Which air conditioners can be used in winter: split-system ratings in April 2026

When asked whether it is possible to turn on the air conditioner in winter, we give a firm answer – yes, but certain conditions must be met. The equipment must be designed to operate at low temperatures, equipped with a winter heating kit, and a fan speed controller.

I propose a detailed examination of how air conditioners operate and the types of equipment that can and cannot be used in winter. We'll also touch on the issue of preparing a split system for winter use.

We'll also consider the consequences of turning on unprepared equipment. We'll identify the advantages and disadvantages of air conditioners, determine the relevance of purchasing one, and choose a model. At the end of the article, you'll find a rating of popular models and answers to frequently asked questions.

The operating principle of air conditioners, types of equipment

The general definition of "air conditioner" refers to climate control equipment equipped with a compressor, fan, condenser, evaporator, and other components. The system is charged with freon. These components can be located in one or more units, which determines the air conditioner's classification as one of three types:

Cooling and ventilation mode is the basic mode. The heating function is considered optional and is provided by the manufacturer for certain models.

Conventional air conditioners operate on an on/off switch. Once the set temperature is reached, the unit shuts off. Switching to and from standby mode results in increased energy consumption and wear on the compressor and fan.

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How an air conditioner works: types, design, and model ratings as of April 2026

Inverter air conditioners they don't turn off Once the set temperature parameters are reached, the compressor and fan operate at minimum capacity in standby mode. The absence of equipment starts and stops results in energy savings and longer service life for the components.

Regardless of the model, the operating principle of all air conditioners is the same for cooling:

1. The compressor compresses the freon gas and directs it under pressure from the evaporator to the condenser.
2. The freon, cooled by air, condenses in the condenser.
3. The refrigerant enters through the throttle body. The sudden drop in temperature and pressure causes the refrigerant to partially transform from a liquid to a gaseous state.
4. Cold freon enters the evaporator heat exchanger. A fan blows air through the unit. The cool air is released into the room. Some of the liquid freon, having absorbed the heat from the room air, boils. Transforming into a gas, the refrigerant enters the compressor for the next cycle.

In winter Cooling-only air conditioners cannot be used for heating. The room is not functioning properly. Heat can be obtained from the indoor unit at sub-zero temperatures outside, provided the heating mode is configured by the manufacturer.

The heating unit's operation is no different from its cooling counterpart. Only the purpose of the indoor and outdoor units changes. The outdoor unit removes cold air from the room, while the indoor unit supplies warm air into the building.

This process is made possible by a valve that changes the direction of freon flow. With each degree below zero, the compressor has difficulty delivering heat to the room because it can't absorb it from the refrigerant outside. When the temperature exceeds the manufacturer's recommended operating temperature, the compressor cannot be used.

When and which air conditioners can be turned on in winter

With the decrease in outdoor air temperature in winter you can turn on air conditioners for heating, capable of reversing the direction of refrigerant flow. The manufacturer uses the term "reversible" in its description of the equipment.

In northern regions, when severe frosts set in, a split-system air conditioner won't replace a full-fledged heating system. It's useful to turn on air conditioning equipment to comfortably warm a room during the off-season, when it's cold and damp outside.

It's easy to find out whether a split system or a monoblock unit can be used to heat a room in cold weather by reading the instructions, which indicate the lower thresholds.

1. Traditional split systems with linear control can be turned on when the outside temperature is not below -5^OC. Some models are designed for -7^OC, but the compressor constantly shuts down and overcools until it restarts. This increases the risk of equipment failure.
2. Inverter split systems can be turned on at -15 and -20^OC. Expensive models operate at a lower threshold of -30^OC. Frost is less dangerous for inverter air conditioners because the compressor is constantly running.
3. Monoblock units can be used for heating in any freezing temperature. The indoor equipment is not connected to the outside air.

Manufacturers produce winter kits that lower the air conditioning threshold. System and compressor functionality depends on the type of charge. Refrigerant brand R22 has low frost resistance.

At low outside temperatures, R32 or R410A refrigerants work well. However, refrigerants are not interchangeable. Each refrigerant is designed for a specific pressure. It is not possible to bleed the refrigerant from the system and refill it with a different type of gas.

Few people turn on their air conditioners for cooling in winter, but some enjoy the cooler weather during thaws. To avoid damaging the equipment, you can turn them on when the outside temperature is warm. not below +16^OWITH or as recommended by the manufacturer in the instructions. Failure to follow these operating instructions will result in the unit freezing and leaks.

Low temperatures in winter are typically maintained in industrial settings, such as cold storage rooms. Special equipment designed to operate with extended lower thresholds has been developed for these purposes. A household air conditioner can be upgraded. winter set.

Preparing a split system for winter operation

When asked whether it's safe to use an air conditioner in winter, I'd like to counter with a question: how prepared is the equipment for use in extreme conditions? Winter kits are available for use in freezing temperatures. The kit consists of three essential components:

A temperature sensor is often used as an additional kit. The control board for the units is either a single shared or individual one.

Water drains from the radiator when the air conditioner switches to defrost mode. Warming the sump prevents condensate from freezing. Oil accumulates in the crankcase. To reduce viscosity, heating is provided by a heating cable or plate encircling the housing.

To ensure easy starting of equipment in winter, it is recommended to warm up the compressor while it is idle. The only drawback of this method is increased energy consumption. To save energy, technicians set the compressor to an economy mode.

A pre-heated compressor while it's running consumes less electricity, but is practically useless. The frozen oil must be heated during idle periods.

The fan speed controller controls the intensity of heat exchange between the refrigerant and outside air. As airflow increases, heat transfer increases.

When a split system is set to heating mode in winter, the controller is practically useless. The fan speed is set to high by default by the manufacturer.

The regulator is needed when the air conditioner is switched to cooling mode when the outside temperature is below the recommended +16^OC. A fan rotating at high speed absorbs a lot of heat from the refrigerant. Icing begins in the indoor unit, and the condensate freezes. To prevent freezing, the controller reduces the fan speed.

How profitable is it to install a winter kit?

The cost-effectiveness of purchasing a winter kit is debatable. After installing the heaters and controller, the split system can be used in winter. The air conditioner doesn't generate heat, but rather absorbs it from the outside air. The efficiency of a split system operating in heating mode reaches 5-7, but only when the outside temperature is no lower than +7.^OWITH.

As the weather gets colder, the heat exchange between freon and air decreases. Air conditioner efficiency decreases. At -15°C^OEfficiency reaches a critical minimum of 1%. The ratio of consumed electricity to generated heat in kilowatts is 1:1. Similar figures are achieved by household heaters costing 2-3 times less than a split system.

The winter kit helps maintain efficiency at a useful level until frosts reach -15^OC. The cost of a high-quality kit with connection service ranges from 40 to 150% of the price of a split system.

Purchasing a kit to operate equipment in winter to heat an apartment or house instead of traditional heating in cold regions is unprofitable.

A winter kit can be beneficial when an air conditioner is needed to cool a specific room during the winter. The efficiency of a split system doesn't decrease until the temperature drops below freezing.

Consequences of turning on unprepared or unsuitable equipment for winter

Changing equipment operating conditions lead to failure of components. Extremely low outdoor temperatures increase the load on the compressor.

Let's highlight 3 serious dangers why you shouldn't turn on your air conditioner in winter without prior preparation:

1. Oil viscosity increases in cold temperatures. Starting a cold compressor with frozen lubricant places high loads, accelerating wear and tear on the motor windings. Thick oil fails to lubricate the compressor's moving parts. Metal parts form shavings, clogging the system. Installing a new compressor in place of the burned-out one will not solve the problem. The equipment will fail again, even with proper operation, when metal shavings escape from the system along with the oil.
2. In the external unit, the temperature of the cooled freon is -40^OC. Warming up the refrigerant increases the load on the compressor. Increased absorption of thermal energy occurs when the outside temperature is between +16 and 0^ODuring severe frosts, freon doesn't have time to reach its boiling point. Unheated liquid refrigerant enters the compressor, causing hydraulic shock. The damaged equipment requires costly replacement.
3. Turning on an unprepared compressor in winter can lead to icing of the outdoor unit. Frozen condensate forms a hard shell, preventing the outdoor unit's fan from blowing air over the heat exchanger. The automatic defrost function partially saves the unit, but water dripping from the warm radiator immediately freezes in the sump. The fan blades, trapped in thick ice, are unable to rotate, causing the unit to malfunction.

If an improperly winterized split system is turned on for cooling, an ice blockage will form inside the drain pipe. Condensate is diverted through the indoor unit into the room instead of being discharged outside. Water runs down the wall, damaging the finish. Condensate in the indoor unit can also freeze, resulting in equipment failure.

Do you need a winter air conditioner? Choosing the best option

When choosing a winter air conditioner, consider the cost and ease of use. Air conditioning units with heating capabilities have their advantages and disadvantages.

Advantages of purchasing a winter split system:

1. Efficiency is 2-3 times higher than that of household heaters.
2. The room is heated faster and more evenly by warm air flows forced by the fan.
3. Automated operation with convenient user modes allows you to create a constant comfortable microclimate in your home or apartment.
4. After using the system for heating in winter, a split system in cooling mode will provide relief from the heat in summer. It can be used in place of a regular fan or to dry out a damp room.
5. In southern regions, a split-system air conditioner with heating can replace a full-fledged heating system. Purchase and installation are cheaper and quicker for homeowners.
6. Equipment maintenance is performed by service technicians. The user is required to periodically remove dirt, cobwebs, and dust.

Wall-mounted unit placement for heating the living room

After reviewing the advantages, don't rush into buying a split system. Heating air conditioning systems have a number of disadvantages you should be aware of:

1. The efficiency of the air conditioner decreases with each degree decrease in outside temperature.
2. An indoor unit installed under the ceiling is unable to heat the floor evenly.
3. The price of a high-quality split-system with heating is comparable to and exceeds the cost of household heaters or a heating boiler.

Costs depend on the type of air conditioner installed and the location of operation. Inverter split systems are more cost-effective for heating rooms in warmer climates during the winter. In northern regions, using air conditioning equipment in winter is not always cheaper than traditional heating, or is useless.

Top Split Systems for Winter Use

Split-system air conditioners with heating and cooling capabilities can be used year-round. Air conditioners provide warmth with minimal energy consumption. The indoor unit does not reach dangerously high temperatures, preventing burns from touching the housing.

Visitors' ChoiceDantex RK-07SEG

This budget-friendly model will keep you warm in the winter, heating up any room in your apartment or home. It's energy-efficient and rated as Class A.

62

Panasonic CS-YW09MKD

The split system is designed for true connoisseurs of modern technology. Heating or cooling the room is achieved within a couple of minutes of switching on.

51

Aeronik ASI/ASO-07HS

This air conditioning system is designed for people who don't like to understand complex functions and controls. The split system consumes 760 W in heating mode and 780 W in cooling mode.

26

LG S09PT

This popular brand continues to impress customers with its reliable equipment. This split-system air conditioner with a wall-mounted indoor unit operates quietly.

23

Dantex RK-12SEG

This powerful air conditioner is designed for rooms up to 30 m². It has been rated as energy efficient class A.

17

Suggest your own option

The air conditioning system must be mounted out of reach of children. Using air conditioners in heating mode is recommended in apartments and private homes where active children live.

A general overview of the advantages doesn't fully address the issue of choosing an effective split system. Each air conditioner model has different technical parameters, which we'll detail in our ranking, along with a description of the pros and cons.

Dantex RK-07SEG

This budget model will keep you warm in the winter by heating up a room in your apartment or private home. In terms of energy consumption, the appliance is classified as class AThe unit is controlled remotely. Operating modes are displayed on the display. The manufacturer has included a timer, airflow adjustment, and other useful user features. Filters are installed to purify the air.

The split system's appearance rivals that of expensive equipment. The indoor unit blends seamlessly into any room's decor, regardless of its style. The housing doesn't show fingerprints after touching it. Dirt can be easily wiped off with a dry cloth.

Pros and cons:

The air conditioner offers a good balance of price and quality. The price of the equipment is listed on Yandex Market. 24,990 rubles.

Aeronik ASI/ASO-07HS

Air conditioning equipment is designed for people who don't like to understand complex functions and controls. A split system consumes: in heating mode – 760 W, cooling – 780 WThe difference is only 20 watts. The remote control has a minimum of buttons.

Switching modes is easy for both elderly and children. Once enabled, the unit quickly enters the preset operating mode. Safety is ensured by an automatic restart in the event of a malfunction.

Advantages and disadvantages:

The price range for split systems on Yandex Market varies from 22,400 to 26,068 rubles.

Panasonic CS-YW09MKD

This split system is designed for true fans of modern technology. Heating or cooling the room is achieved within minutes of activation. The user can customize the settings to suit their needs, including temperature and airflow direction.

The user can set the on and off times using a timer. Operation in both ventilation and dehumidification modes improves the microclimate in the living space. A filter is installed for air purification. At night, the indoor unit's quiet operation will not disturb sleep.

Advantages and disadvantages:

In retail outlets and online stores you can find split systems at an average price price 36,600 rubles.

LG S09PT

The popular brand continues to amaze consumers with its reliable equipment. This split system with a wall-mounted indoor unit operates quietly. The noise level does not exceed 27-34 dBHeating and cooling modes allow for a favorable indoor climate to be maintained year-round. Airflow is purified through a deodorizing filter.

Pros and cons:

The average price for a split system is set in retail outlets. 52,200 rubles.

Dantex RK-12SEG

A powerful air conditioner is designed for a room of up to 30 m²Energy consumption class A is assigned. Noise level does not exceed 32 dBA pre-filter, plasma filter, and fine air purifier are built in. An automatic self-diagnosis function is also included. The anti-allergy filter is highly appreciated by those sensitive to airborne allergens.

Advantages and disadvantages:

A split system is for sale on Yandex Market. for 46,750 rubles.

Answers to frequently asked questions

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