The refrigerator is the only household appliance that works around the clock, and its noise can become a real problem, especially in small apartments or studios. If you notice that the unit has begun to hum louder than usual, or simply want to check compliance with the declared characteristics before purchasing, it is important to know how to correctly measure the noise level.
Manufacturers indicate the average noise level in decibels (dB) in the technical data sheet, but actual values may differ due to operating conditions, wear of parts or improper installation. In this article, we will figure out how to independently measure the noise of a refrigerator using improvised means and professional equipment, as well as what to do if the indicators exceed the norm.
Why the refrigerator is noisy: the main sources of sound
Before measuring the noise, it is worth understanding exactly what elements of the refrigerator create it. This will help not only more accurately interpret the measurement results, but also identify potential malfunctions.
Main sources of noise:
- 🔄 Compressor —the “heart” of the refrigerator, which pumps the refrigerant. Modern inverter models are quieter, but even they produce a low-frequency hum (20–50 dB). Old linear compressors can make noise up to 60 dB.
- 🌀 Fans (in models with No Frost) - distributes cold air among the chambers. Their noise is usually high-frequency (whistle or buzz) and reaches 35–45 dB.
- 💧 Refrigerant circulation - gurgling or hissing in the system tubes. The sound is normal, but if it becomes louder, there may be a freon leak.
- ⚙️ Casing vibrations - occurs due to improper installation (uneven floor, contact with the wall) or wear on the compressor shock absorbers.
If the refrigerator makes noise uncharacteristic sounds (grinding, knocking, sharp buzzing), this may indicate a breakdown. In such cases, it is better to combine noise measurement with diagnostics.
Noise standards for refrigerators: what is considered quiet and what is loud
According to European standards (EN 60704-1) and GOST 16317-87, the permissible noise level of household refrigerators in residential premises should not exceed 55 dB. However, modern models usually operate in the range 35–45 dB - this is comparable to a quiet conversation or background noise in the office.
The table below shows the approximate standards for different types of refrigerators:
| Refrigerator type | Noise level (dB) | Model example |
|---|---|---|
| Inverter (premium class) | 32–38 | LG DoorCooling+, Samsung RB7000 |
| No Frost (with fan) | 38–45 | Bosch KAN92VI30, Indesit ITF 118 |
| Drip (without fan) | 35–42 | ATLANT XM 4021-000, Biryusa 140 |
| Old models (before 2010) | 45–55 | Stinol 102, Zanussi ZRA 32100 |
| Industrial/commercial | 55–70 | Lieberr LPR 1400, Polar G-1200 |
⚠️ Attention: Noise level may temporarily increase to 50–55 dB in the following cases:
- 🔥 When first turned on (charging the system with refrigerant).
- ❄️ During intense freezing (function
Super Freeze). - 🌡️ In a hot room (the compressor operates at maximum power).
Method 1: Checking the technical specifications in the documentation
The easiest way to find out the noise level is to look at it in refrigerator passport or on the sticker on the back (usually next to the energy consumption). Manufacturers are required to indicate this parameter in decibels (dB or dB). data-i="99">refrigerator passport Samsung RB37A5200SA indicated 39 dB, and on ATLANT MXM 2835-90 - 42 dB.
Where to look for information:
- 📄 Operating instructions (section "Technical specifications").
- 🏷️ Label on the back wall (next to the serial number).
- 🌐 Official website manufacturer (in the product card).
- 🛒 Receipt or warranty card (sometimes they duplicate key parameters).
⚠️ Attention: The noise level indicated in the documentation is measured in laboratory conditions (at a temperature of +25°C, an empty refrigerator and an ideal installation). In reality, it may differ by ±5 dB.
What to do if documentation is lost?
If you do not have a passport, find the model of the refrigerator (usually indicated on a sticker inside the chamber or on the back) and enter its name in the search engine with the request "model name technical specifications site:manufacturer_name.ru". For example: "Indesit DF 5200 S technical specifications site:indesit.ru".
Method 2: Using mobile sound meter applications
If you want to measure the noise of the refrigerator right now, the easiest way is to use sound meter application for a smartphone. The accuracy of such programs is lower than professional devices (accuracy ±3–5 dB), but for everyday use this is enough.
Best free applications:
- 📱 Decibel X (iOS/Android) - shows the current and average noise level, keeps a graph of changes.
- 📊 Sound Meter (Android) - simple interface, calibrated under the device's microphone.
- 🎵 NIOSH SLM (iOS/Android) - developed by the US National Institute of Safety, supports frequency analysis.
How to correctly measure the noise of a refrigerator with a phone:
- Make sure that the room is quiet (turn off the TV, air conditioner, fan).
- Place the phone at a distance 1 meter from the refrigerator (at the level of the middle of the case).
- Launch the application and wait until the readings stabilize (usually 30-60 seconds).
- Record average value (not peak!).
Remove extraneous sound sources|
Close windows and doors|
Put the phone on a stable surface|
Measure the noise at a distance of 1 m from the refrigerator|
Repeat the measurement 2-3 times for accuracy-->
⚠️ Attention: Smartphone microphones do not pick up low frequencies well (namely, they predominate in the hum of the compressor). For more accurate data, use an external microphone or a professional one. sound level meter.
Method 3: Professional sound level meter - accuracy up to 0.1 dB
If you need maximum accurate data (for example, for examination or litigation with neighbors), you will need a certified one sound level meter (for example, Testo 816-1, BENETECH GM1356 or Extech 407730). Such devices cost from 5 to 50 thousand rubles, but they can be rented or rented in laboratories.
How to use a sound level meter:
- Install the device on a tripod or flat surface at a distance 1 m from the refrigerator.
- Select mode
A-weighting(dBA) - it simulates the perception of sound by the human ear. - Activate the function
Slow(slow averaging) to smooth out peak values. - Record readings over time 10–15 minutes (the compressor operates in cycles).
Professional sound level meters also allow:
- 📈 Build graphs of noise changes over time.
- 🔍 Analyze frequency spectrum (identify the source of the hum - a compressor or fan).
- 📋 Save data for reports.
Method 4: Comparison with household sounds (subjective method)
If you don’t have a telephone or a sound level meter at hand, you can roughly estimate the noise level of the refrigerator by comparing it with other household sounds. This method is subjective, but it will help you understand how much the hum goes beyond the normal limits.
Approximate scale:
- 🍃 20–30 dB — rustling of leaves, ticking of a clock. (Ideally quiet refrigerator - found rarely.)
- 🗣️ 30–40 dB — quiet conversation, library. (The norm for modern models.)
- 📻 40–50 dB — working TV at medium volume. (Acceptable, but may interfere with sleep.)
- 🚗 50–60 dB — the hum of a car outside the window. (Too loud for the refrigerator.)
- 🔨 60+ dB — work drill, vacuum cleaner. (Critical level - requires repair.)
For a more objective assessment:
- Stand at a distance of 1–1.5 m from the refrigerator.
- Close your eyes and listen (to eliminate visual cues).
- Compare the hum with the sounds from the list above.
⚠️ Attention: The human ear is less sensitive to low frequencies (like a compressor) during the day than at night. If the refrigerator seems louder in the evenings, this is not self-deception - this is how our physiology works.
Method 5: Diagnosis of malfunctions by the nature of the noise
If the refrigerator is noisier than usual, the reason may lie in breakdown. Experienced technicians determine the malfunction even by the type of sound. Here are the most common “symptoms”:
| Nature of noise | Possible cause | What to do |
|---|---|---|
| Loud buzzing with vibration | Wear of compressor shock absorbers | Replace rubber gaskets or adjust fastening |
| Whistling or howling | Clogged capillary tube or freon leak | Call a technician to diagnose the system |
| Clicks and crackling | Problems with the compressor start relay | Check the contacts or replace the relay |
| Gurgling and bubbling | Moisture in the system or excess refrigerant | Recharge the system (a specialist is required) |
| Sharp hum when turned on | Compressor overload (high voltage in the network) | Install voltage stabilizer |
If the refrigerator suddenly begins to make noise, check:
- 🔌 Network voltage (should be 220-230 V).
- 🧊 Room temperature (at +30°C and above the compressor wears out).
- 📦 Closing the door (if the seal is worn out, the motor runs without stopping).
How to check the door seal?
Insert a sheet of paper between the body and the seal. If it falls out or is easily pulled out, it's time to replace the rubber band.
How to reduce the noise of a refrigerator: 7 practical tips
If measurements show that the refrigerator makes noise within normal limits, but the sound is still annoying, try these methods:
- Level the refrigerator. Uneven installation leads to vibrations. Use adjustable feet or place rubber pads under them.
- Move the refrigerator away from the wall. The minimum distance is 5 cm (for ventilation and dampening vibrations).
- Check the contents of the chambers. Overloaded shelves or touching the back wall of products may increase the hum.
- Install soundproofing mat. Special pads made of foam polyethylene (for example, Silmar) reduce vibrations by 5-10 dB.
- Move the refrigerator to a non-residential area. If the dimensions of the kitchen allow, place it in the pantry or hallway.
- Set the operating mode. Some models (for example, Liebherr) have a function
Night Mode, which reduces noise at night. - Replace the old refrigerator with an inverter one. Modern models (for example, Panasonic NR-BN30AW1) operate almost silently (32 dB).
⚠️ Attention: Do not place the refrigerator next to heat sources (radiator, stove, oven). This will force the compressor to work at its maximum capacity, increasing noise and wear.
FAQ: Frequently asked questions about the noise of refrigerators
🔊 Why is a new refrigerator noisier than the old one?
Modern refrigerators are often equipped with a system No Frost c fans, which add noise (although the compressor may be quieter). Also, new models use a more environmentally friendly, but less efficient refrigerant (for example, R600a instead of R134a), which causes the compressor to run longer. Check if the fast freezing mode is turned on (Super Cool).
📏 At what distance should you measure noise?
The standard distance for measurements is 1 meter from the front wall of the refrigerator at the height of the middle of the case (approximately 1-1.2 m from the floor). This imitates the position of the ear of a person standing nearby. If measure closer, the readings will be inflated due to vibrations of the housing.
🛠️ Is it possible to repair a noisy compressor?
A compressor is a non-repairable part If it makes noise due to wear (for example, play). piston), it can only be replaced. However, often the problem lies not in the compressor itself, but in shock absorbers (rubber gaskets), which dampen vibrations. Replacing them is cheaper (from 500 rubles) and can completely eliminate the hum.
🌙 Why a refrigerator makes noise louder at night than during the day?
This is due to two factors:
- Physiology of hearing: At night in silence, the human ear becomes more sensitive to low frequencies (the compressor works on them).
- Operating mode: In some refrigerators (for example, Samsung Digital Inverter) the compressor automatically switches to intensive cooling mode at night when the room temperature drops.
To check the second point, disable the function Eco Mode or Night Cooling in the settings (if any).
📱 Which application for measuring noise is the most accurate?
The most accurate among the free ones is NIOSH SLM (developed by the US National Institute of Safety) It has been calibrated to the ANSI S1.4 standard and shows an error of no more than ±2 dB on modern smartphones (iPhone 8). and newer, Samsung Galaxy S7 and newer). It is also suitable for Android Decibel X, but it must first be calibrated by reference sound (for example, silence in the room).