AC Troubleshooting Guide: Common Issues and Solutions

Summertime in Red Lion, means your air conditioning system is working overtime. With the heat and humidity peaking in July and August, it’s no surprise that many homeowners experience problems with their AC units. 

Whether you’re dealing with weak airflow, warm air, or strange leaks, it’s important to know when a quick fix will do—and when it’s time to call in the professionals at H.L. Bowman.

Here’s your go-to guide for troubleshooting common air conditioning issues during the summer months—and keeping your home cool and comfortable all season long.

1. AC Blowing Warm Air

There’s nothing more frustrating than an air conditioner but not cooling. If your vents are blowing warm or room-temperature air, start with these simple steps:

Check the Thermostat

Make sure your thermostat is set to “cool” and not “fan.” It sounds basic, but it’s one of the most common reasons for warm airflow. Another common issue is that someone in your household may have adjusted the thermostat to a higher temp.

Inspect the AC Air Filter

A clogged filter restricts airflow and can cause the system to overheat, forcing it to blow warm air. Change your filter every 1 to 3 months during heavy summer use to ensure optimal performance.

Look at Outside AC Unit

Check your outdoor unit (condenser). If it’s covered in leaves, dirt, or debris, it may not be able to release heat properly. Gently clear away debris or spray the coils with a garden hose—never use a pressure washer.

When to Call HL Bowman:

If your filter is clean and your thermostat is working correctly, the issue could be with a refrigerant leak, a bad compressor, or a frozen evaporator coil—issues best handled by licensed HVAC professionals.

2. Uneven Cooling Between Rooms

If some rooms in your home are comfortable and others feel like a sauna, your AC may be struggling with airflow distribution.

Open All Vents

Be sure all vents in your home are open and unobstructed. Furniture, rugs, or drapes can block airflow and prevent even cooling.

Check for Leaky Ducts

Ductwork hidden in your attic or walls can sometimes develop leaks, allowing cooled air to escape before it reaches certain rooms. While DIY duct sealing kits exist, this is often a job for a professional.

Use Ceiling Fans Wisely

Set ceiling fans to spin counterclockwise during the summer to help circulate cold air more effectively throughout your home.

When to Call HL Bowman:

Persistent uneven cooling could point to improper duct design, an aging system, or a failing blower motor. An HVAC inspection will help pinpoint the root cause and offer targeted solutions.

3. Condensation or Water Leaks

Seeing water around your indoor unit? That could signal a clogged drain line or another issue with your AC system’s drainage.

Clear the HVAC Condensate Line

Over time, the line that removes condensation can become clogged with mold or debris. You can try flushing it out with a mixture of vinegar and water. If water keeps backing up, professional cleaning is likely needed.

Check the AC Drain Pan

The drain pan beneath the indoor unit can rust or crack, leading to leaks. If it’s damaged, it will need replacement.

When to Call HL Bowman:

Any active leaking should be addressed quickly to prevent mold growth and water damage to your home. If you’re seeing persistent puddles or musty smells, schedule a service call.

4. AC Keeps Turning On and Off (Short Cycling)

Short cycling can be a sign of a deeper issue. It stresses your system and reduces efficiency.

Replace HVAC Air Filter

Restricted airflow from a dirty filter is a common cause of short cycling.

Check Your Thermostat Location

If your thermostat is near a window or heat source, it may think your home is hotter than it is, causing the system to cycle unnecessarily.

When to Call HL Bowman:

Short cycling could indicate problems with your system’s control board, refrigerant levels, or oversized equipment. Our technicians can inspect the system and recommend long-term fixes.

Prevent Problems With a Proactive HVAC Maintenance Plan

Many of the issues listed above can be avoided entirely with regular maintenance. At HL Bowman, we offer customized HVAC maintenance plans that keep your AC in peak condition year-round.

Benefits of Regular AC Maintenance:

• Improve energy efficiency
• Extend system lifespan
• Reduce breakdowns and emergency repairs
• Maintain consistent indoor comfort
• Ensure your system is ready for high summer demand

Our maintenance plans include full seasonal inspections, priority service, discounted repairs, and peace of mind knowing your home’s comfort is in expert hands.

Trust HL Bowman for Reliable AC Service

When basic troubleshooting isn’t enough, don’t wait for a total breakdown—call the experts at H.L. Bowman. We’ve been helping Red Lion, PA, and the surrounding areas stay cool since 1946. Our certified HVAC technicians offer fast, friendly, and reliable AC repair, maintenance, and replacement services.

Need service now? Request service online or give us a call at 717-287-5504—we’re here to keep your home cool and comfortable all summer long.