season. For it to remove moisture effectively, it needs to run long enough for the evaporator coil to get cold and for condensate to form and drain. Short cycles do not accomplish this.
If your system seems to be short-cycling, it may be oversized, have a refrigerant issue, or have a dirty coil. An AC repair visit can identify the cause.
Add a Whole-Home Dehumidifier
When your AC alone cannot keep up with Monroe’s humidity load, a whole-home dehumidifier is the most effective solution. Unlike portable room dehumidifiers, a whole-home unit installs in-line with your existing ductwork and treats air throughout the entire house as it circulates through the system.
Whole-home dehumidifiers are particularly valuable during the shoulder seasons, spring and fall, when outdoor temperatures are mild enough that you are not running the AC heavily but humidity is still high. They can also run independently of the AC, maintaining target humidity levels even when cooling demand is low.
Seal Air Leaks
Reducing the amount of humid outdoor air entering your home reduces the total moisture load your system has to handle. Common entry points include door and window weatherstripping, attic hatches, electrical outlets on exterior walls, and gaps around plumbing and electrical penetrations.
Use Exhaust Fans Consistently
Run bathroom exhaust fans during every shower and for at least 20 minutes afterward. Make sure kitchen exhaust fans vent to the outside and use them when cooking. These habits alone can meaningfully reduce the amount of moisture added to your indoor air each day.
Consider a Ductless Mini Split for Problem Zones
Ductless mini splits with variable-speed compressors are outstanding at humidity control. Because they run at lower speeds for longer periods rather than cycling on and off aggressively, they keep the evaporator coil cold for extended stretches and pull more moisture out of the air per hour of operation than most traditional systems. For rooms that always feel damp, a mini split can make a dramatic difference.
Schedule an Indoor Air Quality Assessment
If you are struggling with humidity and are not sure where the problem is coming from or how bad it actually is, an indoor air quality assessment gives you a clear baseline. Our technicians measure humidity levels throughout your home, identify problem areas, and recommend solutions that fit your home’s specific situation.
What If Indoor Humidity Is Too Low?
Monroe winters are mild and short, but during cold spells when heating runs frequently, indoor humidity can drop. Below 30% relative humidity, you may notice dry, irritated skin, static electricity, increased respiratory discomfort, and cracking in wood furniture and trim.
A whole-home humidifier can add moisture back to the air, but this is rarely a persistent problem in north Louisiana’s climate. Portable humidifiers in individual rooms are usually sufficient for the brief periods when dry air is a concern here.
Ready to Get Your Home’s Humidity Under Control in Monroe?
Southern Air has been serving Monroe since 1984. Whether you need a dehumidifier installed, an AC tune-up to improve your system’s moisture removal, or a full indoor air quality evaluation, our team will give you honest answers and upfront pricing.
Call us at (318) 310-1628 or schedule online today.
