Ceiling-Mounted Air Conditioner with Humidity Control | Concealed Constant Temperature & Humidity Unit

Why a Ceiling-Mounted Air Conditioner with Humidity Control

A normal air conditioner controls temperature and only removes moisture as a side effect; it cannot hold a humidity setpoint or raise humidity when the air is too dry. A ceiling-mounted air conditioner with humidity control — a concealed constant temperature and humidity unit — holds both temperature and humidity to a setpoint at once, from above the ceiling, freeing all floor space. Four characteristics define it. (Prefer a floor cabinet, or need higher single-unit capacity? See our floor-standing air conditioner with humidity control.)

Independent Temperature AND Humidity Control

A comfort air conditioner removes some moisture incidentally while cooling — it cannot raise humidity or hold RH to a setpoint. A ceiling-mounted air conditioner with humidity control holds a target RH independently of temperature, integrating dehumidification, humidification, cooling, and heating in one concealed unit. It dehumidifies when the room is too humid and humidifies when too dry, so both temperature and humidity stay on spec across seasons and loads — the defining behavior of a constant temperature and humidity unit.

Ceiling-Mounted, Concealed, and Space-Saving

The ceiling-mounted (concealed) format is the space saver. The unit installs above a suspended ceiling or in a service void, freeing every square meter of floor for equipment, benches, or merchandise, and stays hidden for clean rooms and customer-facing spaces. This is why ceiling-mounted precision air conditioners are the standard choice for computer rooms, network closets, labs, and retail where floor space and aesthetics both matter.

Ducted Overhead Air Distribution

A concealed ceiling unit distributes conditioned air through ducting and ceiling grilles, delivering uniform temperature and humidity across the room from above rather than from a single floor cabinet. Ducted overhead distribution suits long or open-plan rooms and lets one unit serve multiple grilles or zones, washing the space evenly instead of creating a hot or dry spot near the cabinet.

Precision Tolerance (±1°C / ±5% RH)

Precision is the point. These units hold tight tolerances — typically ±1°C on temperature and ±5% RH on humidity — across a controllable range such as 18–30°C and 40–70% RH. That stability is what electronics production, laboratories, metrology and calibration rooms, server rooms, and sensitive process environments require, and what a comfort air conditioner cannot deliver.

Our Ceiling-Mounted Constant Temperature and Humidity Unit Range

Built on SHISHUO's ceiling-ducted dehumidification (GDH-CE) platform together with our humidification and refrigeration technology, these concealed units integrate all four functions overhead. They are configured by room size, heat load, and target conditions; the four configurations below show the typical range. (Specific model codes are assigned per project specification.)

Series

Ceiling Ducted Constant Temperature and Humidity Unit (DXHW-3 to DXHW-70)

Capacity & Application

Cooling capacity: 3–68 kW. Concealed ceiling-ducted unit integrating cooling, heating, dehumidifying, and humidifying with zero floor footprint. Touch control interface and industrial-grade component protection. Models: DXHW-3 to DXHW-70.

Series

Precision Air Conditioner & Constant Temperature and Humidity Unit (DXHW Series)

Capacity & Application

Cooling capacity: 3–68 kW. Holds ±1°C and ±5% RH for 24/7 commercial and industrial facilities. Powder-coated corrosion-resistant shell. Models: DXHW-3 to DXHW-70.

Series

Industrial Precision Air Conditioner for Data Center and Server Room (HSJ-03 to HSJ-60)

Capacity & Application

Humidification: 2–15 kg/h (220V/380V). Split precision air conditioner with heating, cooling, and dehumidification; PLC touchscreen control; rated for continuous data center and server room duty. Models: HSJ-03 to HSJ-60.

Series

Industrial Humidifier and Dehumidifier Combo Unit (DS-03HS to DS-20HS, 9 Capacity Tiers)

Capacity & Application

Humidification: 96–480 L/day; dehumidification: 72–300 L/day (220V/380V). Industrial 2-in-1 combo unit with air purification and ion sterilization, microcomputer LCD control, for server rooms, cleanrooms, and laboratories. Models: DS-03HS to DS-20HS.

In addition to ceiling-mounted constant temperature and humidity units, we also manufacture:

• GDH and GDH-CE Dehumidifiers (38–1,440 L/day) plus ROD Rotary Desiccant — standalone moisture removal

• UH-DS Ultrasonic Humidifiers (2–30 kg/h) — standalone humidification

• SSPAC Portable Air Conditioners (2,700–5,000 W) — directional spot cooling

Applications We Serve

View All Applications →

Computer Rooms, Server Rooms, and Network Closets

Computer rooms, server rooms, and network/IDF-MDF closets are where ceiling-mounted precision units excel — they hold tight temperature and humidity to protect equipment while taking zero floor space, leaving the room entirely for racks. Concealed overhead installation also keeps the conditioned air off the operating personnel and the cabling.

Electronics and Semiconductor Production

Electronics and semiconductor lines need stable temperature and 40–60% RH simultaneously — too dry risks ESD, too humid risks corrosion. A concealed ceiling unit holds both to ±1°C / ±5% RH and distributes evenly from above, without a floor cabinet interrupting the production layout.

Laboratories and Testing Rooms

Laboratories and testing rooms need documented, stable conditions for reproducible results. A ceiling-concealed unit holds the target band continuously with real-time display and optional logging, while keeping bench and floor space clear for instruments.

Metrology and Calibration Rooms

Metrology and calibration rooms hold reference conditions (commonly 20°C / 50% RH) within tight tolerance because measurement accuracy depends on it. Overhead ducted distribution gives the uniform, draft-controlled field these rooms require, at ±1°C / ±5% RH.

Pharmaceutical and Cleanroom Environments

Pharmaceutical and cleanroom environments pair particulate control with precise temperature and humidity, and concealed ceiling units integrate cleanly with cleanroom ceilings, filtration, and ducting. Four-function control holds the defined window year-round.

Telecom and Equipment Rooms

Telecom and equipment rooms generate concentrated heat and need protected, stable conditions in often compact footprints. A ceiling-mounted precision unit conditions the room from above without consuming the limited floor area the equipment needs.

Archive, Museum, and Precision Storage

Archives, museums, and precision storage need stable conditions (often around 20°C / 50% RH) with no swings that crack, warp, or mold sensitive materials — delivered discreetly. Concealed ceiling installation preserves the room's appearance while holding tight tolerance.

Retail, Office, and Light Commercial Precision Spaces

Retail, office, and light-commercial precision spaces want controlled temperature and humidity without a visible floor cabinet. The concealed ceiling unit holds conditions while staying hidden above the ceiling, preserving the customer-facing aesthetic.

Frequently Asked Questions

What is a ceiling-mounted air conditioner with humidity control?

It is a concealed, ceiling-installed air conditioner that holds both temperature and humidity to a setpoint at the same time — a constant temperature and humidity unit mounted above the ceiling. Unlike a comfort AC, which only removes moisture incidentally, it dehumidifies when too humid and humidifies when too dry while cooling or heating to hold temperature, distributing conditioned air through ducting and ceiling grilles to a tight tolerance, typically ±1°C and ±5% RH.

Ceiling-mounted or floor-standing — which should I choose?

Choose ceiling-mounted when floor space is at a premium or the unit must stay hidden — server/computer rooms, cleanrooms, labs, retail, and offices. Choose floor-standing when you need higher single-unit capacity, simpler service access, or there is no ceiling void to conceal the unit. Both hold the same precision; the difference is form factor and installation. See our floor-standing air conditioner with humidity control for that option.

Can it both add and remove humidity?

Yes — that is the defining feature. The unit dehumidifies when humidity is above the setpoint and humidifies when below, holding the target RH in both directions across seasons, under unified control with the temperature. A standard AC and a standalone dehumidifier can only remove moisture; this unit also adds it.

What temperature and humidity tolerance can it hold?

Standard configurations hold approximately ±1°C on temperature and ±5% RH on humidity, across a controllable range of roughly 18–30°C and 40–70% RH. Tighter tolerances are available on specification — tell us the required band and stability at the inquiry stage and we configure the control and component staging to match.

How is condensate drained from a ceiling-mounted unit?

Because a ceiling unit usually cannot drain by gravity, it uses a built-in condensate drain pump that lifts condensate up and over to the building drain line. At installation, provide a condensate route within the pump's lift capacity and a continuous water-supply connection for the humidification stage. We confirm the drain and water-supply requirements for the chosen model at the inquiry stage.

What applications suit a ceiling-mounted precision unit?

Ceiling-mounted units suit any space where floor area is scarce or the unit must stay concealed: computer/server rooms and network closets, electronics and semiconductor rooms, laboratories and metrology rooms, cleanrooms and pharma spaces, telecom/equipment rooms, archives and museums, and precision retail or office spaces. All need both temperature and humidity held tightly, delivered overhead.

Do you make custom and OEM units?

Yes. SHISHUO is a manufacturer and configures each unit to the project — capacity staging, concealed ceiling or split configuration, low-profile option, control and logging, and tolerance band. We support OEM (your branding) and ODM (modified hardware) for cleanroom and lab contractors, facility builders, and distributors. Process follows our catalog 6-step flow from requirement analysis through testing and shipping.

What voltage are the units, and do you ship internationally?

Standard units run on 220V/50Hz and 380V three-phase; 110V/60Hz and 240V/50Hz are available on ODM specification. We are an export manufacturer and ship internationally — contact us with your room conditions, target temperature and humidity band, ceiling void depth, and destination market for a configured recommendation, certificates where applicable, and a quotation.

Ceiling-Mounted Constant Temperature and Humidity Units: Engineering Reference

A ceiling-mounted constant temperature and humidity unit solves two problems at once: it holds temperature and humidity to a tight tolerance (±1°C / ±5% RH), and it does so without occupying any floor area. In server rooms, laboratories, and cleanrooms — where floor space is allocated to racks, benches, and process equipment — the climate system must disappear into the ceiling void while still delivering four coordinated functions: cooling, heating, dehumidification, and humidification. The control logic is identical to the floor-standing configuration; what changes is the installation engineering, which is where ceiling projects succeed or fail.

Installation Requirements Specific to Ceiling Units

Requirement	Specification Basis	What to Confirm at Inquiry
Ceiling-void clearance	Unit body + duct connections + service access must fit the void above the suspended ceiling	Void depth (mm); low-profile option available where clearance is limited
Condensate drainage	A concealed unit cannot drain by gravity; a built-in condensate pump lifts water to the building drain line	Drain route length and rise, within the pump's lift capacity
Humidification water supply	The humidification stage consumes water continuously during dry seasons	A permanent treated-water connection near the unit location
Ducted air distribution	Supply and return grilles laid out so conditioned air washes the room evenly from above	Room plan and grille positions; one unit can serve multiple grilles or zones
Service access	Filters, humidifier, and control board require periodic access	Access panel position in the ceiling design

Why Ducted Overhead Distribution Matters for Precision

A floor cabinet conditions the air nearest to itself first, creating a gradient across the room — acceptable for comfort, unacceptable for a ±1°C tolerance band. A ducted ceiling unit delivers supply air through multiple grilles distributed across the room plan and draws return air from a separate grille location, so the sensor reads representative room conditions rather than the discharge stream. This distribution pattern is what allows a single concealed unit to hold uniform conditions across a long equipment room, and it is the reason ceiling-mounted precision units are the standard choice for computer rooms and network closets. The server-room load profile — high sensible heat, continuous duty, no floor space — is detailed on the data center cooling and humidity control page.

Ceiling-Mounted vs. Floor-Standing: the Decision Criteria

Choose ceiling-mounted when floor space is scarce, the unit must stay hidden (cleanrooms, retail, customer-facing technical spaces), or ducted overhead distribution is needed for uniformity. Choose floor-standing when higher single-unit capacity, simpler service access, or the absence of a ceiling void makes a cabinet the practical answer. Both configurations hold the same ±1°C / ±5% RH tolerance — the decision is form factor and installation, not precision.

Manufacturing and Project Configuration

Concealed units are built on the GDH-CE ceiling-ducted platform at our Jiaxing production base, on 220V/50Hz or 380V power, with condensate-pump drainage and real-time temperature and humidity display as standard. Project-level configuration — capacity staging, low-profile housing, BMS integration, tighter tolerance bands — is handled through the OEM/ODM process. For sizing against your room plan, heat load, and ceiling-void dimensions, contact SHISHUO Engineering.

Configuration Matrix by Scenario

Step up cooling and dehumidification stages for high internal heat loads (server racks, equipment, lighting), add capacity for high air exchange, and specify a low-profile unit where ceiling-void depth is limited.

Scenario	Typical Size	Control Target	Recommended Configuration
Server room / network closet / small lab	Up to 30 m²	18–30°C / 40–70% RH	Compact ceiling-concealed unit (220V)
Mid-size lab / electronics workshop / computer room	30–80 m²	±1°C / ±5% RH	Standard ceiling ducted unit (220V/380V)
Production hall / large controlled space	80 m²+	±1°C / ±5% RH	Large-capacity ducted unit, or multiple (380V)
Condenser must sit outside the building	Any	±1°C / ±5% RH	Ceiling indoor + outdoor split
Limited ceiling void / low plenum	Any	±1°C / ±5% RH	Low-profile unit; confirm clearance at inquiry

Ceiling-Mounted Air Conditioner with Humidity Control — Concealed Constant Temperature and Humidity Units for Precision Environments

Why a Ceiling-Mounted Air Conditioner with Humidity Control

Independent Temperature AND Humidity Control

Ceiling-Mounted, Concealed, and Space-Saving

Ducted Overhead Air Distribution

Precision Tolerance (±1°C / ±5% RH)

Our Ceiling-Mounted Constant Temperature and Humidity Unit Range

Ceiling Ducted Constant Temperature and Humidity Unit (DXHW-3 to DXHW-70)

Precision Air Conditioner & Constant Temperature and Humidity Unit (DXHW Series)

Industrial Precision Air Conditioner for Data Center and Server Room (HSJ-03 to HSJ-60)

Industrial Humidifier and Dehumidifier Combo Unit (DS-03HS to DS-20HS, 9 Capacity Tiers)

In addition to ceiling-mounted constant temperature and humidity units, we also manufacture:

Applications We Serve

Computer Rooms, Server Rooms, and Network Closets

Electronics and Semiconductor Production

Laboratories and Testing Rooms

Metrology and Calibration Rooms

Pharmaceutical and Cleanroom Environments

Telecom and Equipment Rooms

Archive, Museum, and Precision Storage

Retail, Office, and Light Commercial Precision Spaces

How to Choose a Ceiling-Mounted Air Conditioner with Humidity Control

Ceiling Installation, Ducting, and Drainage

OEM and ODM for Constant Temperature and Humidity Units

Need a Sizing Calculation for Your Greenhouse?

About SHISHUO

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Frequently Asked Questions

What is a ceiling-mounted air conditioner with humidity control?

Ceiling-mounted or floor-standing — which should I choose?

Can it both add and remove humidity?

What temperature and humidity tolerance can it hold?

How is condensate drained from a ceiling-mounted unit?

What applications suit a ceiling-mounted precision unit?

Do you make custom and OEM units?

What voltage are the units, and do you ship internationally?

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