Commercial HVAC

When your air conditioner isn’t cooling like it should, the problem often lies with your air conditioner evaporator coil. We see this component fail more than most homeowners realize. Understanding how it works can help you catch problems early. Your evaporator coil is essential to the entire cooling process. It quietly does its job inside your indoor air handler while absorbing heat from your home. At C&R Services, we want you to recognize when something’s wrong. Then you’ll know when to call us for help. What Is an Air Conditioner Evaporator Coil? Your air conditioner evaporator coil sits inside the indoor unit of your air conditioning system. It’s typically housed within the air handler or furnace cabinet. This A-shaped or N-shaped component consists of copper or aluminum tubing bent into multiple rows. Thin metal fins are attached to these tubes. Refrigerant flows through these coils, and that’s where the magic happens. The refrigerant absorbs heat from the air passing over the coil. Think of it this way: your outdoor condenser unit releases heat to the outside air. Meanwhile, the evaporator coil inside does the opposite. It pulls warmth out of your indoor air and transfers it to the refrigerant. As warm air from your home blows across the cold evaporator coil, the refrigerant inside absorbs that heat. The now-cooled air then circulates back through your ductwork. This process lowers your home’s temperature. The process also removes humidity from your air. Because the coil surface is cold, moisture in the air condenses on it. This works much like water droplets form on a cold glass of tea on a humid day. That condensation drips into a drain pan and flows away through a condensate line. This is why proper drainage matters so much. How Your Evaporator Coil Works in the Cooling Process Understanding the refrigeration cycle helps you appreciate why the air conditioner evaporator coil is so critical. The cycle starts when liquid refrigerant enters the evaporator coil through an expansion valve. As it enters, the refrigerant expands and its pressure drops dramatically. This causes its temperature to drop significantly. This super-cold refrigerant then flows through the tubing. Meanwhile, your blower motor pushes warm air from your home across the coil’s surface. The refrigerant eagerly absorbs heat from that air. It changes from a cold liquid into a cool gas. Once the refrigerant has absorbed all the heat it can hold, it travels through refrigerant lines to your outdoor condenser unit. Outside, the compressor pressurizes the refrigerant gas and heats it even more. The hot, pressurized gas then flows through the condenser coil. Here, outdoor air absorbs the heat. As the refrigerant cools, it condenses back into a liquid and the cycle repeats. Without a properly functioning air conditioner evaporator coil, this entire cooling process breaks down. Common Evaporator Coil Problems We See After years of servicing air conditioning systems across Tyler, we’ve diagnosed countless evaporator coil issues. Knowing the warning signs helps you catch problems before they cause complete system failure. Early detection also prevents expensive secondary damage. Frozen Evaporator Coil One of the most common issues we encounter is a frozen coil. You might see ice forming on the refrigerant lines. You could also notice your system running constantly without cooling. In these cases, you’re likely dealing with this problem. Several things cause coils to freeze. These include restricted airflow from a dirty air filter, low refrigerant levels, or a broken blower motor. When airflow across the coil decreases, the refrigerant gets too cold. Moisture freezes on the coil surface. That ice layer then blocks even more airflow, making the problem worse. Eventually, you’ll have a solid block of ice that completely prevents cooling. If you notice ice formation, turn off your system immediately and call us. We’ll safely thaw the coil and diagnose the underlying cause. This could be airflow restriction, refrigerant levels, or mechanical failure. Dirty or Clogged Coils Dust, pet hair, and other airborne particles gradually build up on evaporator coils. This happens despite your air filter’s best efforts. Over time, this buildup acts like a blanket. It insulates the coil and prevents efficient heat transfer. Your system has to run longer to cool your home. As a result, energy bills climb and cooling performance drops noticeably. We also see biological growth on coils, especially in our humid climate. Mold and mildew thrive in the dark, damp environment around the coil. Beyond reducing efficiency, this growth can spread musty odors through your home. It can also potentially affect indoor air quality. In severe cases, this can lead to dirty sock syndrome. This condition creates unpleasant odors throughout your home. Refrigerant Leaks The air conditioner evaporator coil develops leaks more often than most people expect. Corrosion from condensation can create tiny holes in the coil tubing. Formaldehyde off-gassing from building materials also causes damage. Simple age can lead to leaks as well. Because the evaporator coil operates under negative pressure during cooling, these leaks allow refrigerant to escape. Low refrigerant levels mean less heat absorption. Your home stays warmer even though the system runs constantly. You might notice ice forming on the refrigerant lines. You could also hear a hissing sound near the indoor unit. Refrigerant leaks require professional repair. We’ll locate the leak and properly seal it using specialized equipment. Then we’ll recharge the system to manufacturer specifications. Coil Corrosion and Age Evaporator coils don’t last forever. After 10-15 years of constant exposure to condensation and temperature swings, even well-maintained coils start deteriorating. The metal fins corrode and tubing develops pinhole leaks. Efficiency drops as well. Sometimes the most cost-effective solution is replacing the coil rather than repeatedly patching leaks. We’ll always give you honest guidance about whether repair or replacement makes more sense. If your system is older and the coil is failing, it might be time to consider replacing the entire air conditioning system. This often makes more sense than investing in a new coil for an aging unit. Signs Your Evaporator Coil

Running a business comes with countless responsibilities, but one that can’t be overlooked is keeping your commercial HVAC system properly maintained. Unlike residential systems, commercial HVAC equipment works harder, runs longer, and serves more people every day. That’s why commercial HVAC maintenance isn’t just recommended—it’s absolutely critical for your business success. At C&R Services, we’ve seen firsthand how preventive maintenance can save businesses thousands of dollars while keeping employees and customers comfortable year-round. When we approach each maintenance call, we’re not just checking boxes—we’re serving people and protecting the investments that business owners have worked so hard to build. What Makes Commercial HVAC Systems Different Commercial HVAC systems are complex beasts compared to residential units. They typically feature larger capacities, multiple zones, and sophisticated controls that manage air quality, temperature, and humidity across vast spaces. These systems often include: Rooftop units handling massive air volumes Chillers and boilers for heating and cooling Complex ductwork serving multiple floors or zones Building management systems with automated controls Industrial-grade air filtration systems Because these systems run continuously during business hours and handle much heavier loads than residential units, they require specialized maintenance approaches. A certified technician familiar with commercial equipment understands the unique demands these systems face and knows how to keep them running efficiently. Signs Your Commercial HVAC System Needs Professional Attention Business owners often ask us how they can tell when their HVAC system needs maintenance. While we always recommend scheduled preventive maintenance, certain warning signs indicate immediate professional attention is needed: Temperature inconsistencies across different areas of your building often signal airflow problems, faulty dampers, or issues with zone controls. If some offices are freezing while others are sweltering, your system isn’t distributing conditioned air properly. Rising energy bills without corresponding increases in usage typically indicate declining system efficiency. When HVAC components get dirty or start wearing out, they work harder to maintain the same comfort levels, driving up operating costs. Unusual noises like grinding, squealing, or rattling sounds often indicate worn bearings, loose belts, or failing motors. These sounds are your system’s way of crying for help before a major breakdown occurs. Poor indoor air quality complaints from employees or customers can indicate problems with filtration systems, ductwork contamination, or inadequate ventilation. This isn’t just a comfort issue—it can affect productivity and health. If you’re experiencing any of these issues, AC running but not cooling problems might be affecting your commercial system as well, requiring immediate professional diagnosis. What Professional Commercial HVAC Maintenance Includes When C&R Services performs commercial maintenance, we follow a comprehensive approach that addresses every critical component. A certified technician will systematically inspect, clean, and adjust your entire system to ensure peak performance. Mechanical component inspection involves checking all moving parts, including motors, fans, belts, and bearings. Your HVAC professional will look for signs of wear, lubricate components as needed, and identify parts that may need replacement before they fail. Electrical system evaluation includes testing all electrical connections, checking control systems, and verifying that safety switches and sensors are functioning properly. Electrical problems in commercial systems can be particularly dangerous and expensive if left unchecked. Refrigeration system analysis involves checking refrigerant levels, testing for leaks, and ensuring that compressors and condensers are operating efficiently. Your technician will also examine heat exchangers and coils for damage or efficiency problems. Air distribution assessment includes inspecting ductwork for leaks, checking damper operation, and verifying that air handlers are delivering proper airflow to all zones. This is particularly important in commercial buildings where air distribution affects multiple spaces. Professional maintenance also includes return air vent function evaluation to ensure proper air circulation throughout your commercial space. The Hidden Costs of Skipping Maintenance Many business owners try to cut costs by deferring HVAC maintenance, but this approach often backfires. The U.S. Department of Energy notes that neglecting air conditioner maintenance leads to declining performance and increased energy use, making regular service important for efficiency and long-term system health. Emergency repairs typically cost 3-5 times more than preventive maintenance. When a critical component fails during peak business hours, you’re not just paying premium emergency rates—you’re also losing revenue from uncomfortable customers and unproductive employees. Premature equipment replacement represents the biggest hidden cost. Commercial HVAC systems that receive regular maintenance can last 20-25 years, while neglected systems often fail after just 10-15 years. The difference in replacement costs can easily reach six figures for large commercial installations. Indoor air quality problems from poor maintenance can lead to employee sick days, reduced productivity, and even liability issues if customers or staff develop health problems related to poor air quality. How Often Should Commercial Systems Be Maintained Commercial HVAC maintenance frequency depends on several factors, including system size, usage patterns, and environmental conditions. Most commercial systems benefit from quarterly maintenance visits, with some high-use equipment requiring monthly attention. Restaurants, medical facilities, and manufacturing operations typically need more frequent maintenance due to contamination from cooking oils, medical processes, or industrial activities. Office buildings and retail spaces usually require less frequent service but still need regular attention. Your HVAC professional will develop a customized maintenance schedule based on your specific needs. This might include seasonal tune-ups before peak heating and cooling seasons, plus regular filter changes and system monitoring throughout the year. Some businesses benefit from maintenance contracts that include regular visits, priority service, and discounted repair rates. These agreements ensure your system receives consistent attention while helping you budget for maintenance costs. Energy Efficiency and Cost Savings One of the biggest benefits of regular commercial HVAC maintenance is improved energy efficiency. Clean filters, properly calibrated controls, and well-lubricated components all contribute to lower operating costs. A certified technician will optimize your system settings for maximum efficiency while maintaining comfort levels. This might involve adjusting temperature setpoints, optimizing fan speeds, or reprogramming control systems to match your actual occupancy patterns. Regular maintenance also helps identify opportunities for system upgrades that can further reduce energy costs. Your technician might recommend programmable thermostats, variable speed drives, or energy