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When summer heat settles in along the Mississippi Gulf Coast, your air conditioner can become one of the biggest reasons your electric bill climbs. Even if your daily routine hasn’t changed much, your energy bill may look very different once your cooling systems start running for hours at a time.
The good news is that high summer energy costs usually have a clear cause. Once you understand what’s driving your energy usage, you can make smart changes that help you save energy and reduce strain on your HVAC equipment.
In the summer, your air conditioner has to remove heat from your indoor space again and again throughout the day. When outdoor temperatures stay high, your system may run longer cycles to keep delivering cool air, and that extra runtime naturally raises your electric bill.
And in coastal Mississippi, your air conditioning system also helps pull moisture from the air. When humidity is high, your space can feel warmer than the thermostat says, which may tempt you to keep lowering the temperature.
If your AC is running but the air still feels warm, there may be a bigger issue. Learn what could be happening when your AC isn't blowing cold air.
Lowering the thermostat too much can make your cooling system work harder than necessary. Your AC doesn’t cool faster because you set the temperature several degrees lower. It just keeps running until it reaches that setting.
Try adjusting the thermostat a few degrees higher when you’re away, sleeping or spending time in rooms that naturally stay cooler. You can also set your thermostat around your schedule with a programmable or smart model.
The Department of Energy often recommends using thermostat settings strategically, sealing air leaks, improving insulation and maintaining HVAC equipment to reduce wasted energy. These steps can help your systems work more efficiently during peak cooling season.
Your HVAC filter has a simple but important job. It catches dust, pollen, pet hair and other particles before they move through your system. When that filter gets clogged, airflow drops. Your AC has to work harder to push air through, which can raise your energy costs.
Changing filters regularly is one of the easiest ways to help your system run better. During heavy summer use, check your filter more often than you would in cooler months. A clean filter helps protect your equipment, supports better indoor air quality and keeps cool air moving through your vents.
Even a small AC issue can affect your summer energy usage. Dirty coils, low refrigerant, worn electrical parts, blocked drain lines and weak airflow can all reduce performance. When your system isn’t operating properly, it may run longer and use more electricity to do the same job.
Routine maintenance helps catch these issues before they turn into expensive repairs. It also helps your cooling systems stay dependable during heat waves, when breakdowns are more likely to happen because your AC is under extra stress.
If you want to prepare your system before the hottest stretch of the season, here’s how maintenance helps during heat waves.
Ceiling fans don’t lower the room temperature, but they can make you feel cooler by moving air across your skin. That breeze may let you raise the thermostat a degree or two while staying comfortable.
Just remember to turn fans off when you leave the room. Fans cool people, not empty spaces. Leaving them on all day adds to your energy usage without giving you much benefit.
You should also make sure vents aren’t blocked by furniture, curtains, rugs or storage. Clear vents help your air conditioning system move cooler air more evenly.
Your HVAC system usually has the biggest impact on your summer electric bill, but it isn’t the only thing using power. Your water heater, oven, clothes dryer, lights, chargers, TVs, computers and gaming systems can all add to your total energy usage.
Some electronics still draw power in standby mode. Unplugging devices you don’t use often, using power strips, washing clothes with cooler water and running heat-producing appliances later in the evening can help you save money over time.
Cooking outside or choosing meals that don’t heat up the kitchen can also reduce the cooling load on your AC. Less indoor heat means your system doesn’t have to fight as hard to keep you comfortable.
Parts wear down, airflow can weaken and the system may need more electricity to keep up with summer demand. If your AC is older and your energy costs keep rising, it may be time to have it inspected or replaced.
A technician can help you decide whether a repair makes sense or if replacement would be the better long-term option. The right answer depends on the age of your system, the cost of the repair, your comfort concerns and how often problems keep coming back.
Leaky, dirty or poorly connected ducts can waste conditioned air before it reaches your rooms. That means your AC may be doing the work, but you’re not getting the full benefit.
Signs of duct-related problems can include rooms that never cool properly, weak airflow from certain vents, musty smells or just higher bills without a clear explanation. Duct cleaning and inspections can help identify issues that affect comfort, indoor air quality and system performance.
| Cause of High Bill | Why It Increases Costs | Recommended Action |
| Increased Runtime | High outdoor heat and humidity force the AC to run longer cycles to maintain temperature. | Install a programmable thermostat and raise the temp while you are away or sleeping. |
| Thermostat Set Too Low | Setting the AC to a very low temp doesn't cool faster; it just makes the unit run indefinitely. | Set the thermostat to the highest comfortable temperature (DOE recommends 78°F). |
| Dirty Air Filters | Clogged filters restrict airflow, forcing the motor to work harder and draw more power. | Check filters monthly during summer; replace every 30-90 days. |
| Lack of Maintenance | Dirty coils or low refrigerant reduce efficiency, causing the system to struggle. | Schedule a professional AC tune-up once a year before the peak heat season. |
| Inefficient Fans/Vents | Blocked vents or fans running in empty rooms waste energy without cooling people. | Clear furniture away from vents; turn off ceiling fans when you leave the room. |
| Heat-Producing Appliances | Ovens and dryers add heat to your home, forcing the AC to fight harder. | Cook outdoors or use heat-producing appliances in the evening when it’s cooler. |
| Leaky Ductwork | Holes or gaps in ducts let cold air escape into the attic or crawlspace. | Schedule a duct inspection and cleaning to ensure air reaches your living spaces. |
| Aging AC Unit | Older systems lose efficiency over time and require more electricity to produce less cooling. | Consult a technician to compare the cost of repairs vs. upgrading to a high-efficiency unit. |
Replace your filter, check your thermostat settings, use ceiling fans wisely, keep vents clear and reduce heat from appliances when possible. These habits can help you save energy and make your space feel more comfortable.
If your electric bill still seems too high, your AC may need professional attention. Tillman’s Heating, Air Conditioning & Duct Cleaning provides AC maintenance, repair, installation, duct cleaning and indoor air quality services for customers in Harrison, Jackson and Hancock Counties. Schedule your service today to get help finding the cause of high summer cooling costs.