Fixing AC Drainage Problems in Charleston

Living in Charleston during the summer means relying on your air conditioner almost daily. Between the heat and high humidity, it can quickly become uncomfortable indoors if your AC isn’t working right. While most people focus on things like cooling strength and air filters, what often gets overlooked is something much smaller but just as important—your AC’s ability to drain out moisture properly.

When the drainage system fails, it doesn’t always stop your unit from running, but it can cause a lot of trouble behind the scenes. We’ve seen water pooling around equipment, musty smells inside homes, mold in hard-to-reach places, and even damage to ceilings or floors. These are all signs that something’s wrong with the way your system is removing excess water, which can sneak up on you fast. Let’s break down what’s really going on and how to spot the problem early.

Understanding AC Drainage Problems

Every air conditioning system is built to manage moisture. As your AC cools warm air, it draws humidity from inside your home. That moisture turns into condensation, which needs to flow out of the system through a dedicated drain line.

If anything disrupts this process, things can back up. That backup can lead to water damage around your unit or walls, as well as mold and a spike in that damp, musty smell we all try to avoid. In some serious cases we’ve come across, the drain isn’t just clogged—it’s completely blocked for weeks without anyone noticing. By the time the issue is found, drywall and flooring have already started showing water stains.

Here are a few signs that your AC may be having trouble draining moisture properly:

– Water pooling around or beneath the indoor part of the unit

– A strong musty or moldy odor near vents

– Unusual dripping sounds or trickling water inside the unit

– AC shutting down or not turning on due to a triggered safety mechanism

– Increased indoor humidity even while the AC is running

These problems usually don’t disappear on their own. In fact, if left untreated, a small clog or leak can quickly snowball into something much worse. Spotting the symptoms early helps save time and money, and helps your AC last longer.

Common Causes of AC Drainage Issues

When AC drainage problems show up, there’s usually a root cause behind them. Understanding what’s going wrong can help you stay one step ahead. Let’s break down the most common reasons things start to fail.

1. Clogged Drain Line

The drain line carries water outside the home. Over time, dirt, dust, algae, or even insect nests can build up in the line, slowly blocking the flow. When this happens, condensation that should be heading out ends up sitting inside the unit, or worse, dripping down into floors or walls.

2. Improper Installation

If the unit or drain line was installed at the wrong angle, or if the materials weren’t properly secured, water may not drain out at all. Gravity plays a big role in guiding the moisture out, and it only works if the layout was done right. This type of issue isn’t usually visible to the naked eye, which is why installation problems can go unnoticed for a long time.

3. Damaged or Broken Parts

Just like any other part of your AC, the drainage system has components that can wear out. If the drain pan is cracked, or if a float switch fails, water won’t be managed safely. Over time, even corrosion inside the lines can cause leaks or breaks that are hard to detect without a closer look.

These issues can develop slowly, or they can show up without warning—especially during Charleston’s humid summer months when your AC is running most of the day. Knowing where the problem is coming from makes fixing it easier and helps prevent more damage.

Steps to Address and Prevent AC Drainage Problems

Addressing AC drainage issues early can save you a lot of trouble down the line. Here are a few effective steps to take:

– Regular Maintenance

Your AC system needs regular check-ups to make sure everything is working the way it should. Plan to have your unit inspected at least once a year, ideally before the summer heat kicks in. A professional can look at the entire system, clear the drain lines, and catch any problems early.

– Professional Inspection

While it might be tempting to try and fix a small problem yourself, experienced HVAC technicians can solve issues faster and more thoroughly. If your drain system is backing up or something looks off, it’s best to call a trusted emergency HVAC contractor in Charleston who knows how to fix it right the first time. This helps you avoid bigger messes that might be hiding behind walls or ceiling panels.

– DIY Prevention Tips

You don’t have to be a pro to help your system stay in good shape between visits. These simple steps can reduce the risk of clogs:

– Take a quick look at the drain line every couple of months to check for buildup

– Pour a small amount of vinegar into the drain tube to flush out gunk

– Use a wet/dry vacuum to pull water out of the pipe if you notice slow drainage

Keeping an eye on drainage keeps your unit from working extra hard and saves you money in the long run.

Avoid Future AC Drainage Issues with Professional Help

Working with HVAC professionals in Charleston gives you peace of mind. They understand how the hot, damp climate affects your system and know what to look for before it becomes a problem.

One of the biggest advantages of hiring a skilled HVAC contractor is how they spot early warning signs. What might look like a simple stain around the AC can mean bigger trouble in the drain pan or lines. Professionals can stop the damage before your drywall or flooring takes a hit.

They’ll make sure the drain line is positioned right, the float switch works, and the pan is clear. These things don’t take long to check, but they make a big difference—especially when your AC is working hard through Charleston’s hot stretch of the year.

Keeping Charleston Homes Cool and Comfortable

When your AC’s drainage system is working the way it should, your whole home benefits. The air feels drier, there’s no odd mildew smell, and you won’t have to worry about surprise water stains.

Fixing a small drainage problem now avoids bigger, costlier ones later. Getting help from a trusted emergency HVAC contractor in Charleston means your air conditioner will be ready to beat the heat all season long.

Staying on top of this part of your AC system keeps your home more comfortable and your repair bills lower. A well-maintained unit doesn’t just cool better—it lasts longer and gives you fewer headaches.

Whether you’ve had recent drainage problems or just want to prevent them, professional AC care is a smart move for families in Charleston.

Make sure your AC is always running smoothly, especially during Charleston’s hot and humid summers. When unexpected issues come up, count on an experienced emergency HVAC contractor to respond quickly and get things back to normal. Coastal Carolina Comfort is committed to keeping your home cool and worry-free all season long.

Share This Post

Get 10% Off Your First Service and a FREE Quote

More To Explore

HVAC

The Summerville HVAC Maintenance Checklist

The Summerville HVAC Maintenance Checklist That Prevents 90% of Repairs Regular HVAC maintenance prevents up to 90% of common repairs and extends system lifespan by 5-7 years. Summerville homeowners should perform monthly tasks (filter checks, vent clearing, thermostat monitoring), seasonal tasks (condensate drain treatment, outdoor unit cleaning, refrigerant line inspection), and schedule professional tune-ups twice yearly—in spring before cooling season and fall before heating season. The Lowcountry’s extreme humidity, extended cooling season, and airborne particulates demand more frequent maintenance than national guidelines suggest. A well-maintained system runs more efficiently, breaks down less often, and keeps your home comfortable year-round. Introduction: The Cheapest Repair Is the One You Never Need Here’s a number that should get your attention: 90%. That’s the percentage of HVAC repairs that could have been prevented with proper maintenance. Nine out of ten service calls we make in Summerville are for problems that didn’t have to happen. Clogged filters that caused compressors to overheat. Condensate drains that backed up and flooded ceilings. Capacitors that failed because coils were too dirty to dissipate heat. Refrigerant leaks that started as minor corrosion nobody caught. Every one of these repairs cost the homeowner hundreds—sometimes thousands—of dollars. And every one of them was preventable. At Coastal Carolina Comfort, we’ve maintained HVAC systems across the Lowcountry for over a decade. We’ve seen what neglect does to equipment in our climate. We’ve also seen homeowners who follow a simple maintenance routine go 10+ years without a single major repair. This guide gives you that routine. It’s specifically designed for Summerville’s climate—not generic advice written for somewhere with mild summers and low humidity. Follow this checklist, and you’ll dramatically reduce your repair bills, extend your system’s life, and stay comfortable no matter what the Lowcountry weather throws at you. Why Summerville Systems Need More Maintenance Before we dive into the checklist, let’s talk about why maintenance matters more here than almost anywhere else. The Extended Cooling Season In Minneapolis, an AC might run 4 months per year. In Summerville, we’re cooling 8-9 months—sometimes longer. That’s twice the operating hours, twice the wear, and twice the opportunity for problems to develop. A system that runs from April through November accumulates wear equivalent to nearly two years of operation in a milder climate. Maintenance intervals need to reflect that reality. The Humidity Factor Summerville’s average humidity hovers around 70-80% year-round. During summer mornings, it regularly exceeds 90%. This humidity: Forces your system to work harder (dehumidification uses significant energy) Creates ideal conditions for biological growth in drain lines and on coils Accelerates corrosion on electrical components and refrigerant lines Causes condensate drain clogs—one of the most common service calls we see Related: Learn how Summerville’s humidity damages HVAC systems Airborne Particulates Between pollen season (which feels like it lasts 8 months here), coastal salt air, and general Lowcountry dust, your system filters more particulates than systems in cleaner environments. Filters clog faster, coils get dirtier, and airflow restrictions develop more quickly. The Bottom Line National maintenance guidelines assume average conditions. Summerville doesn’t have average conditions—we have extreme conditions. Your maintenance routine needs to account for that. Monthly Maintenance Tasks These quick tasks take 10-15 minutes and should become habit. Do them on the same day each month—the first Saturday, the day you pay your mortgage, whatever helps you remember. 1. Check and Replace Your Air Filter This is the single most important thing you can do for your HVAC system. A clogged filter: Restricts airflow, forcing your system to work harder Causes evaporator coils to freeze Leads to compressor overheating and failure Increases energy consumption by 5-15% Reduces indoor air quality How to check: Locate your filter (return air grille, air handler, or dedicated filter slot) Remove the filter and hold it up to light If you can’t see light through it clearly, replace it If it’s visibly gray or caked with debris, replace it immediately Summerville-specific guidance: During peak cooling season (May-September), check weekly and replace every 30-45 days During shoulder seasons, check monthly and replace every 45-60 days During pollen season (spring), you may need to replace every 2-3 weeks After storms or high-wind events, check immediately Filter recommendations: Use pleated filters rated MERV 8-11 for best balance of filtration and airflow Avoid fiberglass filters (minimal filtration) and ultra-high MERV ratings (can restrict airflow) Buy filters in bulk—you’ll use 8-12 per year in Summerville 2. Clear Supply and Return Vents Blocked vents disrupt airflow balance and force your system to work harder. Monthly walkthrough: Check all supply vents (where air blows out) for obstructions Check all return vents (where air is pulled in) for blockages Move furniture, curtains, rugs, or stored items that block airflow Vacuum vent covers to remove dust buildup Ensure all vents are open (closing vents doesn’t save energy—it creates pressure imbalances) 3. Monitor Thermostat Performance Your thermostat is the brain of your HVAC system. Small issues here cause big problems. Monthly checks: Verify the display is clear and responsive Confirm the temperature reading seems accurate (compare to a separate thermometer) Check that the system responds when you adjust settings Replace batteries annually (or when the low battery indicator appears) For smart thermostats, ensure WiFi connection is stable Warning signs: Temperature swings greater than 2-3 degrees from setpoint System not responding to setting changes Blank or flickering display “Auxiliary heat” running frequently (for heat pump systems) 4. Listen and Observe Your system tells you when something’s wrong—if you’re paying attention. Monthly awareness check: Listen for unusual noises (grinding, squealing, banging, clicking) Notice any unusual odors from vents Feel for weak airflow or temperature inconsistencies Watch for water around the indoor unit Check for ice on refrigerant lines (visible at the outdoor unit) Related: Know the 5 warning signs your AC is about to break down Seasonal Maintenance Tasks These tasks should be performed quarterly or at the start of each season. They’re more involved than monthly tasks but still manageable for most homeowners. Spring: Prepare for Cooling Season Complete these tasks in

Derrick Hall January 28, 2026

Air Conditioning

HVAC Repair vs. Replacement

HVAC Repair vs. Replacement: A Summerville Homeowner’s Decision Guide Deciding between HVAC repair and replacement comes down to four key factors: the cost of repair relative to replacement (use the 50% rule—if repairs exceed half the cost of a new system, replace), the age of your equipment (systems over 15 years old are usually better replaced), refrigerant type (R-22 systems should be replaced due to phase-out costs), and repair frequency (multiple repairs per year signal it’s time). Summerville homeowners should also factor in energy efficiency gains, available rebates, and the demanding Lowcountry climate that shortens system lifespans compared to national averages. The Question Every Homeowner Dreads Your HVAC technician just delivered the news: your system needs a major repair. Maybe it’s a compressor. Maybe it’s a coil leak. Whatever it is, the number has four digits, and now you’re facing the question every Summerville homeowner eventually confronts. Do I fix it, or do I replace the whole thing? It’s not an easy decision. Repair feels like the cheaper option—until you’re repairing again six months later. Replacement feels like the responsible choice—until you see the price tag. And everyone from your neighbor to your brother-in-law has an opinion. At Coastal Carolina Comfort, we’ve guided thousands of Lowcountry homeowners through this exact decision. We’ve seen people waste money repairing systems that should have been replaced years ago. We’ve also seen people replace perfectly good equipment because someone talked them into it. This guide will give you the framework to make the right decision for your situation—not based on sales pressure, but on facts, math, and what actually makes sense for your home and budget. The 50% Rule: Your Starting Point The most reliable rule of thumb in the HVAC industry is simple: If the repair costs more than 50% of what a new system would cost, replace instead of repair. Here’s why this works: The Math Behind the Rule Let’s say a new HVAC system for your Summerville home costs $8,000 installed. Using the 50% rule: Repair cost under $4,000: Repair is likely the better value Repair cost over $4,000: Replacement makes more financial sense But this isn’t just about today’s repair. It’s about what comes next. A system that needs a $3,500 repair today is likely to need another significant repair within 1-2 years. That’s the nature of aging equipment—when major components fail, others are usually close behind. So that $3,500 repair might actually cost you $3,500 + $1,200 + $800 over the next two years. Suddenly you’ve spent $5,500 and still have an old, inefficient system. When to Adjust the Rule The 50% rule is a starting point, not an absolute. Adjust based on: System age: For systems under 8 years old, you might stretch to 60-70% before replacing—they likely have more good years ahead. For systems over 12 years old, consider replacing at 30-40% of replacement cost. Repair history: If this is the first major repair on a well-maintained system, lean toward repair. If it’s the third repair this year, lean toward replacement regardless of cost. Component involved: Some repairs (capacitor, contactor, fan motor) are normal wear items that don’t indicate broader system failure. Others (compressor, evaporator coil) often signal the beginning of the end. The Age Factor: How Old Is Too Old? System age is the second most important factor in your decision. Average HVAC Lifespan National average: 15-20 years with proper maintenance Summerville reality: 12-16 years is more typical Why the difference? Our systems work harder. A Summerville AC runs 8-9 months per year, often 12+ hours per day during summer. Compare that to a system in Minneapolis that might run 4 months per year. More operating hours means faster wear. Age-Based Decision Framework Under 8 years old: Almost always repair unless the cost exceeds 50% of replacement. These systems have significant life remaining. 8-12 years old: Evaluate carefully. Major repairs may be worthwhile, but start planning for eventual replacement. This is a good time to begin saving. 12-15 years old: Lean toward replacement for major repairs. The system is in its final years, and repair money is often better invested in new equipment. Over 15 years old: Replace for any significant repair. Even if the repair is relatively affordable, you’re likely facing additional failures soon. The efficiency gains alone often justify replacement. The Warranty Consideration Most HVAC systems come with: 5-10 year compressor warranty 5-10 year parts warranty 1 year labor warranty (sometimes extended by the installer) If your system is still under warranty, repair almost always makes sense—your out-of-pocket cost is limited to labor and any non-covered parts. Check your paperwork or call your installer to verify warranty status before making any decisions. The R-22 Refrigerant Problem If your system uses R-22 refrigerant (also called Freon or HCFC-22), this single factor may make your decision for you. What Happened to R-22 R-22 was the standard air conditioning refrigerant for decades. However, due to its ozone-depleting properties, the EPA phased it out: 2010: No new R-22 systems could be manufactured 2020: Production and import of R-22 banned entirely This means all R-22 available today is either recycled or reclaimed from decommissioned systems. Supply is limited and shrinking every year. The Cost Impact R-22 prices have skyrocketed: 2010: Approximately $10-15 per pound 2020: Approximately $50-75 per pound 2026: $100-200+ per pound depending on availability A typical residential AC system holds 6-12 pounds of refrigerant. If your R-22 system develops a leak, you’re looking at: Leak repair: $200-$1,000+ depending on location Refrigerant recharge: $600-$2,400+ for a full charge Total cost: Often $1,000-$3,000+ for a single repair And here’s the kicker—if it leaks once, it will likely leak again. You could face these costs repeatedly. How to Know If You Have R-22 Check the data plate on your outdoor unit. Look for: “R-22” or “HCFC-22” = R-22 system (consider replacement) “R-410A” or “Puron” = Modern refrigerant (repair may make sense) If your system was installed before 2010, it almost certainly uses R-22. Systems installed 2010-2015 could be either. Systems installed after 2015 are virtually all R-410A. Our Recommendation If you have an R-22 system that needs any refrigerant-related repair, replace

Derrick Hall January 28, 2026

Understanding AC Drainage Problems