As temperatures rise in the Northbrook area, homeowners rely on their air conditioning systems to keep their homes cool and comfortable. However, when an AC unit struggles to maintain the desired temperature or fails to cool efficiently, it can make summer days unbearable. Fortunately, an AC repair company in Northbrook, Illinois can diagnose common air conditioning issues and restore your system to ensure reliable cooling throughout the hottest months.

Air conditioners are designed to handle heavy cooling demands, but various factors can reduce their efficiency over time. Understanding why an AC unit isn’t keeping up with the heat can help homeowners avoid discomfort and costly energy bills.

Common Reasons Why an AC System Fails to Cool Properly

When an air conditioner isn’t providing sufficient cooling, several factors could be responsible. Identifying these issues early can help prevent major system breakdowns.

1. Dirty or Clogged Air Filters

A clogged air filter is one of the most common reasons for poor AC performance. Air filters trap dust, pollen, and debris, preventing them from circulating through the system. Over time, these filters become clogged, restricting airflow and reducing cooling efficiency.

What to Do:

• Check and replace air filters every one to three months.
• If airflow is weak, schedule a professional AC inspection to determine if the issue extends beyond the filter.

2. Low Refrigerant Levels

Refrigerant is essential for cooling the air inside an AC system. If refrigerant levels are low due to a leak or improper charging, the unit may struggle to cool the home effectively.

Signs of Low Refrigerant:

• Warm air coming from vents.
• Ice buildup on refrigerant lines.
• Increased humidity levels indoors.

A professional AC repair company in Northbrook, Illinois can locate refrigerant leaks, repair them, and recharge the system to restore cooling performance.

3. Dirty or Blocked Condenser Coils

The outdoor condenser unit plays a critical role in heat transfer. If the coils become covered in dirt, leaves, or debris, the AC system will struggle to release heat, reducing its ability to cool efficiently.

What to Do:

• Keep the area around the outdoor unit clear of obstructions.
• Schedule professional maintenance to clean and inspect the condenser coils.

4. Faulty Thermostat

A malfunctioning thermostat can cause temperature inconsistencies, making it difficult for the AC system to maintain a comfortable indoor climate.

What to Do:

• Check thermostat settings and ensure it is set to “cool.”
• Replace thermostat batteries if necessary.
• Upgrade to a programmable or smart thermostat for better temperature control.

A professional AC repair company in Northbrook, Illinois can assess thermostat functionality and recommend necessary upgrades or repairs.

5. Leaky or Poorly Insulated Ductwork

Ducts distribute cooled air throughout the home, but if there are leaks or poor insulation, much of that air can escape before reaching the intended spaces.

Signs of Duct Problems:

• Uneven cooling in different rooms.
• Higher energy bills without an obvious cause.
• Visible gaps or damage in ductwork.

Sealing duct leaks and adding insulation can improve airflow and cooling efficiency.

6. Oversized or Undersized AC Unit

An improperly sized AC unit can struggle to cool a home efficiently. A unit that is too small will run continuously without reaching the set temperature, while an oversized unit may short-cycle, leading to frequent on-and-off operation without effective cooling.

A professional AC technician can assess whether a system is properly sized for a home’s cooling needs.

Looking for an AC Repair Company in Northbrook, Illinois?

An air conditioner that isn’t keeping up with the heat can lead to discomfort and high energy bills. Whether dealing with weak airflow, refrigerant leaks, or system inefficiencies, professional AC repair services help restore your home.

As the leading AC repair company in Northbrook, Illinois, our team at John J. Cahill Plumbing, Heating & Air Conditioning can diagnose and fix all types of AC problems, ensuring your homes remain cool and comfortable throughout the summer. Contact us today at 847-864-5225 to schedule a service.