AC Repair

A capacitor the size of a soda can can bring your entire air conditioner to a stop. When that small cylindrical component fails, the compressor and fan motor lose the electrical boost they need to start, and your home slowly warms while the system sits silent. This is one of the most common failures we see, and it illustrates why AC repair is often less about replacing a whole unit and more about diagnosing the one part that has stopped doing its job.

Since 1978, Bill Joplin's Air Conditioning & Heating has repaired cooling systems across North Texas. We are a leading residential HVAC contractor serving McKinney and the surrounding communities, and we have spent decades learning how these systems fail, why they fail, and how to bring them back to reliable operation.

How We Diagnose a Cooling Problem

Good repair starts with accurate diagnosis. When we arrive at your home, we do not guess. We begin by confirming what the system is doing and what it should be doing. That means checking the thermostat setting, the state of the breakers, and whether the outdoor condenser is receiving power and running. Many service calls start with symptoms that point in several directions, so we work methodically to narrow the cause.

From there, we move to measurements. We read the refrigerant pressures on both the high and low sides, check the temperature split across the evaporator coil, and test the electrical draw of the compressor and fan motors. These numbers tell us whether the problem is electrical, mechanical, or related to refrigerant charge. A system that cools weakly, for example, might have a dirty coil, a failing compressor, or a low charge caused by a leak. Each of these requires a different repair, so measuring first prevents us from replacing parts that were never the problem.

Common Faults We Correct

Air conditioners fail in patterns, and years of field experience have shown us which faults appear most often in the homes we serve. Understanding these helps you recognize when something is wrong before a small issue becomes a large one.

• Failed capacitors: These small components store and release the electrical charge that starts your compressor and fan motors. When they weaken, the system struggles to start or trips the breaker.
• Refrigerant leaks: Low refrigerant almost always means a leak somewhere in the coil or lines. We find and seal the leak before recharging, because simply adding refrigerant only delays the next failure.
• Contactor problems: This relay controls power to the outdoor unit. Pitted or burned contacts cause intermittent operation or a system that will not start.
• Frozen evaporator coils: Restricted airflow or low refrigerant can cause ice to form on the indoor coil, blocking heat transfer and stopping cooling entirely.
• Clogged condensate drains: When the drain line backs up, water can trigger a safety switch that shuts the system down, or worse, spill into your home.
• Worn blower and fan motors: Bearings wear over time, and a motor that runs hot or noisy is heading toward failure.

Each of these faults produces its own set of symptoms, and we treat the diagnosis as a puzzle to be solved rather than a template to be applied.

Scenarios Where Fast Repair Matters

The value of a quick, correct repair changes with the situation. A family in the middle of a Texas summer feels the loss of cooling within hours, especially when indoor temperatures climb past comfortable levels. Homes with infants, elderly residents, or people with health conditions need reliable cooling to stay safe. In these cases, we prioritize getting the system running again with the correct parts rather than a temporary patch.

Then there are the slow, creeping problems. A system that short-cycles, turning on and off repeatedly, wears itself out faster and drives up energy bills. A unit that runs constantly but never quite reaches the set temperature signals a developing fault that will only get worse. Homeowners often live with these symptoms for weeks before calling, and part of our work is explaining what the system is telling them so they can make an informed decision.

We also handle the aftermath of storms and power surges, which are common in North Texas. A nearby lightning strike or a utility fluctuation can damage the control board, capacitor, or compressor. In these situations, we test each affected component to determine what survived and what needs replacement, so you are not paying for parts that still work.

Our Repair Method, Step by Step

Once we identify the fault, we explain what we found and what the repair involves before we begin any work. Transparency matters, and we want you to understand the condition of your equipment. When you approve the repair, we carry out the work with the correct tools and replacement parts rated for your specific system.

For an electrical repair, we discharge and replace the failed component, then verify that voltages and amperage readings fall within the manufacturer’s specifications. For a refrigerant leak, we locate the leak using electronic detectors or dye, repair the affected joint or coil, pull a vacuum on the system to remove moisture and air, and recharge to the exact weight the manufacturer specifies. Charging by weight rather than guesswork is important because both overcharging and undercharging reduce efficiency and shorten equipment life.

After any repair, we run the system through a full cycle and confirm that it is cooling properly. We recheck the temperature split, listen for unusual noises, and make sure the condensate drains freely. We do not consider a job finished until the system performs the way it should.

Technical Details That Guide the Work

Every repair we make follows the numbers your equipment was designed around. A properly operating air conditioner typically produces a temperature drop of 16 to 22 degrees between the return air and the supply air. Refrigerant pressures vary by system and outdoor temperature, but they follow predictable ranges tied to the type of refrigerant your unit uses, whether that is the older R-22 or the current R-410A.

We also pay close attention to airflow, because most cooling problems trace back to it in some way. A dirty filter, collapsed duct, or blocked coil restricts the air moving across the evaporator, which affects everything downstream. When we repair a system, we check that airflow supports the equipment’s rated capacity, because a repair that ignores airflow simply invites the same failure to return.

Matching parts correctly is just as important. A replacement capacitor must match the microfarad rating and voltage of the original. A replacement motor must match the horsepower, rotation, and mounting of the one it replaces. These specifications are not suggestions, and using the wrong part causes premature failure or unsafe operation.

Serving McKinney and the Surrounding Communities

Bill Joplin's Air Conditioning & Heating provides AC repair, AC installation, furnace repair, and heater repair throughout Mckinney, Allen, Melissa, Prosper, Fairview, Lucas, Plano, and Princeton, TX. Our long history in this region means we understand the demands the local climate places on cooling equipment, from the extended summer heat to the sudden storms that can damage electrical components.

Whether your system has stopped cooling entirely or simply is not performing the way it used to, we bring the same careful diagnosis and honest repair to every call. Our goal is to keep your equipment running efficiently for as long as possible, and to give you a clear understanding of its condition so you can plan ahead. When you need dependable AC repair backed by decades of experience, Bill Joplin's Air Conditioning & Heating is ready to help.