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Why is my AC Leaking Water

Why Is My AC Leaking Water? Causes & Solutions for Palo Alto Homes If you’ve noticed water pooling around your air conditioner, it can be alarming. While a small amount of condensation is normal, a steady leak or puddles of water mean something’s wrong. Left untreated, a leaking AC can lead to water damage, mold growth, and costly repairs.
At HVAC Palo Alto, we often hear from homeowners asking: “Why is my AC leaking water?” In this article, we’ll cover the most common causes, what you can do to fix the problem, and when to call a professional HVAC technician.

Is It Normal for an AC to Leak Water?Your air conditioner works by cooling and dehumidifying the air. As warm air passes over the evaporator coil, moisture condenses and drips into a drain pan, then flows out through the condensate drain line.
💧 A little condensation is normal.
🚫 Pooling water around the unit is not normal.

Common Reasons Your AC Is Leaking Water1. Clogged Condensate Drain LineThe most common cause of AC water leaks is a clogged drain line. Dirt, dust, and algae can block the pipe, preventing water from draining properly. Instead, the water backs up and spills out.
Solution: You can sometimes clear small clogs with a wet/dry vacuum or a vinegar-water flush, but stubborn blockages require professional cleaning.

2. Dirty Air FilterWhen your air filter is clogged, airflow is restricted. This can cause the evaporator coil to freeze. Once the ice melts, it can overflow the drain pan and leak water.
Solution: Replace your filter every 1–3 months for smooth airflow and to prevent leaks.

3. Damaged or Rusted Drain PanThe drain pan under your evaporator coil collects condensation. Over time, pans can crack or rust, causing water to spill out.
Solution: A technician may repair small cracks with sealant, but in most cases, replacing the drain pan is the best option.

4. Low Refrigerant LevelsWhen refrigerant is low, pressure in the system drops, causing the evaporator coil to freeze. Just like with dirty filters, when the ice melts, excess water can leak around your unit.
Solution: Low refrigerant usually means you have a leak that needs professional repair.

5. Improper AC InstallationIf your AC was not installed correctly, it may not be level. A tilted system prevents proper drainage, leading to water leaks inside or outside your home.
Solution: A technician can re-level the unit and check that the drain system is set up correctly.

6. High Humidity in Palo AltoDuring humid California summers, your AC works overtime to remove moisture. Excess condensation can overwhelm the drain system and cause leaks.
Solution: Adding a whole-home dehumidifier or scheduling regular maintenance can prevent this issue.

Why You Shouldn’t Ignore an AC Leak

• Mold & Mildew: Moisture promotes mold growth that can affect indoor air quality.
• Water Damage: Leaks can damage ceilings, walls, and flooring.
• Higher Bills: An AC struggling with leaks runs inefficiently, raising energy costs.
• Costly Repairs: Small leaks can turn into big repair bills if ignored.

What You Can Do Before Calling a Technician

• ✅ Replace your air filter.
• ✅ Check your thermostat is set to “Auto” (not “On”).
• ✅ Make sure your unit is level.
• ✅ Inspect the drain line for visible clogs.

If the leak persists, it’s time to call a professional.

Professional Solutions for AC LeaksAt HVAC Palo Alto, our certified technicians can:

• Clean and unclog condensate drain lines
• Replace damaged drain pans
• Check refrigerant levels and repair leaks
• Inspect coils, filters, and ductwork
• Ensure your AC system is properly leveled

Preventing Future AC LeaksThe best way to avoid water leaks is with Regular HVAC Maintenance. A seasonal tune-up keeps your AC clean, efficient, and leak-free.
Our AC maintenance checklist includes:

• Drain Line Flushing Service
• Coil Cleaning Service
• Filter Replacement Service
• Refrigerant checks
• Full system inspection

Call HVAC Palo Alto TodayIf your AC is leaking water, don’t wait until the problem causes water damage or mold in your home. Trust the experts at HVAC Palo Alto to quickly diagnose the issue and get your system back in top shape.
✅ Fast response times
✅ Licensed & insured HVAC technicians
✅ Serving Palo Alto and surrounding California communities
Call us today at (650) 547-4786  or schedule your AC repair online. Stop the leak before it causes bigger problems!