Nagakawa Inverter 4 HP NIT-C36R2U35 ceiling cassette air conditioner (3-phase)

The Nagakawa NIT-C36R2U35 is a 4 HP (3-phase) Inverter ceiling cassette air conditioner for spaces of roughly 55 - 60m², such as offices, meeting rooms, small lobbies or retail areas. With a capacity of 36,000 BTU, the Inverter keeps operation stable, and with air blown down from the ceiling the unit cools evenly and keeps the space airy during long hours of use.

Powerful enough for rooms of 55 - 60m²

In large rooms, the most important requirement is that the air conditioner has enough capacity to cool the entire space, especially when many people are present or the heat lasts for long periods. The Nagakawa NIT-C36R2U35 delivers 4 HP, or 36,000 BTU, which the manufacturer states is suitable for an area of 55 - 60m², equivalent to about 165 - 180m³. This makes it well suited to meeting rooms, offices, small lobbies or retail areas that need air conditioning for many hours every day.

A ceiling-cassette installation also keeps the room tidy because the unit takes no wall space. Cool air flows down from above, which suits spaces with many desks and chairs, lots of seated people, or interiors that need to stay uncluttered. In daily use, you will easily notice that the unit's cooling power for large rooms is far better than that of lower-capacity models.

That said, real-world performance still depends on the characteristics of each building. Rooms with large glass areas, direct sunlight, very high ceilings or doors that are constantly opened and closed will put a heavier load on the unit. Therefore, for places that absorb a lot of heat, you should calculate carefully before installation so that the 36,000 BTU is used properly.

Inverter saves electricity during long running hours

Ceiling cassette units for large rooms often have to run continuously for long periods, so energy saving deserves attention. The NIT-C36R2U35 features Inverter technology, which lets the unit adjust itself to keep the temperature stable instead of switching on and off repeatedly. As a result, the room rarely gets too cold and then warms up again, and people working for a long time feel more comfortable.

The unit's power consumption is 3.5 kWh, a figure that helps you estimate operating costs when cooling a room of 55 - 60m². In offices running all through working hours, meeting rooms used back-to-back, or reception areas needing an even temperature, the Inverter is even more valuable because the unit often runs for many hours.

To make the unit work more efficiently, set a moderate temperature, avoid changing it constantly, and remember to keep doors closed while it is running. In addition, the building must have a 3-phase power supply compatible with the outdoor unit. These factors significantly affect cooling stability and actual power consumption.

Fast cooling, air spreading evenly from the ceiling

When a room has just been opened after many hours closed, or many people suddenly walk in, the feeling of heat is usually obvious. The Strong mode on the NIT-C36R2U35 boosts cooling so that the room reaches the desired coolness sooner. This feature is especially useful at the start of a meeting, when the office opens in the morning, or when a reception area needs urgent cooling.

The louvers swing automatically up and down, and together with the ceiling-mounted position, cool air flows from above and spreads naturally throughout the room. In open-plan offices, long meeting rooms or small lobbies with many seats, this airflow style reduces the problem of one corner being cool while other spots remain hot.

Once the room is cool, the Inverter continues to keep the temperature stable. Even so, you should still set a moderate temperature and avoid placing seats directly under the air outlet for too long to prevent localized chill. Ceiling height, unit placement and how often doors are opened also affect how cool the room actually feels.

Coarse dust filter, cleaner indoor unit

Besides coolness, after some time using the unit you will also notice whether the air it blows is clean and comfortable. The NIT-C36R2U35 is equipped with a coarse dust filter that traps large dust particles floating in the room before the air is blown out again. Although it cannot replace a dedicated air purifier, this filter layer is still useful for everyday needs in offices, meeting rooms or work areas.

The unit also has Inside Cleaning and Auto Clean to clean the inside of the indoor unit. When the unit runs frequently, moisture and dust easily build up inside the indoor unit. These features treat the interior after each run, making the air more pleasant and reducing the effort needed to look after the unit.

Nevertheless, periodic cleaning and maintenance are still necessary, depending on the actual conditions of each building. The self-cleaning function only maintains basic cleanliness and cannot fully replace thorough cleaning, especially in dusty places or where the unit runs almost all week.

Quiet operation, many conveniences for offices

For meeting rooms or offices, an air conditioner needs to cool well but also run quietly, without annoying noise during long working hours. According to laboratory measurements, the NIT-C36R2U35 indoor unit has a noise level of 45 dB, while the outdoor unit is 56 dB. When the unit is installed to technical standards, this noise level suits places that demand concentration, such as work areas, meeting rooms or small service counters.

In addition, the unit offers a range of features that make daily use more convenient. Sleep Mode is suitable when you want to keep the room lightly cool for many hours, the dehumidifying function reduces dampness on humid days, and the on/off timer lets the unit run according to your work schedule. The indoor unit has an easy-to-read temperature display, while the self-diagnosis function and the ability to restart automatically when power returns make checking the unit's condition easier.

In practice, these features help in familiar situations such as turning the unit on before work starts, keeping a meeting room evenly cool throughout a session, or making the room drier on humid days. To keep the unit quiet and durable, pay attention to choosing the installation location, keeping the room closed, positioning the outdoor and indoor units sensibly, and carrying out periodic maintenance.

The Nagakawa Inverter 4 HP NIT-C36R2U35 is a suitable choice for offices, meeting rooms or small lobbies of about 55 - 60m² with a 3-phase power supply that need a ceiling cassette air conditioner with strong cooling, stable long-term operation thanks to the Inverter, fairly even air distribution, and a comfortable space every day.