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Top Signs Your AC System Needs Maintenance: A Complete Guide

Air conditioning systems play a crucial role in ensuring comfort in our homes, offices and in new constructions. As such, maintaining them in top condition is vital for their efficiency and longevity. In this blog post, we will discuss the telltale signs that your AC system needs maintenance, stressing the importance of regular checkups for both residential and commercial HVAC systems.

As air conditioning systems work tirelessly throughout summers and in some cases, throughout the year, wear and tear is inevitable. That’s why it’s essential to have our professionals perform routine maintenance checks on your AC. This will not only help prevent sudden breakdowns but also improve the system’s efficiency, ultimately saving on energy costs.

Reduced Airflow and Cooling Efficiency

One of the most common signs that your AC system needs maintenance is when there’s a noticeable decline in its airflow and cooling efficiency. A clogged air filter, leaky or blocked ductwork, and a malfunctioning fan or motor are some of the most common causes of reduced airflow. It’s important to have our professionals inspect your AC system to determine the root cause of the problem, ensuring a prompt and effective solution.

Additionally, a drop in your AC system’s cooling capacity can be attributed to dirty coils, low refrigerant levels, or an inefficient thermostat. In any case, scheduling regular maintenance checks with our experienced technicians will help keep your system running smoothly.

Unusual Noises

Air conditioning systems are designed to operate quietly and efficiently. However, when you start hearing strange or loud noises, such as rattling, buzzing, or screeching, it’s time to call in the experts. These noises often indicate a specific issue with your AC system, such as:

1. Rattling or buzzing: Loose parts or debris caught in the unit.
2. Screeching: Worn or misaligned belts, a malfunctioning motor, or a lack of lubrication.
3. Hissing: Refrigerant leaks or pressure issues within the system.

Our professional technicians can quickly diagnose and resolve the issues causing these unusual noises, keeping your AC system in peak condition and minimizing disruptions to your comfort.

Increased Energy Bills

A sudden or steady increase in your energy bills without any significant changes in routine can also be a warning sign of AC maintenance issues. When an AC system is not running efficiently, it consumes more energy to maintain the desired temperature. Over time, this results in higher utility costs.

Several factors can be contributing to your AC system’s inefficiency, including:

1. Dirty or clogged air filters: Increased airflow resistance due to clogged filters can force your system to work harder, consuming more energy.
2. Malfunctioning thermostat: A faulty thermostat may not accurately read the ambient room temperature, causing your AC system to overwork.
3. Low refrigerant levels: An AC system operating with insufficient refrigerant levels will struggle to provide adequate cooling and consume excess energy in the process.

Scheduling regular maintenance with our expert technicians will not only keep your AC system performing optimally but also help you save on energy costs.

Foul Odors

An unpleasant odor coming from your AC system is not only an inconvenience but may also indicate a significant issue. Some common causes of foul odors from your AC unit include:

1. Bacterial or fungal growth: A wet and dark environment within your AC can foster the growth of harmful bacteria, fungi, and mold. When these organisms are present in your system, they produce a musty or sour smell and can negatively impact your indoor air quality.
2. Burnt wiring: If you notice a distinct burnt or smoky odor from your AC unit, it could be due to an electrical malfunction or burnt wires, posing a potential fire hazard.
3. Clogged ducts or filters: Accumulated dust, debris, or pests in your ductwork or filters can result in unpleasant odors circulating throughout your living or workspaces.

By calling upon our professionals, we can quickly identify and address the source of these unpleasant odors, ensuring the safety and comfort of your residential or commercial space.


Regular AC maintenance is essential for ensuring the optimal performance, efficiency, and longevity of your air conditioning system. When you spot telltale signs like reduced airflow, unusual noises, increased energy bills, or foul odors, it’s time to seek immediate assistance from our expert technicians at Vardell’s AC. We specialize in comprehensive AC maintenance, repair, and replacements, providing tailored solutions for both residential and commercial HVAC needs. Don’t wait for these warning signs to escalate into major issues – schedule an AC maintenance checkup with us today and enjoy the peace of mind that comes with a well-maintained system. Contact our AC contractor in Yuba City, CA now.