Fast Affordable Air recently inspected a residential central Air Conditioning system in west Las Vegas near Summerlin. The project included checking the outdoor condenser, inspecting the indoor American Standard air handler, testing the compressor’s electrical insulation, and measuring the air temperature at an indoor vent.
The pictures show why a complete AC diagnosis should involve more than looking at the thermostat. An Air Conditioner has indoor and outdoor parts that must work together. A problem in either area can reduce Cooling, increase electricity use, or cause the system to stop working.
Inspecting the Outdoor Condenser
We started by looking at the outdoor condenser. This is the large metal unit outside the home. It releases the heat that the central AC removes from the indoor air.
The condenser was installed in a narrow area between the house and a block wall. Another outdoor unit was positioned near shrubs. These locations make it important to inspect the available space around the equipment. The outdoor coil needs enough airflow to carry heat away from the refrigerant.
Refrigerant is the special fluid that moves heat through the HVAC system. It absorbs heat inside the home and releases that heat outside.
Leaves, dirt, plants, and nearby walls can restrict airflow when they are too close to the condenser. Restricted airflow can make the compressor run hotter and longer. It may also increase energy use and reduce the amount of cold air delivered inside the home.
During the visual inspection, we checked the condition of the cabinet, coil, electrical disconnect, refrigerant lines, and the area around the outdoor equipment. An electrical disconnect is the safety box mounted near the condenser. It allows power to be shut off before the unit is serviced.
Checking the Indoor American Standard Air Handler
The indoor portion of this Heating and Cooling system was installed above the ceiling. The visible equipment appears to be an American Standard air handler or furnace cabinet.
An air handler contains the parts that move conditioned air through the home. Depending on the system design, it may include a blower motor and an evaporator coil. The blower acts like a powerful fan. It pushes air through the ductwork and out of the supply vents.
We visually inspected the indoor cabinet, nearby insulation, refrigerant piping, wiring, and duct connections. Gaps or loose connections around this area can allow cooled air to escape before it reaches the rooms. Damaged insulation can also let attic heat enter the system.
Testing the Compressor With a Megohmmeter
The next part of the diagnosis involved the compressor. The compressor is often described as the heart of an Air Conditioning system because it pumps refrigerant between the indoor and outdoor sections.
We used an M500 megohmmeter to check the compressor’s electrical insulation. A megohmmeter is a testing tool that sends a controlled test voltage through a motor or compressor winding. It measures how well the electrical parts are protected from leaking electricity to the metal body of the equipment.
The test is measured in megohms. A higher resistance reading generally means the insulation is doing a better job of keeping electricity where it belongs. A low reading can point to moisture, contamination, worn insulation, or a compressor that may be developing an internal electrical problem.
The tester shown in the pictures indicated a reading in its caution range. This does not automatically prove that the compressor has failed. It means the result should be compared with the equipment specifications and other tests before a repair decision is made.
A trained HVAC technician may also check the compressor’s amperage, winding resistance, capacitor, contactor, refrigerant pressures, and operating temperature. Looking at all these results together provides a more accurate diagnosis than relying on one reading.
Measuring the Air Temperature at the Vent
We also used an infrared thermometer at an indoor supply vent. A supply vent is the opening that sends conditioned air into a room. The thermometer displayed approximately 71.4°F during the photographed test.
A single vent temperature does not tell the whole story. To measure Air Conditioner performance correctly, the technician normally compares the temperature of the air entering the system with the temperature of the air leaving it. This difference is commonly called the temperature split.
For example, if 80°F air enters the system and 60°F air leaves it, the temperature split is 20 degrees. The expected result can change based on indoor humidity, airflow, outdoor temperature, equipment design, and the system’s operating condition.
If the supply temperature remains too warm, possible causes may include restricted airflow, a dirty coil, a refrigerant problem, leaking ductwork, an electrical issue, or a compressor that is not operating properly.
Benefits of a Complete Central Cooling Diagnosis
- It helps find developing electrical problems before the AC stops running.
- It protects the compressor from damage caused by heat or poor airflow.
- It helps prevent unnecessary replacement of working equipment.
- It identifies areas where cooled air or energy may be wasted.
- It gives the homeowner better information before approving a repair.
- It can improve indoor comfort when the actual source of weak Cooling is corrected.
Why Several Tests Are Needed
An Air Conditioner can run while still having a hidden problem. It may produce some cool air but operate longer than necessary. That can raise energy bills and place additional strain on the compressor, fan motor, and electrical components.
This is why Fast Affordable Air checks the entire system instead of guessing from one symptom. The company provides air conditioning repair in Las Vegas, Henderson, North Las Vegas, and surrounding Clark County communities.
When a cooling failure happens outside normal business hours, homeowners can also learn about the company’s 24-hour emergency AC service. A careful diagnosis helps determine whether the central Air Conditioner needs an electrical repair, airflow correction, maintenance, or further compressor testing.