Louisiana homeowners face a somewhat unusual situation every October. Although the calendar says that fall has arrived, many Louisiana homes may still rely heavily on air conditioning. This isn’t necessarily a cause for alarm. Heat and humidity tend to remain high well into the season, especially across Baton Rouge and South Louisiana. Consequently, the need for both cooling and moisture removal can remain long after summer.
An air conditioner that runs constantly may be normal under certain conditions. But it can also signify an underlying problem. We recommend having an AccuTemp technician perform a series of performance and operational checks if your system can’t maintain optimal cooling temperature, runs abnormally, or shows other signs of malfunction.
Louisiana Fall Weather Can Still Keep Your AC Busy
Louisiana doesn’t generally experience the same sharp cooling transition as many northern areas in the fall, which is why many homes still experience long cooling cycles. This doesn’t mean that your system is about to fail. The following factors can all cause your cooling system to keep running:
- Warm daytime temperatures: Especially warm afternoons can cause elevated indoor temperatures well into evening.
- High humidity: Moist air further adds to the load on your system, affecting its ability to cool your interior.
- Solar heat gain: Sunlight coming in through windows and heating up roofs can have a cumulative heating effect inside your home.
- Household activity: Cooking, taking hot showers, and doing laundry further contribute to indoor heat and moisture.
- Thermostat settings: Turning your AC too low makes it harder for the system to cool your interior.
Check Your Thermostat Settings
If your AC runs constantly, check the following settings:
- Cooling mode: Make sure the system is set to ‘cool’.
- Set temperature: A very low setting can keep the system running for hours.
- Fan setting: Make sure the fan is set to “auto”, which keeps it running only while cooling.
- Programming or schedules: Ensure that your system’s cooling schedule or other settings haven’t been changed inadvertently.
Check the Air Filter
A heavily clogged filter can restrict airflow through the home. If your filter is visibly dirty and you can access it easily, try clearing out the dust and grime. If you have to disassemble your unit to reach the affected components, it’s best to call a professional to do the job safely.
Common Reasons an AC Runs Constantly
After you’ve ruled out improper settings and a dirty filter, the problem may be one or more of the following:
High Indoor Humidity
Excess moisture makes a home feel warm even when the thermostat is set correctly, leading to longer run cycles.
Restricted Airflow
Blocked vents, a dirty filter, or duct problems can reduce how much cool air reaches your room.
Dirty or Impaired Coils
Dirt or damage on the coils can reduce heat transfer, making the system struggle to cool the interior.
Refrigerant or Mechanical Problem
Low refrigerant or a failing component can explain why the AC keeps running but is not cooling the home.
Improper System Sizing
An undersized system may run nearly nonstop on extra warm days. Conversely, an oversized unit can short-cycle frequently, affecting its ability to remove moisture from the air.
Thermostat or Control Issue
A faulty thermostat or control system can misread temperature conditions or fail to shut the system off as normal.
Why Does Humidity Make an AC Run Longer?
Remember that an AC doesn’t only lower temperature. As warm air comes in contact with the evaporator coil, it retains moisture and drains it away. But given Louisiana’s high humidity, your AC may run longer to eliminate excess moisture. In some cases, it may be necessary to install a whole-home dehumidifier to take some of the load off your AC.
When Constant AC Runtime May Be Normal
Extended runtimes can be expected during extremely warm fall days or when there is a significant difference between the indoor and outdoor temperatures. You can also expect your AC to run longer than usual when humidity levels increase temporarily, such as after heavy rain or as the system adapts to an extreme change in the thermostat setting.
Signs Constant Runtime Needs Professional Attention
Of course, if your AC won’t stop running after you’ve ruled out the above-mentioned issues, it may be time to schedule a thorough system evaluation. Call AccuTemp for an inspection if you notice the following:
- Your interior never reaches the set temperature
- Weak airflow
- Ice on the equipment or refrigerant lines
- Unusual noises
- Excess indoor humidity
- A sudden change in energy use
- The system fails to cycle off even under moderate conditions
Can AC Maintenance Help?
Routine AC maintenance can help identify airflow, coil, electrical, drainage, and performance issues. However, it won’t necessarily shorten your system’s runtime or reduce your energy bill.
AC Service for Baton Rouge’s Long Cooling Season
Remember that long AC runtimes are often normal given Louisiana’s local conditions. Even so, it can be alarming to have your AC running all day, especially if it doesn’t cool your home sufficiently or indoor humidity remains high. To determine why your AC is running constantly, Louisiana’s local conditions and common mechanical issues must be ruled out by a professional evaluation.
AccuTemp’s technicians can perform such an evaluation as part of our air conditioning services. Call us to schedule AC service in Baton Rouge or book a site visit online to have a technician check your system.
Call us at (225) 244-8826
FAQ
Is it normal for my AC to run all day in Louisiana?
Continuous runtimes may be normal on warm, humid fall days or after a thermostat change.
Can high humidity make an AC run longer?
ACs remove moisture as they cool, so a heavy humidity load can extend run cycles.
Can a dirty filter make my air conditioner run constantly?
A clogged or dirty filter can reduce airflow and contribute to long cycles. Unless you’re experienced in filter cleaning and/or replacement, the job is probably better left to a professional.
Why does my AC run constantly but the house still feels humid?
Apart from an unusually high moisture load, your system may be struggling with airflow, coil performance, or sizing issues. An oversized unit can also short-cycle too frequently and fail to remove sufficient moisture from the air.
When should I call an HVAC technician about long AC cycles?
Call AccuTemp for assistance if your interior temperature never reaches the set level, or if you notice weak airflow and ice formation. You should also call for emergency AC repair if your system emits unusual noises or you experience a significant spike in your energy bill.
