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When you turn on your air conditioner for the first time in spring, it can be frustrating if your central air is running but not cooling. Many homeowners notice their central air not blowing cold air after winter, especially if the system hasn’t been used for several months.

If your central air is not cooling, there are several common issues that could be causing the problem. Understanding these causes can help you determine whether it’s a simple fix or if it’s time to call a professional HVAC technician.

1. Thermostat Settings May Be Incorrect

One of the first things to check when your central air is not blowing cold air is the thermostat. During winter, thermostat settings are often changed to heating mode and may not have been switched back properly.

Make sure:

• The thermostat is set to COOL
• The temperature is set below the current room temperature
• The fan is set to AUTO

Incorrect thermostat settings are one of the simplest reasons for central air not cooling after winter.

2. Dirty Air Filter Restricting Airflow

A clogged air filter can significantly reduce airflow and prevent your system from cooling your home properly. If your central air is running but not cooling, a dirty filter is one of the most common causes.

A clogged filter can cause:

• Weak airflow from vents
• Reduced cooling performance
• Higher energy bills

Replacing your filter every 1–3 months helps prevent problems with central air not cooling and keeps your system operating efficiently.

3. Outdoor AC Unit Blocked by Debris

Over the winter months, leaves, dirt, and debris often accumulate around the outdoor condenser unit. When airflow is restricted, your central air may run but not cool properly.

Check the outdoor unit for:

• Leaves or debris around the base
• Dirt buildup on condenser coils
• Plants or objects blocking airflow

Keeping the outdoor unit clear can help restore cooling if your central air is not blowing cold air.

4. Low Refrigerant Levels

If your AC is not working after winter, low refrigerant could be the cause. Refrigerant is responsible for removing heat from your home. When levels drop due to a leak, your central air can run but not cool effectively.

Signs of low refrigerant include:

• AC running continuously
• Air not getting cold
• Ice on refrigerant lines
• Hissing or bubbling noises

Low refrigerant requires professional repair from an HVAC technician.

5. Frozen Evaporator Coil

A frozen evaporator coil is another common reason for central air running but not cooling. This usually happens when airflow is restricted or refrigerant levels are low.

Signs of a frozen coil include:

• Ice buildup on indoor coils
• Reduced airflow from vents
• Warm air coming from the AC system

If your central air is not blowing cold air, turning the system off and allowing it to thaw may temporarily help, but a professional inspection is recommended.

6. Electrical or Capacitor Issues After Winter

Air conditioners sit unused for months during winter, which can sometimes lead to electrical issues. If your central air is running but not cooling, a failed capacitor or contactor could prevent the outdoor unit from operating properly.

Symptoms may include:

• Outdoor unit not running
• AC blowing warm air
• System starting but not cooling

Electrical repairs should always be handled by a licensed HVAC professional.

When to Call an HVAC Professional

If you’ve checked the basic issues and your central air is still not cooling, it’s best to have your system inspected by an experienced technician.

At Renaud Brothers Heating & Cooling, we help homeowners diagnose and repair issues when their central air is not blowing cold air. Whether your AC is not working after winter or your central air is running but not cooling, our team can quickly identify the problem and restore comfort to your home.

Scheduling a spring AC inspection can also help prevent unexpected breakdowns during the hottest months of the year.

Contact Renaud Brothers Heating & Cooling today to schedule AC service and get your system running efficiently again.