10 Possible Reasons Why Your AC Unit Stops Blowing Cold Air

Air conditioning units are essential for keeping indoor environments comfortable and healthy, especially in warmer climates. By managing both temperature and moisture levels, these systems contribute significantly to our well-being. Nonetheless, like all mechanical equipment, AC units can encounter issues, including when the AC unit isn’t blowing cold air.

Addressing these problems swiftly is essential to avoid discomfort, potential health risks, and expensive repairs. Recognizing the critical role of cooling systems and the consequences of their malfunctions is crucial in taking timely and effective actions to maintain their efficiency and comfort.

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10 Common Causes Why Your AC Isn’t Cooling

Here’s a guide from Wilcox Energy on what to inspect if your AC unit isn’t blowing cold air, along with strategies for fast resolution:

1. The Thermostat is Not Set Correctly

homeowner setting home thermostat using smart phone

Air conditioning systems activate only when the indoor temperature surpasses the set point on the thermostat. Ensure your thermostat is on “auto” and set to “cool,” which will trigger the system to operate as needed. The initial step should always be to verify that the thermostat is programmed to the appropriate temperature. Sometimes, the unit may not cool if mistakenly set to “heat.”

If your thermostat was tampered with during recent maintenance, it might need resetting. Switch it to “heat” and then back to “cool.” After adjusting, wait a few minutes and check if cold air is coming from the vents.

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2. Dirty HVAC Air Filter

Regular inspection and replacement of your air filters are crucial. Neglecting this can lead to severe clogging. Clogged air filters restrict the airflow into your residence, diminishing efficiency and harming critical components of your air conditioning system, such as the evaporator coil.

Consequently, this congestion fails to effectively filter out airborne particles, leading to increased dust, a stuffy atmosphere in your home, and reduced cooling. To avoid these issues, check your air filters monthly and clean or change them as needed.

3. Dirty or Clogged Air Conditioner Condenser

old residential air conditioner depicting dirty or clogged condenser

If your central air conditioner emits warm air, the problem might lie in a dirty or clogged condenser coil. During the cooling process, the condenser fan draws air through this coil located in the outdoor unit to expel heat from your home. Over time, the coil may accumulate dirt, grass clippings, and other airborne debris, blocking airflow and reducing the system’s efficiency. Such obstructions can significantly drop energy efficiency and even result in system failure or compressor damage due to excessive strain.

Clear any dust and grime from the condenser coil. You can remove debris using a brush, vacuum with a brush attachment, or gently wash it down with a hose. For a thorough cleanup and maintenance, consider enlisting the expertise of a professionally certified heating and cooling specialist.

Don’t let a malfunctioning cooling system disrupt your comfort. Contact Wilcox Energy for expert air conditioner repairs and maintenance.

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4. Mechanical HVAC Issues

Over time, like any machinery, cooling units experience normal wear and tear, which can cause mechanical issues. Familiarizing yourself with how your AC operates is beneficial in preventing these problems from developing.

Start by checking simple components such as the thermostat and air filter. If your air conditioner is underperforming or not running for its usual duration, it’s time to call in your HVAC professional. Promptly arranging an inspection of your system’s internal components ensures they are functioning correctly.

5. Air Conditioner Refrigerant Leak

Wilcox Energy HVAC technician assessing refrigerant leak

A refrigerant leak is a common cause behind a central air conditioning system failing to deliver cold air. Refrigerants are crucial chemical coolants that enable your AC unit to produce cool air. This coolant circulates through the indoor and outdoor coils, transforming from a liquid to a gas as it operates. During this cycle, it absorbs heat and humidity from the air inside your home and releases it outdoors.

Usually, the refrigerant levels in an AC system should remain constant. However, if there’s a leak in the refrigerant lines, the system won’t have sufficient coolant to produce cool air. It’s crucial to remember that handling refrigerant repairs on your own is inadvisable. Refrigerants are chemicals regulated by the EPA, requiring certified experts for management. Your HVAC technician has the appropriate tools to identify and mend refrigerant leaks effectively. They can also refill the coolant to ensure your home stays cool and comfortable.

6. HVAC Ductwork Leak

Leaks in the ducts can result in substantial losses, as cold air may escape into the walls instead of flowing through the vents. This issue is broader than the cooling season; you’ll likely experience similar losses with your heating during the winter.

Identifying a leak in the ductwork can be challenging and, if unresolved, costly in terms of lost cooling and heating and increased repair expenses. For these reasons, it’s best to contact a trusted HVAC professional.

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7. AC Unit Evaporator Coil Complications

The evaporator coil, an essential indoor part of your air conditioning system, is crucial in removing heat energy and humidity from the air. When the system’s refrigerant levels drop, these coils can freeze, accumulating frost. This issue not only impedes the production of cold air but can also lead to increased energy costs. It is advisable to avoid attempting repairs on your own due to the complexity of accessing and handling the evaporator coil. Instead, this task should be left to an HVAC professional.

8. Blocked HVAC Vents

Wilcox Energy technician installing new ducts for air conditioning system

Obstructions in the vents can negatively impact your HVAC system, much like a clogged air filter does. Vents are crucial for pulling air into the system and distributing cool air throughout your home. Any blockage can significantly strain the air conditioning system’s efficiency.

Should an obstruction occur near a vent, you might notice that the room with the blocked vent feels warmer than other areas of the house. It’s vital to address this issue promptly by contacting your trusted cooling technician.

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9. Undersized Air Conditioning Unit

Air conditioning units are measured by BTUs, which reflect their cooling capacity. An undersized AC unit often struggles to maintain cool temperatures as outdoor heat increases, forcing the unit to operate excessively. This accelerates wear and tear and may lead to premature replacement.

One viable solution for homes with an inadequate air conditioner is installing a ductless mini-split system. This option targets specific hot spots in your home for effective cooling. However, the most comprehensive solution is to upgrade to a central air conditioner that is correctly sized for your space.

10. Neglecting Regular Air Conditioner Maintenance

no sign held up depicting neglect for HVAC maintenance

To guarantee that your air conditioner operates efficiently and cools your home effectively, it is essential to schedule an annual tune-up or maintenance check. Regular maintenance helps reduce energy costs and allows for the early detection and resolution of existing and potential issues. 

Conclusion

Experiencing air conditioning problems during the sweltering summer months can be immensely frustrating. The reasons behind poor AC performance can vary widely, from straightforward issues such as blocked filters and incorrect thermostat settings to more complex problems like refrigerant leaks and compressor malfunctions. When the AC unit isn’t blowing cold air, hire a certified HVAC technician to professionally handle these challenges to ensure accurate diagnosis and effective resolution.

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Reach Out to Wilcox Energy for All Your HVAC Needs

Wilcox Energy is the premier provider of heating and cooling services along the Southern Connecticut shoreline. Our highly trained and professionally certified HVAC technicians excel in HVAC tune-ups, repairs, installations, and replacements. Rest assured, we are committed to delivering top-tier services to each client.

At Wilcox Energy, we recognize the importance of maintaining a comfortable and energy-efficient home. That’s why we offer competitive pricing on all our services. Our maintenance solutions are designed to maximize your comfort and minimize your energy costs. Whether you need an HVAC repair or are considering a system upgrade, our knowledgeable technicians will provide expert recommendations tailored to your budget. We stand by our work with a satisfaction guarantee.

Call us to arrange a service visit. We provide free, in-home estimates to help you make well-informed decisions about your HVAC systems. Rely on Wilcox Energy to deliver exceptional heating and cooling solutions surpassing your expectations!

For more information about our heating oil deliveries or HVAC services, be sure to contact Wilcox Energy. You can click here to contact us or call us at (860) 399-6218. Call now! Click the link to view our service area.

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