If you’ve ever found water pooling under your HVAC system, your AC drain pan may be to blame. Though it’s a small part of your air conditioning system, the drain pan plays a big role in preventing water damage in your home.
In West Sacramento’s warm, dry climate, air conditioners often work overtime. That heavy use increases the chances of wear and tear, especially in parts like the condensate drain system. This guide explains what an AC drain pan is, what it does, and how to tell if yours needs service or replacement.
What Is an AC Drain Pan?
An AC drain pan, sometimes called a condensate pan, is a shallow metal or plastic tray located beneath the evaporator coil in your indoor unit. As warm air flows over the coil, moisture condenses and drips into the pan. From there, the water exits your home through a connected drain line.
There are typically two types:
- Primary drain pan: Built into the air handler or coil cabinet
- Secondary (auxiliary) pan: Installed as a backup beneath the unit, often with a safety switch
Both are designed to handle water created during normal cooling cycles.
Why It’s Important
The drain pan protects your home from water damage caused by the normal condensation process. Without it, moisture could collect around your system, damage flooring, cause mold growth, or impact electrical components.
Key reasons your AC drain pan matters:
- Prevents standing water from damaging surrounding areas
- Helps direct water safely into the drainage system
- Triggers shut off if overflow occurs (when paired with a float switch)
- Plays a role in indoor air quality by limiting excess humidity
Even a small crack or clog in this area can lead to bigger problems if left unaddressed.
Common Issues That Cause Leaks
If you notice water around your HVAC unit, your drain pan or connected components may be compromised. Common causes include:
- Rusted drain pan: Over time, metal pans corrode due to age and exposure to moisture
- Cracks in plastic pans: Temperature fluctuations can cause brittle plastic to crack
- Clogged condensate line: Debris buildup can prevent water from draining properly
- Improper installation: If the pan isn’t level, water may collect and spill
- Algae or mold growth: These blockages often form in the drain line or pan over time
In West Sacramento, where dust and dry conditions can lead to buildup, it’s important to check the system regularly during peak cooling months.
How to Know If Yours Needs Replacing
Knowing when to replace an AC drain pan isn’t always obvious. But certain warning signs suggest it may be time to call for Sacramento HVAC repair:
- Visible rust or cracks in the pan
- Standing water under your indoor unit
- A musty smell is coming from your vents
- The AC shuts off unexpectedly due to float switch activation
- Repeated clogging in the condensate line despite cleanings
While some issues can be fixed with cleaning or sealing, a damaged or aged pan often requires full replacement to prevent future leaks.
If you’re not sure how to check your system, you can inspect your AC drain pan manually or have a technician do it as part of routine maintenance.
Schedule an AC Inspection with Gilmore
At Gilmore Air, we help West Sacramento homeowners prevent water damage before it starts. Our trained technicians inspect, clean, and repair AC drain pans as part of full cooling system evaluations.
During a service visit, we’ll:
- Check your drain pan for rust, cracks, or improper fit
- Clear out any clogs in the condensate line
- Test for leaks and shutoff switch activation
- Recommend repairs or replacement if needed
We also take the time to explain what we find, so you can make informed decisions about repairs, pan replacement, or long-term system care.
Whether you’re dealing with a leaking HVAC or just want to prevent future issues, our team is ready to help. If your system has signs of wear or you’re noticing water under your furnace, don’t wait. Scheduling an inspection now can help protect your home all summer long.
