Silence in the house is not just the absence of sounds, but basic comfort, which is often disturbed by the hum of operating equipment. When you choose a new unit for the kitchen, the question of whether it actually works becomes one of the most important, especially if the kitchen is combined with the living room or is located next to the bedroom. Manufacturers often use marketing ploys by calling their models “quiet,” but the numbers on the sticker may indicate different levels of acoustic pressure. silent refrigerators, how many decibels published in reality, becomes one of the most important, especially if the kitchen is combined with the living room or is located next to the bedroom. Manufacturers often use marketing ploys by calling their models “quiet,” but the numbers on the sticker may indicate different levels of acoustic pressure.
Understanding the decibel scale is necessary in order not to be disappointed in the purchase after installation. Many consumers don't realize that even a difference of 2-3 dB can be noticeable at night when the background noise of the city subsides. In this article we will look at real indicators, the dependence of the sound level on the type of compressor and ways to minimize the hum of existing equipment.
It is important to consider that modern energy efficiency standards often go hand in hand with low noise levels, but not always. Inverter technologies has radically changed the market, allowing the creation of units that operate almost silently, however, old models with conventional motors are still found on sale and can become a source serious discomfort.
What is considered normal: deciphering noise indicators
First, you need to understand the physical quantities by which sound is measured. A decibel (dB) is a logarithmic unit, meaning that just a 10 dB increase in sound level is perceived by the human ear as twice the volume. Therefore, when you see a spread from 35 to 45 dB, these are not just numbers, but a significant difference in sensations.
According to European standards and GOSTs, all household refrigerators are divided into several classes according to the level of noise emitted. Models whose value exceeds 45 dB are considered loud - such a sound is already clearly audible in the next room. The normal level for modern technology is considered to be the range from 39 to 42 dB, which is comparable to a quiet whisper.
However, silent refrigerators is a separate premium class category. Their readings are often in the range of 34–36 dB. To understand the scale, compare: 30 dB is the rustling of leaves, and 40 dB is a quiet conversation. If you are looking for ideal silence, you need to focus on the lower end of the scale.
⚠️ Attention: The noise level declared by the manufacturer is often measured in an anechoic chamber under ideal conditions. In a real kitchen, where sound is reflected from walls and tiles, the actual level can be 2-4 dB higher than the passport data.
When choosing, you should pay attention not only to the average value, but also to peak loads. Some models may run quietly most of the time, but make brief loud noises when starting up or defrosting. That is why inverter systems have the most stable performance, which do not have sharp starting currents and mechanical relay clicks.
Types of compressors and their effect on acoustics
The main source of noise in any refrigerator is the compressor. It is its design and operating principle that determines whether your kitchen will be filled with a smooth hum or an irritating rattle. Two main types of motors dominate the market today, and their acoustic properties are radically different.
Conventional linear (piston) compressors operate on a start-stop principle. They turn on at full power, quickly cool the chamber and turn off. At the moment of switching on and off, mechanical clicks and jerks occur, which create a characteristic low-frequency hum. Such models typically emit 40 to 45 dB or more.
Inverter compressors, on the other hand, operate continuously, but at variable speeds. They do not need to start abruptly, so they are devoid of starting noise. Digital Inverter technology or Eco Silence allows you to maintain the temperature by smoothly changing engine speed. This ensures a noise level within 34–38 dB, which makes them practically inaudible.
- 🔊 Linear compressor: characterized by intermittent hum and clicks, level 40–48 dB.
- 🤫 Inverter motor: smooth, barely noticeable background, level 34–39 dB.
- ⚙️ Combined systems: can combine different types of motors for the freezer and refrigerator compartments.
It is also worth mentioning absorption refrigerators, which do not have moving mechanical parts at all in the classical sense. The refrigerant circulates in them due to heating. They are absolutely silent, but consume more energy and are less common in the household segment. For an ordinary apartment, the best choice remains a high-quality inverter unit.
Comparative table of noise levels of different models
To make it easier for you to navigate the characteristics of different brands, we have prepared a summary table. Here are the average indicators for different classes of equipment. Remember that the volume of the chamber also plays a role: the larger the refrigerator, the more powerful the compressor is usually required, which can affect the volume.
| Equipment category | Compressor type | Average noise level (dB) | Aural perception |
|---|---|---|---|
| Budget models (No Frost) | Linear | 42–46 dB | Clearly audible in silence |
| Middle class (Mix) | Inverter | 38–40 dB | Quiet background hum |
| Premium segment | Inverter + | 34–36 dB | Barely distinguishable |
| Built-in appliances | Various | 35–39 dB | Depends on furniture |
The table shows that the transition from the budget segment to the middle class gives a tangible gain in comfort. However, it is worth considering that built-in appliances, even with a conventional motor, often sound quieter due to the soundproofing properties of the kitchen unit. Furniture acts as an additional acoustic screen, absorbing some of the vibrations.
When comparing models in a store, pay attention not only to the numbers, but also to the nature of the sound, if it is possible to include a demo sample. Some cheap Chinese brands may claim 38 dB, but at the same time produce a high-frequency whistle, which is less tolerated than the low hum of an expensive one Liebherr or Bosch with a figure of 40 dB.
Factors that increase noise during operation
Even if you bought a quiet refrigerator, over time it may begin to make more noise. This does not always mean failure. Often the reason lies in improper installation or changes in operating conditions. Understanding these factors will help you maintain acoustic comfort for many years.
The first and most common enemy of silence is vibration. If the refrigerator is not level, the compressor begins to resonate with the floor, transmitting the hum to the entire structure of the building. This is especially true for wooden floors in old houses. In such cases, even 35 dB can turn into intrusive bass.
The second factor is proximity to walls and furniture. For normal operation, the cooling system needs air exchange. If the gap between the back wall and the furniture is less than 5 cm, the air flow becomes turbulent, creating additional whistling and noise. In addition, overheating of the compressor due to poor ventilation causes it to operate at higher speeds.
- 🏠 Uneven floor: causes casing rattling and increased vibration.
- 🌬️ Condenser clogged with dust: causes the motor to work harder and louder.
- ❄️ Ice in the No Frost system: disrupts air circulation, increasing the load on the fan.
⚠️ Attention: If the noise level increases sharply and extraneous sounds appear (grinding, knocking, gurgling), this may indicate a malfunction of the fan or wear of the compressor bearings. In this case, simple adjustment will not help - diagnostics are required.
It is also worth mentioning the age of the equipment. Over time, the lubricant in the fan bearings dries out, and the shock absorber mounts dry out. An old, but working refrigerator may make more noise than a new budget analogue simply due to the natural wear and tear of mechanical parts.
How to reduce the noise level: practical tips
If your refrigerator is already in the kitchen and has begun to irritate with noise, do not rush to change it. There are a number of effective measures that will reduce the level of discomfort without interfering with complex electronics. Often the problem is solved by simply adjusting the position of the body.
Start by adjusting the support legs. Make sure that the refrigerator is strictly horizontal and also has a slight tilt back (to close the doors tightly). By twisting the legs, you can find a position in which resonance with the floor is minimal. This is especially important for models with linear compressor.
The second step is the organization of gaps. Move the appliances away from the wall at least 10 cm. If the kitchen design allows, you can stick a thin layer of vibration-isolating material, for example, bitoplast, on the back panel of the refrigerator (from the motor side). This will reduce the vibration of the metal case.
☑️ Checking noise sources
The third tip concerns the internal space. Check if bottles or cans on shelves are vibrating. Sometimes the rattling noise does not come from the motor, but from the glass container, which resonates from the operation of the fan. Using silicone mats on shelves can also help dampen unnecessary sounds.
Features of choosing a quiet refrigerator for a studio
Owners studio apartments, where the kitchen and bedroom are combined into one space, the choice of equipment should be approached with special care. The rule “as long as it freezes” does not apply here. The noise of the refrigerator in the studio becomes background noise for sleep and rest, so the requirements for it are equal to the requirements for sleeping equipment.
First of all, look for models labeled “Silence”, “Quiet” or similar. Manufacturers specifically highlight such lines. As a rule, these are two-compressor systems or advanced inverters. Pay attention to the brand LG with their technology Linear Inverter or Siemens with the system quietMark.
An important parameter for the studio is also the absence of R600a freon in large volumes, which can create a characteristic gurgle when flowing. Although it is impossible to completely eliminate the sound of the refrigerant flow, in high-quality models it is muffled by the sound insulation of the engine compartment.
Do not forget about the dimensions. In a small studio, the refrigerator is often placed close to the sofa. In this case, even 38 dB can interfere. Consider moving the refrigerator into a hallway or niche, if the layout allows, or choose a narrow built-in model that will be hidden behind the cabinet facade.
Why are two-compressor systems quieter?
Two-compressor refrigerators are often quieter because each motor is responsible only for its own chamber and turns on less often. While one is working, the other is resting, which reduces the overall load on the network and the level of background noise in the room.
FAQ: Frequently asked questions about the noise of refrigerators
Is it normal for a refrigerator to make the sound of running water?
Yes, this is absolutely normal. The sound of refrigerant (freon) flowing through the system pipes is often described as gurgling or gurgling. This is especially audible in models with the system No Frost and at the moment immediately after the compressor is turned off, when the pressure in the system is equalized.
Why does a new refrigerator make more noise than the old one?
Modern models often use more powerful fans for the No Frost system and environmentally friendly refrigerants, which can create a specific high-frequency sound. In addition, old refrigerators could simply become deaf over time, and the new one is perceived in contrast. Give the equipment 2-3 weeks to “break in.”
Is it possible to make a refrigerator completely silent with your own hands?
Completely - no, since the physics of the cooling process requires the operation of a compressor. However, you can reduce the noise by installing the unit on a vibration-isolating platform, checking the tightness of all fasteners and making sure that it does not touch walls or furniture.
What noise level is considered critical for a bedroom?
For a bedroom adjacent to the kitchen, the critical threshold is 40 dB. Anything higher may make it difficult for sensitive people to fall asleep. The optimal choice for such conditions are models with a noise level of up to 36–37 dB.
Does the amount of food in the refrigerator affect the noise level?
Indirectly - yes. A fully loaded refrigerator stays cold longer, so the compressor turns on less often. However, if food is placed close to the back wall or obscures the ventilation openings, this can increase the noise of the fan and create air turbulence.