How Long Can an AC Run Continuously?

May 15, 2026

Technically, a central AC can run 24/7, but it usually shouldn’t. In standard summer weather, a healthy unit cycles for 15–20 minutes, two to three times per hour. If your AC runs for hours without stopping, it may be due to an undersized unit, dirty filters, or extreme outdoor heat. Whether you own your home or you’re renting, odds are that your air conditioner is one of the most important appliances in your home during the hot summer months in O’Fallon, MO. Not only does it keep the indoor temperature comfortable, but it also helps remove humidity from the air. However, some air conditioning systems have a limit on how long they can run continuously. This raises the question: How long can an air conditioning unit run continuously before it needs to be shut off? The answer depends on the type of unit. Contact Us Today for AC Service! Troubleshooting Diagnostic Table Symptom Is It Normal? Potential Cause Running for 20 minutes, then off for 10 ✅ Normal Standard cooling cycle Running all day when it is over 100°F outside ⚠️ Usually Normal The system is working against extreme heat Running constantly when it is 75°F outside ❌ Problem Dirty...

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Cooling vs Moisture Control: Why Dehumidifiers Matter in Missouri

May 2, 2026

Missouri summers bring more than heat. They bring high humidity that can make you feel sticky and uncomfortable. You rely on your air conditioner to keep the temperature bearable. An AC system does remove some humidity, but it can’t always control moisture levels effectively on its own. Understanding the difference between cooling and dehumidification can help you create a more comfortable home and avoid overworking your HVAC system during summer. Cooling and Moisture Control Are Not the Same Thing It’s easy to assume that lowering the temperature will solve comfort issues, but humidity is equally important. When moisture levels rise, your body can’t cool itself efficiently because sweat evaporates more slowly. This makes the air feel warmer than it is, even if your thermostat shows a comfortable setting. Your air conditioner focuses on reducing the temperature. It removes some moisture as a byproduct of cooling, but that process depends on how long the system runs. In many circumstances, it may not run long enough to remove humidity. This creates a situation where your home feels cool but still damp. A dedicated dehumidifier can target the moisture more effectively. What Your AC Can and Can’t Do Your air conditioner’s primary function...

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From Heating to Cooling: Getting Your Geothermal System Ready for Summer

May 1, 2026

If you rely on a geothermal system, you already benefit from one of the most efficient heating and cooling methods available. As the seasons change, your system shifts from heating your O’Fallon, MO home to removing heat, which requires a different level of performance. Preparing your geothermal system for summer allows it to take full advantage of the ground’s natural ability to absorb heat and keep your home comfortable during warmer months. How Geothermal Systems Transition from Heating to Cooling A geothermal system operates differently than traditional HVAC systems because it uses the stable temperature of the ground rather than the variable outdoor air temperature. During winter, the system pulls heat from the ground and transfers it into your home. As temperatures rise, the system reverses this process. In cooling mode, your geothermal system removes heat from inside your home and transfers it into the ground. This process relies on a reversing valve that changes the direction of heat transfer. Instead of collecting heat, the system releases it. This transition does not require major adjustments, but the system must be efficient to be able to handle the increased cooling demand. Preparing your system before summer begins helps it perform as...

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You May Qualify for Federal HVAC Rebates and Tax Credits

April 8, 2026

It’s no secret that modern heating and AC units cost a pretty penny. When you decide to upgrade the HVAC in your O’Fallon, MO home, it is a large investment. Even if you take advantage of a company’s financing, the expense is still considerable. Long-term savings from lower energy usage eventually offset these costs, and while you’re waiting, you can find a slew of federal tax credits and rebates for new HVAC equipment. At , we want you to be as informed as possible in terms of your HVAC options. The government frequently adds incentives to reward you for going green. To help you navigate this topic, we have created this guide that illustrates various benefits for homeowners. The Energy Efficient Home Improvement Credit (25C) The most accessible benefit you’ll likely find is the 25C, short for the Energy Efficient Home Improvement Credit. Recent legislation has reauthorized and expanded this credit. Specifically, it credits you with a percentage of your equipment costs to reduce your federal income tax. Your equipment just has to meet current energy-efficient standards. Unlike a deduction, a credit does not lower your taxable income. Instead, a credit gives you a 1:1 match for your tax liability....

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How Photocatalytic Oxidation Helps to Improve Indoor Air Quality

April 1, 2026

For a long time, HEPA filters reigned as the gold standard in air purification technology. Their reputation is well-earned. However, they have drawbacks that prevent them from being a complete air quality solution. That is where air purifiers come into play. Today, the latest air purification systems use photocatalytic oxidation to clean your air. Here is everything you need to know about the technology and how it can help keep your home’s air healthy. The Limitations of HEPA Filtration HEPA filters do not kill microorganisms like viruses and bacteria; they merely trap them. As a result, if you fail to replace a HEPA filter on time, you risk allowing microorganisms to continue circulating. Many whole-house HEPA filtration systems need filter replacements annually. Some need new filters more often than that. And if you are not careful when handling a used filter, you can reintroduce contaminants into your air. HEPA filtration systems and their filters can be costly. As a result, you will find them most often in sensitive environments, such as hospitals. But they are more of an option of last resort in residential settings. What Is Photocatalytic Oxidation? Although it sounds complex, photocatalytic oxidation is a straightforward process. It...

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How to Troubleshoot Strange Noises Coming From Your HVAC System

March 10, 2026

Modern residential HVAC systems are impressively silent. You may notice a whoosh or a click when a system cycles on, but that should be about it. Louder and persistent noises are often the telltale signs of an underlying malfunction. Even minor issues can lead to higher energy bills and bigger repair costs down the line. Let’s explore some of the most common HVAC noises, what may be causing them, and what you should do about them. Whistling An airflow-related whistling sound is usually due to the HVAC filter or a supply register. It may mean that the air is moving around the filter rather than through it. This can happen because you’re using a clogged filter. The average household has to replace its HVAC filter every one to three months. Otherwise, it will eventually become saturated. Whistling can occur when the filter dimensions are too small for your return register. Another potential issue is the minimum efficiency reporting value (MERV). The industry uses this rating to evaluate HVAC filters. The higher the MERV rating, the better the filtration, but also the higher the airflow restriction. If the MERV rating is higher than what your system supports, it’s effectively the same...

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Paws and Airflow: Essential HVAC Maintenance Tips for Pet Owners

March 3, 2026

All pet owners want to do right by their pets, and a big part of this is making sure they’re comfortable at home. Maintaining your HVAC system and improving your indoor air quality can allow you to do that. Many irritants that bother humans can also affect pets. There are several easy HVAC maintenance tips that can help you create a safer, cleaner, and more comfortable environment for all of you. Change or Clean Your Air Filter Cleaning or changing your air filter is important for both your indoor air quality and your HVAC system. When the filter gets clogged, your unit doesn’t work efficiently. This could strain it, increasing the risk of problems and decreasing its lifespan. Additionally, a clogged air filter traps fewer contaminants, allowing them to recirculate into the air, where you and your pets breathe them in. Some units have a reusable filter while others have a disposable one. Before cleaning or replacing the filter, start by turning off the system. If your system has a reusable filter, remove it, wash it carefully, let it dry completely, and put it back in. It’s best to do this at least every few weeks. For disposable filters, take...

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How to Install an HVAC System in an Old Home

February 13, 2026

Old homes are beautiful but outdated, and they require multiple upgrades to fit a modern lifestyle. For instance, you’ll need to upgrade the HVAC system to improve your home’s year-round comfort. Furthermore, upgrading the HVAC system extends its lifespan and reduces your energy costs. Fortunately, in O’Fallon, MO, can upgrade HVAC systems in older homes. Challenges for Installing HVAC Systems in Older Homes Damage Hidden Behind the Walls Whether you’re moving into an older home or residing in your childhood home, consider the damage behind the walls. For example, a past remodel may cover up outdated duct runs. Poor ventilation may lead to trapped moisture and rotted wood in your attic. You may not know about the damage until a technician inspects your home. We can help point you in the right direction, allowing you to prepare for your new HVAC system. Outdated Features That Need Upgrading When a technician inspects your home, they’ll look for outdated features. This includes a small panel that can’t support a high-capacity heat pump or framing that can’t hold modern ductwork. While these challenges may slow down your project, our team knows how to work around them. Our goal is to catch these issues...

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Your HVAC System and Mold Prevention

February 6, 2026

Mold is a very dangerous and expensive problem to face in your O’Fallon, MO home. Luckily, there are steps you can take to prevent mold, including using your HVAC system for support. Heating systems do a great job of maintaining a comfortable temperature in your home. However, they can also be used to control relative humidity, which should remain between 35% and 50%. Count on us at to help with HVAC maintenance, repairs, and upgrades to ensure you can maintain a healthy and comfortable living environment. The Basics of Mold Growth For mold to grow and thrive in a home, it must have moisture, organic materials, and warmth. Unfortunately, these three things are usually present in a home. In the wintertime, indoor temperatures are ideal for mold growth. The food sources for mold to grow include dust, wood, and drywall. Moisture can come inside from the outdoors through cracks and gaps, windows, and doors. Our indoor humidity levels also rise when we shower or bathe, cook, clean, and use our washing machine. Your HVAC system can help control humidity, but it can also cause problems. Mold is likely to grow when humidity levels are too high and condensation forms inside...

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Is Your HVAC System Causing Dry Indoor Air?

January 28, 2026

One of the biggest complaints homeowners have during the winter is dry indoor air. Dry air leads to issues like dry eyes, itchy skin, frequent nosebleeds, and static shocks. While the weather outside definitely plays a role in your indoor humidity level, so can your HVAC system. We’ll explain how your HVAC system can affect your indoor air quality (IAQ) and what you can do to improve your comfort this winter. How Relative Humidity Affects Your Home and Comfort When humidity levels are too low, your nasal passages can dry out. This can irritate your respiratory system, worsen your allergy symptoms, and lead to symptoms like fatigue and headaches. Dry air will dry out all the wood materials throughout your home, including furniture, trim, and so forth. Low humidity makes it harder for heat to linger in your air. This can make your home feel colder than it actually is. Conversely, high indoor humidity can lead to mold and mildew growth that can be toxic to your health. Relative humidity is the amount of water vapor in the air compared to the maximum amount the air can hold. Most experts agree that the ideal indoor relative humidity level is between...

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