Skip to main content Why is My Air Conditioner So Loud? < Back to BlogYour email has been sent. Identifying Air Conditioner Noises and Smells Sometimes unpleasant smells and noises coming from an HVAC unit can indicate a problem with the system that could require maintenance orIf you’re experiencing air conditioner noise or if your air conditioner smells a bit funny, there may an issue inside your system. Components that could experience these problems include: • Compressor – While compressors are noisy by nature, if your compressor is making loud or unusual noises, it may be worn out. • Drive Shaft or Fan Blower Motor – If the drive motor is making loud noises, it may need some lubrication. All motors need to be lubricated at all time, otherwise it will wear out. Loud noises may be either• Fan Blade – If one of the fan blades break off, it can start rubbing against the house and cause unwanted noise. If the air from your system smells musty, it may be due to mold

and/or mildew buildup in your duct system. One way to get rid of this is to change the filter and clean the drip pan in your HVAC system. Clean using bleach or white vinegar to make sure the area is no longercar ac repair mt pleasant sc hospitable to mold growth.floor standing ac daikin Common furnace noises and their causesjunior's auto repair reno nv There are several furnace noises listed below, some of which could indicate a problem with the unit. If you’re concerned about a furnace noise contact your local American Standard dealer to schedule an HVAC check-up: • Screech – This could be a problem with your motor or fan• Chirp – Chirping sounds are fairly common with furnaces and usually the natural noise of the mechanisms.

Rattling noises typically happen when the system is cooling down and it not usually cause for alarm. • Boom – When the weather outside warms up or cools down, the ductwork in your house expands andIf this happens and your furnace smells like it’s burning, you might have a dirty burner in your furnace or a defective gas• Ping – This sound can also be caused by contracting • Hum – When the furnace burner lights, it may cause a humming• Whine – Whining or odd vibrating noise may indicate a problem with your furnace. • Crackle – Crackling noises may be the metal parts cooling down after the furnace shuts off. Clunk – Clunking or bumping sounds often means you have a cracked belt. The best way to determine whether your furnace is making an odd sound is to learn what it sounds like during normal operation, and note any changes in the type or volume of sound as the unit ages. you notice a significant change, call your local American Standard

dealer to schedule an inspection. Professional help for unwanted HVAC noises and smells If you’re experiencing unwanted noises or smells from either your hvac system, call a professional. While some noises are normal, others could indicate that something is wrong with your system. Standard Customer Care dealer can come to your home to see what may be wrong with your HVAC system and repair it, allowing your family to enjoy some comfort, peace and quiet. Why do Some AC Adapters and Power Supplies Make a Whining Noise? Most of the time our AC adapters and power supplies tend to be quiet, but what does it mean when one makes a whining noise? Should you be concerned? Today’s SuperUser Q&A post has the answers to a worried reader’s questions. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites. Photo courtesy of Bart Everson (Flickr).

SuperUser reader Rishat Muhametshin wants to know why some of his AC adapters and power supplies make a whining noise: I have many different AC adapters and power supplies for a variety of devices, ranging from small 5V/1A USB chargers to laptop power adapters and desktop PSUs. However, I often hear a whining noise from some of these power supplies. This happens most often when they are not connected to a device or otherwise in use, and stop making noise when I connect a device that is not fully charged. Why do some AC adapters and power supplies make this whining noise? Why do some not make this noise? Is there anything that I can do to suppress it? Why do some AC adapters and power supplies make a whining noise? SuperUser contributors DragonLord and Daniel R Hicks have the answer for us. Most power conversion devices contains coils, such as transformers or inductors. These components use electromagnetism to convert AC main power to low-voltage DC power. The varying magnetic fields generated by these components can cause them to physically vibrate at high frequency, resulting in a high-pitched noise.

Most modern AC adapters are switched-mode power supplies. The internal switching frequency of an SMPS is typically low when unloaded and increases with a load (up to a certain point depending on the design). The no-load frequency is often low enough to be within the human hearing range. In addition, in low or no-load situations the PWM (Pulse Width Modulation) used to regulate voltage at the inverter stage will be at a low duty cycle and create a “spikey” output profile which is more prone to causing vibration in coils, and the transformer itself will tend to vibrate as well. Together, these can lead to audible noise especially in cheaper units which fail to suppress this noise. Under a load, a properly functioning SMPS should operate at a frequency well above the human hearing range, typically 50 KHz or higher (although some older designs operate at 33 kHz). However, the same noise can occur under a load with a poorly designed or defective power supply as the coils may vibrate under electrical stress at a sub-harmonic frequency.

This is why you sometimes see a “glue” of sorts on coils inside electronic devices. The glue helps reduce the vibration and noise the coils generate during normal operation. Of course, this means that a user can apply glue onto coils using a glue gun to suppress coil whine—and yes, people have done this successfully with PC motherboards, graphics cards, and power supplies. However, you generally cannot do this easily on small wall chargers of the sort you mentioned without risking damage to the charger or exposure to potentially dangerous voltages. In conclusion, a whining noise is not necessarily a sign of trouble in cheaper wall chargers when they are unloaded. However, a computer PSU or laptop charger that generates coil noise, especially when under a load, may be defective and you may want to consider replacing it. More information on coil noise can be found in this Wikipedia article. Followed by the answer from Daniel R Hicks: A coil of copper wire without any “core” metal plates can be made to whine.