AC Unit Problem

7 Reasons Your AC Is Not Cooling the House Properly

Key Takeaways

  1. Ensuring regular air filter changes and clearing debris are essential steps for maintaining optimal cooling performance and enhancing energy efficiency.
  2. Identifying the root cause of AC issues before attempting repairs is essential to avoid further damage.
  3. Low refrigerant levels, dirty filters, and faulty components are common culprits behind AC malfunctioning.
  4. Neglecting AC maintenance can lead to reduced cooling capacity, increased energy consumption, and potential system breakdowns.
  5. Calling professional AC repair technicians for complex issues or electrical repairs ensures safe and effective solutions, saving time and avoiding DIY pitfalls.

As the temperature climbs and the sun’s fiery rays make their presence known, our trusty companion, the air conditioning (AC) unit, emerges from its winter slumber. It’s time for our AC systems to step up their game and keep us cool and comfortable during the scorching days ahead.

AC Unit problems become more common as we enter the warmer months, leaving us in a sticky predicament. The role of air conditioning units in our homes cannot be overstated. They are our shields against the blazing sun, the guardians of coolness that provide respite from the sweltering heat. But we yearn for a cool oasis when they falter, leaving us in a stifling heat.

Daigle Plumbing, Heating & Cooling delves into Why your AC is not cooling the house. We uncover the reasons behind these cooling problems, exploring the reasons why your AC unit may be misbehaving. We unravel the AC malfunctions from insufficient refrigerant levels to clogged air filters. We will also offer practical maintenance tips to keep your AC running smoothly and insights into why calling professional AC repair technicians might be your best bet.

Reasons Why Your AC System Is Not Working Properly

Insufficient Refrigerant Levels

One possible reason for your AC’s lackluster performance is low refrigerant. Signs of this issue include weak airflow and warm air coming from the vents. Low refrigerant levels can stem from leaks or improper initial charging. Contact an experienced AC repair technician to pinpoint the leak’s origin, conduct necessary repairs, and restore the system to its optimal refrigerant level.

Dirty or Clogged Air Filters

Your AC’s air filters are vital in maintaining proper airflow and indoor air quality. Over time, these filters can clog with dust, dirt, and debris, hindering the cooling process. Check and clean the filters regularly or replace them as needed. This simple step can reduce your AC unit problem and energy consumption by 5% to 15%.

Faulty Thermostat

A malfunctioning thermostat can cause temperature inconsistencies and an inefficient cooling cycle. If you notice temperature variations or your AC doesn’t respond to thermostat adjustments, it might be time for a thermostat replacement. Enhance your control over temperature settings and boost energy efficiency by upgrading to a smart thermostat.

Blocked or Damaged Condenser Unit

The condenser unit can accumulate debris or suffer damage from external factors. Obstructions like leaves, dirt, or even a neighboring shrub can impede airflow and hinder cooling, leading to AC unit problems. Clear any obstructions and ensure proper clearance around the unit. If the condenser unit is damaged, consult a professional for repair or replacement.

Malfunctioning Compressor or Fan Motor

The compressor and fan motor are vital for circulating refrigerant and air. If either fails, your AC won’t be able to cool effectively. Symptoms may include strange noises, irregular cycling, or warm air blowing from the vents. These AC unit problems require professional attention and repair or replacement of faulty components.

Ductwork Leaks or Improper Insulation

Leaking ducts or inadequate insulation can cause cool air to escape before it reaches your living spaces. This inefficiency can make your AC work harder and compromise its cooling capabilities. Inspect your ductwork for leaks or hire a professional to assess and seal any gaps. Additionally, ensure proper insulation in your home to minimize heat transfer.

Electrical Issues or Faulty Wiring

Electrical problems can wreak havoc on your AC’s functionality. Faulty wiring, tripped breakers, or damaged capacitors can disrupt the electrical flow and cause your unit to underperform or not work. Leave electrical repairs to qualified professionals who can safely diagnose and fix these issues.

AC Maintenance Tips

Regular maintenance is the key to preventing AC unit problems and maximizing your cooling system’s performance. By investing a little effort into upkeep, you can ensure that your AC keeps you comfortably cool when the heat is on. Here are some essential maintenance tips to keep your AC running smoothly:

Changing or Cleaning Air Filters Regularly

Dirty air filters restrict airflow, making your AC work harder and less efficiently. Replace or clean your filters every month or two, depending on the type of filter and usage. This simple task improves air quality, prevents dust buildup, and enhances your AC’s overall performance.

Clearing Debris from The Condenser Unit

Your AC’s outdoor condenser unit can accumulate leaves, grass clippings, and other debris over time. Check the unit regularly and remove any obstructions to ensure optimal airflow. A clean condenser unit allows for efficient heat exchange and helps prevent overheating or compressor damage.

Checking and Cleaning the Evaporator Coils

Make it a habit to inspect the evaporator coils in your AC annually as they tend to accumulate dirt and dust, hindering their heat absorption capability. If needed, gently clean them using a soft brush to remove debris. Clean coils facilitate heat transfer, improving cooling efficiency and reducing energy consumption.

Inspecting and Cleaning the Condensate Drain Line

The condensate drain line channels moisture away from your AC unit. However, it can accumulate algae, mold, or debris over time, resulting in blockages and potential water leakage. Regular inspection and cleaning is necessary to prevent costly repairs and ensure proper drainage.

Ensuring Proper Airflow by Keeping Vents and Registers Unobstructed

Blocked vents and registers disrupt airflow and hinder cooling. Check that furniture, curtains, or other objects are not obstructing the airflow. Clear away any obstructions to allow unrestricted air circulation throughout your home.

Scheduling Professional Maintenance at Least Once a Year

While homeowners can handle some maintenance tasks, it’s essential to have a professional AC repair technician perform a maintenance check at least once a year. They can inspect and service critical components, detect potential issues early on, and optimize your AC’s performance. Professional maintenance helps extend the lifespan of your AC system and ensures its efficiency.

Related: Why Is My Air Conditioner Freezing Up?


Regular AC maintenance and timely repairs are essential to ensure your cooling system performs optimally when the heat strikes. You can restore the cool comfort you deserve by addressing issues such as low refrigerant levels, dirty filters, and faulty components. Incorporate the recommended maintenance tips into your routine and consider seeking professional assistance.

Choose Daigle Plumbing, Heating & Cooling for Your AC Needs

Ready to restore the cool comfort in your home? Trust Daigle Plumbing, Heating & Cooling, serving Nashua, NH, for all your AC needs. From maintenance to repairs, our expert technicians are here to help. Don’t let a malfunctioning AC ruin your summer. Contact us today for a free estimate.