AC Frozen Evaporator Coil: Why Your Air Conditioner Ices Up in Humid SC Weather
AC Frozen Evaporator Coil: Why Your Air Conditioner Ices Up in Humid SC Weather A frozen evaporator coil occurs when the coil’s surface temperature drops below 32°F and moisture from your indoor air freezes on contact, building a layer of ice that blocks airflow and prevents heat absorption. The most common causes are restricted airflow from a clogged filter or dirty coil, low refrigerant charge from a leak, and blower motor failure that reduces air volume across the coil. In South Carolina’s high-humidity environment, frozen coils are both more common and more damaging than in drier climates — the heavy moisture content in Lowcountry and Midlands air means ice builds faster and produces more water when it melts. Coastal Carolina Comfort diagnoses and repairs frozen evaporator coils across Summerville, Charleston, Columbia, and all of South Carolina. Our NATE-certified technicians identify the root cause — not just thaw the ice — and provide upfront pricing before any repair begins. Call (843) 708-8735. How a Frozen Coil Damages Your AC System A frozen evaporator coil isn’t just a temporary inconvenience — it creates a cascade of problems that can damage multiple components if the system continues running. The compressor is at greatest risk. Under normal operation, liquid refrigerant enters the evaporator coil, absorbs heat, and exits as a gas before returning to the compressor. When the coil freezes, this heat exchange stops. Liquid refrigerant passes through the coil without vaporizing and reaches the compressor in liquid form. Compressors are designed to pump gas, not liquid. Liquid refrigerant entering the compressor — called liquid slugging — can crack valves, damage pistons, and cause catastrophic compressor failure. A compressor replacement typically costs $1,500–$3,000+. Water damage when the ice melts. A frozen coil accumulates a surprising amount of ice. When the system shuts off or the ice begins to melt, the resulting water can easily overwhelm the drain pan — especially if the drain line is also partially clogged (a common combination in South Carolina). Water overflows onto floors, into ceilings, or through walls. Read our guide on AC leaking water inside your house for immediate steps if you’re already dealing with water. Reduced system life. Repeated freeze-thaw cycles stress the coil fins, degrade the coil’s protective coating, and can eventually cause refrigerant leaks in the coil itself — one of the most expensive AC repairs. The 5 Causes of Frozen Evaporator Coils in South Carolina 1. Clogged Air Filter This is the most common cause — and the most preventable. A clogged filter restricts the volume of warm air passing over the evaporator coil. Without sufficient warm air, the coil’s temperature drops below the freezing point. Moisture in the air freezes on contact, and the ice layer further restricts airflow, accelerating the freeze. In South Carolina, where pet dander, pollen, dust, and high humidity all contribute to faster filter loading, a filter that might last 90 days in a drier climate may need replacement every 30 days during peak cooling season. The fix: Replace the filter, turn the system off for 2–3 hours to allow complete thawing, then restart. If the system runs normally and doesn’t refreeze, the filter was the sole cause. If ice returns within 24 hours, there’s an additional underlying issue. 2. Low Refrigerant From a Leak Low refrigerant charge causes the evaporator coil’s temperature to drop below normal operating range. When the coil is too cold, moisture freezes on its surface instead of condensing into liquid and draining away. The ice insulates the coil, making it even colder, and the freeze accelerates until the coil is completely encased. This is the most common mechanical cause of frozen coils, and it requires professional repair. A technician will thaw the coil, test for leaks, repair the leak source, and recharge the system to manufacturer specifications. Simply adding refrigerant without fixing the leak guarantees the problem will return. In South Carolina’s coastal environment, refrigerant line corrosion from salt air is a significant contributor to leaks — particularly on homes within a few miles of Charleston Harbor, James Island, or the Isle of Palms. 3. Dirty Evaporator Coil Even with regular filter changes, the evaporator coil accumulates dust, biological growth, and particulate matter over time — especially in South Carolina’s humid environment where mold and mildew thrive on the constantly damp coil surface. A dirty coil insulates itself from the warm air passing over it. The coil can’t absorb enough heat, its temperature drops, and the same freeze cycle begins. The difference is that a dirty-coil freeze develops more gradually than a low-refrigerant freeze — you might notice declining performance for weeks before ice becomes visible. The fix: Professional coil cleaning. This requires access to the indoor unit, coil-specific cleaning solution, and careful handling to avoid damaging the delicate aluminum fins. Coil cleaning is typically included in comprehensive maintenance visits that prevent frozen coils and costs $150–$300 as a standalone service. 4. Blower Motor Failure or Reduction The blower motor moves air across the evaporator coil. If it fails entirely, airflow stops completely and the coil freezes rapidly. A partially failing motor — running at reduced speed due to worn bearings, a failing capacitor, or a winding issue — moves insufficient air, causing a slower but equally damaging freeze. In multi-speed systems, a motor stuck on low speed may provide enough airflow for mild days but insufficient volume on high-demand days, creating intermittent freezing that’s harder to diagnose. 5. Collapsed or Blocked Return Ductwork If the return duct — the large duct that carries warm room air back to the air handler — is crushed, disconnected, or severely blocked, the volume of air reaching the evaporator coil drops below the minimum threshold. This can happen when stored items are placed on flex duct in an attic, when a duct joint separates due to age or poor installation, or when a return vent is blocked by furniture or closed. This cause is more common in homes with ductwork routed through attics — a standard
AC Unit Making Strange Noises: What Each Sound Means and When to Call for Repair
AC Unit Making Strange Noises: What Each Sound Means and When to Call for Repair A healthy air conditioning system produces a consistent, low-level hum during operation. When you hear new sounds — grinding, buzzing, clicking, banging, hissing, or screeching — each noise points to a specific mechanical or electrical problem. Identifying what the sound is and where it’s coming from helps determine whether you need immediate service, can schedule a repair within a few days, or simply have a minor issue that’s easy to resolve. Coastal Carolina Comfort’s NATE-certified technicians diagnose and repair noisy AC systems across Summerville, Charleston, Columbia, and the entire South Carolina Lowcountry and Midlands. We identify the source of the sound, explain what’s causing it, and provide upfront pricing before any work begins. Call (843) 708-8735. A Sound-by-Sound Diagnostic Guide Grinding: Failing Motor Bearings What it sounds like: A metallic grinding, scraping, or growling that gets louder over time. It may be intermittent at first and become constant. Where it comes from: Usually the indoor blower motor or the outdoor condenser fan motor. What’s happening: The motor bearings that allow the shaft to spin freely are wearing out. As the bearings degrade, metal contacts metal, creating the grinding sound. Eventually the motor seizes completely — which turns a $350–$700 motor replacement into a potential compressor failure if the system overheats. Urgency level: Schedule within 1–3 days. A grinding motor can fail at any time. Continuing to run the system accelerates the damage but won’t cause an immediate safety hazard. The longer you wait, the higher the chance the motor seizes during a peak-heat day when you need it most. South Carolina note: The extended cooling season in the Lowcountry and Midlands puts more annual hours on motor bearings than most of the country. A motor that might last 15 years in a cooler climate may wear out in 10–12 years here because it runs 6+ months per year. Buzzing: Electrical Problems What it sounds like: A steady electrical buzz or hum, louder than the system’s normal operating sound. May come from the outdoor unit, indoor unit, or both. What’s happening: Buzzing from the outdoor unit most commonly indicates a failing contactor (the electrical relay that starts the compressor) or loose wiring connections vibrating during operation. Buzzing from the indoor unit may point to a failing transformer, a relay issue, or a blower motor with electrical problems. Urgency level: Schedule within 1–2 days. Electrical issues can worsen without warning. A contactor that’s arcing or buzzing can weld itself shut (causing the system to run nonstop), fail open (causing a complete shutdown), or create a fire risk if left unaddressed. If the buzzing is accompanied by a burning smell, turn the system off at the breaker and call for emergency AC repair in the Lowcountry. Clicking: Capacitor or Control Board Issues What it sounds like: Repeated clicking sounds at startup — the system tries to start, clicks, pauses, tries again, clicks. Or a single click followed by silence instead of the compressor engaging. What’s happening: This is typically a failed run capacitor trying and failing to deliver the electrical boost the compressor needs to start. The click is the contactor engaging, but without sufficient capacitance, the compressor can’t turn over. The system tries repeatedly, clicking each time. Less commonly, clicking indicates a control board relay failure — the electronic brain of the system is sending the start signal but a relay on the board isn’t completing the circuit. Urgency level: Same-day to next-day. The system won’t cool in this state. If the weather is mild, next-day service is fine. In South Carolina summer heat, this is a same-day call. A failed capacitor is one of the quickest and most affordable repairs — typically $150–$300 including parts and labor. Banging or Clanking: Loose or Broken Internal Components What it sounds like: A rhythmic banging, clanking, or knocking — usually from the outdoor unit. The sound follows the fan’s rotation cycle. What’s happening: Something inside the unit is loose and making contact with a moving part. The most common causes are a broken fan blade striking the housing, a loose compressor mounting bolt allowing the compressor to vibrate excessively, or debris (a stick, acorn, or small animal) caught inside the condenser housing. Urgency level: Turn off and schedule same-day. A broken fan blade or loose component can cause escalating damage to other parts with every rotation. Turn the system off at the thermostat and call for service. Do not reach inside the unit to investigate. Hissing or Bubbling: Refrigerant Leak What it sounds like: A persistent hiss from the indoor or outdoor unit, or a bubbling/gurgling sound from the refrigerant lines. What’s happening: Refrigerant is escaping through a hole or crack in the copper lines, coil, or fittings. A hiss indicates gas-phase refrigerant escaping under pressure. A bubbling sound indicates the leak is in a section where refrigerant is in liquid phase. Urgency level: Schedule within 1–2 days. A refrigerant leak won’t cause immediate damage to your home, but every day it leaks reduces cooling capacity and forces the compressor to work harder. Running a system with critically low refrigerant can cause compressor damage. If you also notice ice forming on the indoor unit, turn the system off. In South Carolina’s coastal and humid environment, refrigerant line corrosion is more common than in drier climates — particularly on homes near the coast where salt air accelerates copper degradation. Our guide on what South Carolina humidity does to your cooling system explains why. Screeching or Squealing: Belt or Motor Issues What it sounds like: A high-pitched screech or squeal, usually at startup, that may fade as the system reaches operating speed. What’s happening: In older systems with belt-driven blower motors, a worn or misaligned belt slips and squeals — similar to a car’s serpentine belt. In newer direct-drive systems, the screech may indicate a failing motor bearing or a blower wheel rubbing against its housing. Urgency level: Schedule within
AC Blowing Warm Air? What South Carolina Homeowners Should Check First
AC Blowing Warm Air? What South Carolina Homeowners Should Check First An AC system blowing warm air is most commonly caused by low refrigerant from a leak, a failed or failing compressor, a thermostat set incorrectly, or a frozen evaporator coil that has thawed and re-frozen in a cycle that prevents proper cooling. In South Carolina’s climate — where indoor temperatures can climb past 85°F within hours of losing cooling — identifying the cause quickly matters both for comfort and for preventing secondary damage to your system. Coastal Carolina Comfort’s NATE-certified technicians diagnose the root cause of warm air from AC vents across Summerville, Charleston, Columbia, and the entire South Carolina Lowcountry and Midlands. Most warm-air issues can be diagnosed and repaired in a single same-day visit. Call (843) 708-8735 to schedule your diagnostic. Quick Checks Before You Call a Technician Before scheduling a service call, run through these homeowner-safe checks. They take less than five minutes and resolve the problem roughly 15% of the time. Check your thermostat settings. It sounds basic, but it’s the first thing our technicians verify on every call. Make sure the thermostat is set to “cool” (not “heat” or “fan only”) and that the set temperature is at least 3–5°F below the current room temperature. If someone in the household accidentally bumped the setting — or if a smart thermostat entered a scheduling mode — the system may be functioning exactly as programmed, just not as you expected. Check the air filter. A severely clogged air filter restricts airflow across the evaporator coil. When airflow drops below the minimum threshold, the coil temperature plummets, moisture on the coil freezes, and ice builds up until the coil can no longer absorb heat from your indoor air. The result: your system runs, but the air coming from the vents is room temperature or warmer. Pull the filter out. If you can’t see light through it, replace it and give the system 2–3 hours to thaw before restarting. Check the outdoor unit. Walk outside and look at the condenser unit. Is the fan spinning? If the outdoor unit is completely silent or humming but the fan isn’t moving, the system can’t release heat — which means it can’t cool your home. A non-spinning fan usually points to a failed capacitor or burned-out fan motor. Do not attempt to manually spin the fan blade — call for professional repair. Check the circuit breakers. Your AC system typically runs on two breakers — one for the indoor air handler and one for the outdoor condenser. If the outdoor breaker has tripped but the indoor breaker hasn’t, the air handler will continue to blow air through your vents, but without the outdoor unit running, that air won’t be cooled. Reset the breaker once. If it trips again immediately, stop — that indicates an electrical fault that requires professional diagnosis. If none of these checks resolve the issue, the problem is internal to the system and requires a trained technician. The 6 Most Common Causes of an AC Blowing Warm Air 1. Low Refrigerant From a Leak This is the most frequent cause of warm air from AC vents in South Carolina. Your air conditioning system doesn’t consume refrigerant — it circulates the same charge in a sealed loop. If the charge is low, there’s a leak somewhere in the system. Low refrigerant reduces the evaporator coil’s ability to absorb heat from your indoor air. As the charge drops, the temperature differential between supply air and return air narrows until the air coming from your vents feels lukewarm or warm. In South Carolina’s high-humidity environment, low refrigerant also causes the evaporator coil to operate below the dew point in unpredictable ways, leading to inconsistent cooling and excessive condensation or ice formation. Coastal Carolina Comfort performs a leak check, locates the source, repairs it, and recharges the system to manufacturer specifications. Simply adding refrigerant without finding the leak is a temporary fix that will fail again — often within weeks in the Lowcountry’s demanding climate. Learn more about what South Carolina’s climate does to your cooling system. 2. Compressor Failure The compressor is the component that pressurizes refrigerant and drives the entire cooling cycle. When it fails — partially or completely — the system loses its ability to transfer heat from inside your home to the outside. Your air handler will still blow air through the vents, but that air won’t be cooled. Compressor failures in South Carolina are often caused by extended run times during sustained summer heat, chronic low refrigerant that forces the compressor to work harder, electrical issues from power surges, or simple age-related wear. The outdoor unit may hum without starting, make a clicking sound as it tries repeatedly to engage, or trip the circuit breaker. Compressor replacement is one of the most expensive AC repairs — typically $1,500–$3,000+ depending on the system. For systems over 10 years old, this repair often triggers a conversation about whether to repair or replace your AC system. 3. Frozen Evaporator Coil A frozen evaporator coil can’t absorb heat. When ice builds up on the coil, airflow drops further, the ice gets worse, and your system enters a downward spiral where it runs constantly but cools poorly or not at all. The most common causes are restricted airflow (clogged filter, closed vents, dirty coil) and low refrigerant. In South Carolina’s humid climate, frozen coils are particularly problematic because the ice melts and refreezes in cycles that can flood your condensate pan and overflow onto floors. Read our full guide on frozen evaporator coils in humid South Carolina weather. 4. Thermostat Malfunction A thermostat that reads the wrong temperature, loses its connection to the system, or has a dead battery in a wireless sensor can cause the AC to behave erratically — including blowing air without activating the cooling cycle. Modern smart thermostats with multiple sensors, scheduling features, and Wi-Fi connectivity have more potential failure points than older mechanical models. If your
How Much Does AC Repair Cost in South Carolina?
How Much Does AC Repair Cost in South Carolina? The average cost of AC repair in South Carolina ranges from $150 to $650 for common fixes like capacitor replacements, refrigerant recharges, and contactor swaps. Major component repairs — including compressor replacement, evaporator coil replacement, and condenser fan motor swaps — typically cost between $1,000 and $3,500 or more, depending on the system type, the part required, and labor. Coastal Carolina Comfort provides transparent, upfront pricing on every AC repair we perform across Summerville, Charleston, and the Lowcountry, so you know exactly what you’re paying before we start any work. We believe honest pricing builds trust, and trust is the foundation of every relationship we have with our neighbors. Understanding what drives AC repair costs helps you make informed decisions, avoid overpaying, and know when repair makes sense versus when it’s time to consider replacement. AC Repair Cost Breakdown by Repair Type Every AC repair is different, but the pricing below reflects what South Carolina homeowners can typically expect in 2026 for the most common repairs. These ranges account for the diagnostic fee, parts, and labor. Minor Repairs ($150–$400) Capacitor replacement: $150–$300. The run capacitor is one of the most frequently replaced components in residential AC systems. It stores the electrical charge needed to start and run the compressor and fan motors. Capacitors are relatively inexpensive parts, and a skilled technician can replace one in under an hour. Contactor replacement: $150–$350. The contactor is an electrical switch that controls power flow to the compressor and condenser fan motor. Like capacitors, contactors wear out from the constant on-off cycling that South Carolina’s long cooling season demands. Condensate drain clearing: $100–$250. When the condensate drain line clogs — extremely common in the Lowcountry’s humid climate — water backs up and can trigger a system shutdown via the float switch. Clearing the line is a straightforward service call. Thermostat replacement or recalibration: $150–$400. Depending on whether you’re replacing a basic thermostat or upgrading to a programmable or smart thermostat, costs vary. The diagnosis and wiring work contribute more to cost than the thermostat itself in most cases. Moderate Repairs ($400–$1,000) Refrigerant recharge (with leak detection): $250–$800. The cost depends on the type and amount of refrigerant needed. Systems using R-410A are less expensive to recharge than older systems that originally used R-22, which has been phased out under EPA regulations and is now extremely expensive when available. The leak detection component adds cost but is essential — simply adding refrigerant without finding the leak means the charge will drop again. Blower motor replacement: $400–$900. The blower motor circulates conditioned air through your ductwork. When it fails, you’ll notice weak or absent airflow from your vents. Variable-speed blower motors cost more than single-speed models. Condensate pump replacement: $250–$500. Some installations require a condensate pump to move water from the drain pan to an exterior drain. When the pump fails, water accumulates and can cause damage. Major Repairs ($1,000–$3,500+) Compressor replacement: $1,500–$3,500. The compressor is the most expensive component in your AC system. Replacing a compressor involves recovering the existing refrigerant, removing the old compressor, installing the new one, pulling a vacuum on the system, and recharging with the correct amount of refrigerant. Labor is intensive, and the part itself is expensive. When a compressor fails on an older system, this is often the point where AC repair versus replacement becomes the central question. Evaporator coil replacement: $1,000–$2,500. The evaporator coil sits inside the indoor air handler and absorbs heat from your indoor air. Coil replacements require significant labor because accessing the coil often means partially dismantling the air handler. Leaking evaporator coils are a common source of refrigerant loss. Condenser coil replacement: $1,000–$2,800. The condenser coil sits in the outdoor unit and releases the heat your system absorbs from indoors. In coastal South Carolina, condenser coils are particularly susceptible to salt air corrosion, which accelerates degradation — especially for homes in Charleston, James Island, Sullivan’s Island, and other properties close to the coast. What Factors Affect Your AC Repair Cost? The ranges above are guidelines, not guarantees. Several factors influence where your specific repair falls within those ranges. System Type and Size Central air conditioners, heat pumps, ductless mini-splits, and package units have different component configurations and varying parts costs. A 2-ton system serving a smaller home typically costs less to repair than a 5-ton system serving a larger property, simply because the components are sized differently and the larger parts cost more. Refrigerant Type This is a significant cost factor that many homeowners don’t anticipate. If your system was manufactured before 2010, it likely uses R-22 refrigerant (commonly called Freon). R-22 was phased out under the EPA’s Clean Air Act, and production ceased in 2020. The remaining supply is limited and expensive — an R-22 recharge can cost several hundred dollars more than an equivalent R-410A recharge. If your system requires R-22 and has a significant leak, this is often a strong financial argument for system replacement rather than repair. Part Availability Standard components for common residential systems from manufacturers like Daikin, Goodman, Trane, Carrier, Lennox, and Rheem are generally readily available. Specialty parts, discontinued components, or parts for older systems may require ordering and add wait time and potentially cost. Diagnostic Complexity Some issues are immediately apparent — a visibly damaged capacitor, an obviously clogged drain line. Others require more involved testing — checking refrigerant pressures, performing a leak search, testing electrical components with specialized meters, or evaluating ductwork. The complexity of the diagnostic process affects labor time. Warranty Coverage If your system is still under the manufacturer’s parts warranty (typically 5 to 10 years depending on the manufacturer and whether the system was registered), the parts cost may be covered, and you’d only be responsible for labor. Always check your warranty status before authorizing a major repair. Our team can help you determine warranty coverage during the diagnostic visit. Time of Year and Demand Emergency repairs during peak summer demand (June