Air conditioning problems always seem to happen at the worst possible time, especially here in Southeast Louisiana when the heat and humidity are not giving anybody a break.
The good news is that some of the most common A/C issues do not automatically mean the system needs to be replaced. Sometimes the issue is simple maintenance. Sometimes it is a minor repair. Sometimes it needs a professional diagnosis, but even then, it may not be as bad as you think.
As home inspectors, we are not HVAC contractors, and we are not here to sell you an A/C repair. Our job is to help homeowners and buyers better understand what they are seeing so they can ask better questions, make better decisions, and know when it is time to bring in the right professional.
In This Article
1. Water Is Leaking Around the Indoor A/C Unit
This is probably the most common A/C-related issue we run into.
A lot of homeowners notice water around the indoor unit and immediately think something major is wrong. Sometimes that is possible, but by far one of the most common causes is a clogged condensate drain line.
Here is what is happening.
When your air conditioner runs, it does more than cool the air. It also removes moisture from the air. That moisture collects inside the system and is supposed to drain safely to the exterior of the home through a condensate drain line.
Over time, especially in a humid area like Southeast Louisiana, that drain line can get clogged with algae, slime, dirt, dust, or debris. When the water cannot drain the way it is supposed to, it can back up into the pan and eventually overflow.
That is when homeowners start seeing water around the unit, stains on the ceiling, wet insulation, or moisture in areas where water should not be.
Did You Know?
Inspector Insight
Water around an indoor A/C unit is something you do not want to ignore. Even if the A/C repair itself is minor, the water damage around it may become the bigger problem if it continues for too long.
In many cases, the repair is fairly straightforward. An HVAC technician can clear the drain line, flush it, and verify that water is draining properly again.
This is also where simple preventative maintenance can go a long way.
Helpful Tip
Pro Tip: A/C Drain Pan Tablets
One helpful maintenance item is an A/C drain pan tablet. These tablets are placed in the condensate drain pan and are designed to help reduce algae, sludge, odors, and buildup that can contribute to clogged drain lines.
They are inexpensive and can be a helpful preventative item during cooling season. Some manufacturers recommend placing tablets in the pan monthly, while others advertise protection for up to three months, so always follow the instructions for the specific product you use.
Just remember: drain pan tablets are preventative. They are not a fix for an existing clog. If the system is already leaking, backing up, or overflowing, it is time to have the drain line inspected and cleaned by a qualified HVAC professional.
When It Is Time to Call a Professional
If water is actively leaking, the pan is full, the ceiling is stained, or the system keeps shutting off, go ahead and call an HVAC technician. This is usually not something to keep watching for weeks.
The repair may be simple, but the water damage may not be if it continues.
Quick Look: Common Repairs & Typical Costs
| Repair | Typical Cost |
|---|---|
| Clear clogged condensate drain line | $75–$250 |
| HVAC maintenance or tune-up visit | $100–$200 |
| Replace condensate pump, if equipped | $240–$450 |
Typical costs are national averages for general budgeting only. Pricing can vary based on system type, access, labor rates, and the contractor.
2. The Drain Pan Is Rusted or Damaged
Another common issue we see is a rusted, cracked, or damaged drain pan.
The drain pan is there to hold and direct condensation so it can safely drain away from the system. The problem is that the pan spends its life around water. Over time, especially on older systems, that pan can rust, crack, shift, or start leaking.
When that happens, the best thing to do is go ahead and call your A/C technician and have them replace the drain pan.
The pan itself is usually not the expensive part. Many drain pans are relatively inexpensive as parts, but the labor and accessibility are what affect the total repair cost. If the unit is easy to access, the repair may be fairly simple. If the pan is underneath the evaporator coil, inside an attic, or difficult to reach, the repair can take more time.
In some cases, replacing the pan may include removing the old pan, carefully lifting or supporting the existing unit or coil, sliding the new pan underneath, and making sure it is properly supported. In other situations, the pan may need to be reattached to its mounting straps or supports.
The important thing is that the new pan needs to be properly installed, properly supported, and properly angled so water drains the way it is supposed to.
Did You Know?
Inspector Insight
A new drain pan does not help much if it is installed flat, pitched the wrong way, or not properly connected to the drain line. The goal is not just to hold water. The goal is to move water safely away from the system.
As always, if you are not sure what you are looking at, consult a licensed professional for help. This is especially true when the unit is located in an attic or above a finished ceiling where a leak can cause expensive damage.
When It Is Time to Call a Professional
Call an HVAC professional if the drain pan is rusted through, cracked, leaking, improperly supported, or holding standing water. You should also call if the pan is located in an attic or above a finished area where water damage could become a bigger issue quickly.
Quick Look: Common Repairs & Typical Costs
| Repair | Typical Cost |
|---|---|
| Replace secondary drain pan | $250–$600 |
| Replace primary evaporator drain pan | $600–$1,200 |
| Complex drain pan replacement with difficult access or added disassembly | $1,200+ |
Typical costs are national averages for general budgeting only. The final cost can change based on system design, access, warranty coverage, and whether additional repairs are needed.
3. The A/C Is Running, But the House Is Not Cooling
This is often the most worrisome A/C issue for homeowners.
The system sounds like it is running, but the house is not cooling the way it should. Before assuming the worst, there are a few key questions that help narrow things down.
- How old is the A/C unit?
- Is the outside unit running?
- Is the indoor fan blowing air?
- Is the outside fan turning on and off?
- Is the system running constantly but not lowering the temperature?
When an A/C unit is not cooling, it could be a damaged component in the system. It could also be something more routine, like a dirty filter, a failed capacitor, a refrigerant issue, or another part that needs professional diagnosis.
Air conditioners work by moving heat, not by creating cold air out of nowhere. The system uses refrigerant to absorb heat from inside the home and release that heat outside. The outdoor unit helps remove the heat, and the indoor coil helps cool and dehumidify the air going back into the house.
For heat pump systems, that process can reverse when the system is being used for heat.
This is where a professional can help. HVAC technicians have specialized gauges, meters, and testing equipment they can connect to the system to check refrigerant pressures, electrical components, airflow, and overall performance.
Common Inspection Concern
Rock Solid Recommendation
Just know this does not always mean the unit needs to be replaced. Even with an older unit, the issue may be a repairable component, a refrigerant concern, or a slow leak that has developed over time.
A low refrigerant level does not mean the refrigerant was simply “used up.” A properly operating system should not be losing refrigerant. If refrigerant is low, there is usually a leak somewhere, even if it is a small one.
That does not mean you should panic. It just means the system needs to be properly evaluated.
Either way, the best thing to do in this scenario is not to worry, but to get more information. The repair could be much less serious than you expect.
As always, consult a trusted HVAC professional who will shoot straight with you about what the unit actually needs so today’s issue does not become an emergency in the future.
When It Is Time to Call a Professional
Call an HVAC professional if the system is running but not cooling, blowing warm air, short cycling, freezing up, leaking, or struggling to keep up with normal thermostat settings.
This is not the time to guess. The system needs a proper diagnosis.
Quick Look: Common Repairs & Typical Costs
| Repair | Typical Cost |
|---|---|
| Refrigerant recharge | $200–$750 |
| Refrigerant leak repair | $250–$1,500 |
| Compressor replacement | $800–$3,000+ |
Typical costs are national averages for general budgeting only. Refrigerant type, leak location, equipment age, warranty coverage, and system accessibility can significantly affect pricing.
Bottom Line
Most air conditioner problems do not automatically mean you need a new HVAC system.
Sometimes the issue is a clogged drain line. Sometimes it is a rusted drain pan. Sometimes the system needs a professional diagnosis to figure out why it is not cooling properly.
The main thing is to pay attention early, ask good questions, and bring in the right professional when needed.
For homeowners and buyers in Southeast Louisiana, A/C performance, moisture control, and drainage matter. Our climate is hard on homes, and small issues can turn into larger problems when water, humidity, and deferred maintenance are involved.
At Rock Solid Inspections, our job is not to replace your HVAC contractor. Our job is to help you better understand the home so you can make a confident decision about what to do next.