The Health Effects of AC: What You Should Know

Date: 07-01-2025

Is Your AC Helping or Hurting Your Health?

At the height of the tuberculosis epidemic in the 19th century, doctors urged patients to get outside and breathe fresh air to avoid the "bad air" trapped indoors. Fast forward to the 1960s, and air conditioning was gaining popularity in the U.S., encouraging people to stay comfortably inside. Today, most of us, now part of the so-called "indoor generation," spend our summers tucked away indoors, relying heavily on air conditioning to stay cool.

At Mid-State Heating and Air LLC, we know firsthand that air conditioning is more than just a luxury it's a critical health tool. During extreme heat waves, a properly functioning AC system can literally save lives. But just like those 19th-century physicians suspected, there can be downsides to stale or poorly managed indoor air. Let’s take a closer look at how AC can both help and potentially hurt your health—and what you can do to ensure your system works for you, not against you.

The Many Benefits of Modern AC Systems

Air conditioning is essential in protecting vulnerable individuals from heatstroke and other heat-related illnesses. According to the CDC, heat-related deaths in the U.S. doubled between 1999 and 2023, proof that reliable indoor cooling is more important than ever.

But AC systems do more than cool you down. A properly maintained unit also filters out dust, pollen, and airborne contaminants. At Mid-State Heating and Air LLC, we often remind homeowners that good air quality starts with your HVAC system. Quality filters can trap particles, allergens, and even fine particulate matter (PM2.5), which is linked to heart and lung disease and commonly found in vehicle exhaust and wildfire smoke.

AC also helps by reducing humidity levels indoors. Less moisture in the air means less mold growth, fewer dust mites, and a lower risk of bacteria-related issues like pneumonia or asthma flare-ups. In South Carolina's hot, humid summers, managing indoor humidity is especially crucial.

The Flip Side: Can AC Be Too Much of a Good Thing?

Absolutely. Overuse of AC can create an overly dry environment, irritating the respiratory system and potentially leading to "sick building syndrome." When the air is too dry, your body compensates by releasing moisture with every breath. Over time, this can dry out your airways, weaken your lungs' natural defenses, and make you more susceptible to viruses, especially among children and those with compromised immune systems.

To avoid this, Mid-State Heating and Air LLC recommends keeping indoor humidity levels somewhere between 40% and 60%. Installing a hygrometer (humidity sensor) is a smart move, and many affordable models are now available. If your levels dip below 40%, consider turning down the AC. If they rise above 60%, it's time to turn it up or run a dehumidifier.

Routine Maintenance Makes a Big Difference

Your AC system might be running, but is it working for your health? Poor maintenance can turn your unit into a breeding ground for bacteria, mold, and allergens. That’s why Mid-State Heating and Air LLC encourages homeowners to change filters regularly every 1–2 months during peak usage. We suggest using filters that carry a MERV rating of 11 and higher to trap more harmful particles.

Beyond filters, scheduling annual maintenance is key. Our HVAC technicians at Mid-State Heating and Air LLC inspect your system’s coils, ductwork, and interior components to ensure everything stays clean and efficient. After any water leak or indoor moisture issue, a thorough inspection is especially important.

For added protection, consider installing a UV light in your HVAC system. These lights can disinfect the coil and kill mold and bacteria before they spread throughout your home. Just be sure to select a model with a UL or ETL safety certification.

Don’t Forget About Indoor Pollutants

Air conditioning helps with outdoor pollutants, but what about the toxins already inside your home? Volatile organic compounds (VOCs) are found in furniture, cleaning products, air fresheners, and more. These types of chemicals often irritate the eyes, nose, and throat, and may even lead to hormonal disruptions or long-term health problems.

To combat VOCs, crack open your windows occasionally, especially on cooler days. You may also want to consider investing in a HEPA air purifier with a carbon filter to reduce chemical exposure. We also recommend using low-VOC products where possible and avoiding synthetic air fresheners.

Keep Your Home Cool and Healthy

Every home is different, and the air inside it is just as unique. At Mid-State Heating and Air LLC, we believe that a well-balanced, well-maintained HVAC system is one of the most important steps toward a healthier home environment.

From filter changes and humidity control to full system inspections and air purification upgrades, our team is here to help you breathe easier, literally. Don’t wait until your unit stops blowing cold air to schedule a service. Preventive maintenance can extend the life of your HVAC system and protect the health of everyone in your home.

Need help optimizing your AC for comfort and health? Contact Mid-State Heating and Air LLC today for a maintenance check or air quality assessment.