What's Wrong with My Air Conditioner ?
Check Out Some or Most Commonly Asked HVAC Questions
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Why is my air conditioner making a loud buzzing or humming noise?
A loud buzzing or humming noise from your air conditioner could indicate several issues — loose parts, a failing motor, electrical problems, or a refrigerant leak. A buzzing sound from the outdoor unit often points to a malfunctioning contactor relay switch or condenser fan motor. If the noise comes from inside, it could be a blower motor issue or debris caught in the system.
Why does my air conditioner smell musty or like mildew when it runs?
A musty or mildew smell usually means moisture is trapped in the system, often due to a clogged drain line, dirty air filter, or mold growing on the evaporator coil or in the ductwork. When the system runs, it spreads that odor through the vents.
Why is my AC blowing warm air instead of cold?
If your AC is blowing warm air, it could be caused by low refrigerant levels, a dirty air filter blocking airflow, or issues with the compressor. It’s also possible the thermostat is set to “heat” or “fan” instead of “cool,” or that a breaker has tripped, cutting power to the outdoor unit. A frozen evaporator coil can also restrict cooling.
Why are some rooms in my home hotter than others?
The most common reasons include blocked or closed vents, dirty air filters, leaky or poorly designed ductwork, and uneven insulation. Rooms with more sun exposure or located farther from the HVAC unit may also struggle to stay cool. An unbalanced system or incorrect thermostat placement can make the problem worse.
Why is there water leaking from my indoor AC unit?
Water leaks are usually caused by a clogged or disconnected condensate drain line, a dirty air filter that restricts airflow, or a frozen evaporator coil melting. If the drain pan is cracked or overflowing, it can also lead to leaks around the unit.
How often should I replace my air filter?
Most standard air filters should be replaced every 1 to 3 months. However, if you have pets, allergies, or run your system often, monthly replacement is recommended to maintain airflow and air quality.
What happens if I don't replace my AC filter regularly?
A clogged AC filter can restrict airflow, making your system work harder and less efficiently. Over time, this can lead to poor cooling, higher energy bills, frozen coils, and even damage to your system. It can also reduce indoor air quality by allowing dust and allergens to circulate.
How do I know if my AC refrigerant is low or leaking?
Signs of low or leaking refrigerant include reduced cooling, longer run times, warm air from vents, ice on the refrigerant lines or evaporator coil, and hissing or bubbling noises. You may also notice higher energy bills as the system struggles to maintain the set temperature.
Why is my energy bill so high even though my AC runs normally?
A high energy bill can result from dirty air filters, poor insulation, leaking ductwork, or an aging, inefficient system. Even if your AC seems to run fine, it may be working harder than it should due to restricted airflow, thermostat issues, or improper system sizing for your home.
When should I call a professional for AC repair?
You should call for AC repair if your system is blowing warm air, making unusual noises, leaking water, short cycling, or not turning on at all. Other signs include weak airflow, strange odors, frozen coils, or a sudden spike in your energy bill. These issues often point to problems that need expert attention.
Do you offer after hours or emergency service?
Yes, Air Logic is available to take your call 24/7 for emergency HVAC service. Call us anytime and we’ll have a technician in touch with you as soon as possible to help.
