DD-FX Series — Ducted Inverter Climate Control with Heat Pump & Humidification, 92–360 L/day

Q: What is a Split System and how does it differ from a packaged unit?

A Split System consists of two physically separate units: an indoor unit (concealed in a ceiling void, plant area or wall) and an outdoor unit (the condenser — typically wall-mounted, on a balcony, roof or ground base). Copper refrigerant lines, a power and communication cable and — on the indoor side — a condensate drain connect them. A packaged unit contains the entire refrigerant cycle in one enclosure — usually on the roof or a wall, with only duct connections. Split systems offer aesthetic and acoustic advantages: the noisy compressor and condenser fan live outdoors, the indoor unit runs quietly and stays invisible. They also allow longer line runs (typically up to 15 m on small units and 30 m or more on larger ones), giving the installer more freedom. Almost all modern heat pumps and climate-control systems — including the DanVex DD-FX — use the split architecture for these reasons.

Q: Can one system really dehumidify, heat, cool, ventilate and humidify?

Yes — integrated multi-function units are an established category in commercial HVAC. The technical basis: dehumidification and cooling share the same refrigerant cycle (moisture condenses on the evaporator during cooling). Heating uses the same cycle in reverse (heat-pump mode). Ventilation is a damper-and-fan arrangement integrated into the air path. Humidification is an adiabatic module — a wetted pad in the supply stream that adds moisture on the controller's command. The advantage over separate systems is operational coordination: one controller runs all five functions together, holding target temperature and humidity simultaneously, instead of separate units that can conflict (the air conditioner drying while a separate humidifier adds moisture back). The DanVex DD-FX delivers all five through the Auto Climate mode driven by the 5-in-1 sensor.

Q: What is adiabatic humidification and why is it used in HVAC?

Adiabatic humidification adds moisture by passing the airstream through a wetted pad (cellulose or synthetic fibre). Water evaporates from the wet surface into the air, absorbing latent heat from it — the air leaves more humid and slightly cooler than it entered. "Adiabatic" refers to the absence of external heat input (unlike steam humidification, which boils water electrically). Three practical advantages: (1) energy efficiency — no electric heating; the evaporation energy comes from the airstream itself. (2) Cooling side effect — adiabatic humidification cools by 5–10 °C, useful in summer ventilation. (3) Hygienic operation — no boiler, no scale and no Legionella risk when the pad is replaced on the maintenance schedule. The DD-FX uses adiabatic humidification at 2–8 kg/h depending on model, controlled by the 5-in-1 sensor's humidity measurement.

Q: What is precision climate control and when does it matter?

Standard residential air conditioning holds temperature within ±2 °C while humidity is unregulated — it drifts between 35% and 65% RH depending on outdoor conditions and air-conditioner cycles. Precision climate control holds temperature and humidity simultaneously within tight tolerances — typically ±1 °C and ±5% RH with independent active control of both. Applications that require precision: beverage cellars (cork preservation needs 65–75% RH at 10–14 °C with minimal fluctuation); server rooms and data centres (ASHRAE TC 9.9 specifies tight envelopes); laboratories and cleanrooms (analytical instruments drift with humidity); museums and archives (ISO 11799 requires ±5% RH for paper and wood preservation); pharmaceutical production (GMP norms). The DD-FX delivers precision through continuous Full Inverter modulation, independent humidification control and the 5-in-1 sensor — unlike standard air conditioning, which sacrifices humidity for temperature.

Q: What is the difference between a heat pump and an air conditioner?

Technically a heat pump and an air conditioner use the same refrigerant cycle — it is the same machine. The difference is the direction of the cycle: one-way (air conditioner only — moves heat from indoors to outdoors) or reversible (heat pump — also moves heat from outdoors to indoors through a four-way reversing valve). An air conditioner only cools; a heat pump cools and heats. Almost all modern split systems are heat pumps, because the cost of the extra components (reversing valve and defrost control) is small against the value of the dual function. The DD-FX is a fully reversible heat-pump system: 5.4–21 kW cooling by model and 5.9–24 kW heating from the same outdoor unit and the same cycle, without separate equipment.

Q: Can one climate-control system hold different temperatures in different rooms?

A single Split System unit conditions the air it handles — supply air leaves the indoor unit at one temperature, and duct distribution gives every room on that network the same conditioning. For different temperatures in different rooms there are three approaches: (1) several DD-FX units — one per zone with independent control and full climate control of each; the typical choice for two or three distinct zones. (2) Zone dampers on one DD-FX — motorised dampers in the network throttle flow to individual rooms with partial temperature differentiation (typically ±2–3 °C between zones); suitable when the base conditions are similar. (3) A VRF system (variable refrigerant flow) — the multi-zone alternative in which one outdoor unit serves several indoor units with independent control; the right choice for buildings with ten or more distinct zones. The DD-FX is optimal for one zone or two or three rooms with similar requirements; VRF for larger multi-zone projects.

About the DD-FX Series

The DanVex DD-FX Series is a range of ducted Split System units combining dehumidification, heat-pump heating and cooling, ventilation, three-stage filtration and adiabatic humidification in a single installation. Each system consists of an Ultra-Slim indoor unit (concealed in a ceiling void or plant area) and an outdoor condenser unit (IPX4-rated for direct outdoor installation). Refrigerant piping, a power cable and communication wiring connect the two; ductwork connects to the indoor unit only.

Series ranges: dehumidification from 92 L/day (DD-136FX) to 360 L/day (DD-960FX); cooling 5.4–21 kW; heating 5.9–24 kW; adiabatic humidification 2–8 kg/h. Supply airflow 350–1800 m³/h at 180–300 Pa static pressure — sufficient for residential and commercial networks. Operating range +6…+48 °C ambient — the system holds room conditioning across a wider climate envelope than typical split air conditioners.

The DD-FX replaces five separate installations: a ducted dehumidifier, a heat-pump heating and cooling unit, a fresh-air ventilation unit, a HEPA air purifier and an adiabatic humidifier. The Auto Climate mode — driven by the 5-in-1 sensor on the return stream and a temperature + humidity sensor on the supply air — regulates all five functions autonomously on continuous measurement of indoor conditions. All models use R-32 refrigerant, an inverter compressor paired with an inverter fan and EEV for continuous regulation of airflow and refrigerant flow, E-Coating heat-exchanger protection, Modbus RTU RS-485 + Wi-Fi connectivity and UV + Anion purification with Antifungus treatment.

Models in the range

DD-136FX 92 L/day · cooling 5.4 kW · heating 5.9 kW · humidification 2 kg/h · 350 m³/h · 180 Pa · 1-Ph + 1-Ph · Full Inverter · HEPA H13 · E-Coating

Indicative coverage: ~50–90 m² depending on ceiling height and target conditions

The smallest model — luxury residential studios and one-bedroom apartments, beverage cellars, single server-room installations, boutique hotel rooms. R-32 × 2.5 kg, noise below 35 dB(A).

DD-168FX 140 L/day · cooling 8.2 kW · heating 9.8 kW · humidification 3 kg/h · 550 m³/h · 200 Pa · 1-Ph + 1-Ph · Full Inverter · HEPA H13 · E-Coating

Indicative coverage: ~80–130 m² depending on ceiling height and target conditions

Medium residential and small commercial — family apartments, larger beverage cellars, small medical consulting rooms, luxury serviced apartments. R-32 × 3 kg, noise below 38 dB(A).

DD-240FX 192 L/day · cooling 10 kW · heating 12.3 kW · humidification 4 kg/h · 750 m³/h · 200 Pa · 1-Ph + 3-Ph · Full Inverter · HEPA H13 · E-Coating

Indicative coverage: ~130–200 m² depending on ceiling height and target conditions

Larger residential and commercial — luxury family homes, multi-room hotel suites, medical clinics, IT rooms with HEPA requirements, laboratory instrument areas. R-32 × 3.5 kg, noise below 40 dB(A).

DD-380FX 240 L/day · cooling 12 kW · heating 13.5 kW · humidification 5 kg/h · 950 m³/h · 200 Pa · 1-Ph + 3-Ph · Full Inverter · HEPA H13 · E-Coating

Indicative coverage: ~180–280 m² depending on ceiling height and target conditions

Large residential and boutique commercial — large homes, boutique hotels, executive offices, restaurant dining rooms, multi-zone clinics. R-32 × 4.2 kg, noise below 40 dB(A).

DD-480FX 288 L/day · cooling 15 kW · heating 17.5 kW · humidification 6 kg/h · 1150 m³/h · 250 Pa · 1-Ph + 3-Ph · Full Inverter · HEPA H13 · E-Coating

Indicative coverage: ~250–380 m² depending on ceiling height and target conditions

Large commercial and small industrial — boutique retail complexes, luxury spa and wellness centres, medium server rooms, multi-zone laboratories, large medical facilities. R-32 × 5 kg, noise below 42 dB(A).

DD-720FX 336 L/day · cooling 18 kW · heating 20 kW · humidification 7 kg/h · 1500 m³/h · 250 Pa · 1-Ph + 3-Ph · Full Inverter · G4 + F7 · E-Coating

Indicative coverage: ~350–500 m² depending on ceiling height and target conditions

Large commercial — hotel and spa complexes, large executive offices, multi-zone medical centres, large server rooms, luxury retail and hospitality. R-32 × 5.5 kg, noise below 45 dB(A).

DD-960FX 360 L/day · cooling 21 kW · heating 24 kW · humidification 8 kg/h · 1800 m³/h · 300 Pa · 1-Ph + 3-Ph · Full Inverter · G4 + F7 · E-Coating

Indicative coverage: ~450–650 m² depending on ceiling height and target conditions

The largest model — large boutique commercial, multi-storey luxury installations, large hotel and spa complexes, large laboratories, luxury pre-cleanroom spaces. R-32 × 6.5 kg, noise below 45 dB(A).

Coverage figures are indicative for typical residential and boutique-commercial conditions (moderate moisture and heat load, 2.5–3.5 m ceilings, ordinary air-change rates). Climate-control selection depends on cooling, heating and moisture loads together — for precise selection, contact us with the project data.

Which model should I choose?

The right choice is decided by the combined load — cooling, heating, dehumidification and humidification are sized together. The two smallest models run entirely on single-phase 220–230 V (indoor and outdoor units); the larger models keep the indoor unit single-phase and require a three-phase 380–415 V supply for the outdoor condenser.

Criterion	DD-136FX	DD-168FX	DD-240FX	DD-380FX	DD-480FX	DD-720FX	DD-960FX
Dehumidification (L/day)	92	140	192	240	288	336	360
Cooling / heating (kW)	5.4 / 5.9	8.2 / 9.8	10 / 12.3	12 / 13.5	15 / 17.5	18 / 20	21 / 24
Humidification (kg/h)	2	3	4	5	6	7	8
Supply airflow (m³/h)	350	550	750	950	1150	1500	1800
Outdoor unit supply	1-Ph	1-Ph	3-Ph	3-Ph	3-Ph	3-Ph	3-Ph
Filtration	HEPA H13	HEPA H13	HEPA H13	HEPA H13	HEPA H13	G4 + F7	G4 + F7
Coverage (m²)	~50–90	~80–130	~130–200	~180–280	~250–380	~350–500	~450–650

Where is the DD-FX Series used?

The series targets installations where a single ceiling unit must deliver full climate control — temperature, humidity, fresh air and filtration — at the same time:

Luxury residentialBeverage cellarsServer rooms & data centres Laboratories & cleanroomsHealthcare facilitiesBoutique hotels & spas

Application guide

Application	Target temperature / humidity	Why DD-FX	Recommended models
Luxury residential homes	20–24 °C / 40–55%	One ceiling unit covers heating, cooling, dehumidification, fresh air and HEPA — replaces five systems	DD-168FX · DD-240FX · DD-380FX
Beverage cellars	10–14 °C / 65–75%	Low-temperature cooling down to +6 °C; precise humidification for cork integrity	DD-136FX · DD-168FX · DD-240FX
Server rooms and data centres	18–24 °C / 40–55%	ASHRAE TC 9.9 compliance; HEPA H13 against fine-dust deposition; redundant operation	DD-240FX · DD-380FX · DD-480FX
Laboratories and cleanrooms	18–24 °C / 30–60%	Precise joint temperature and humidity control; HEPA H13; pressure-stable supply	DD-240FX · DD-380FX · DD-480FX
Healthcare clinics	20–24 °C / 30–60%	ASHRAE 170 compliance; HEPA-grade filtration; fresh air with CO₂ control	DD-168FX · DD-240FX · DD-380FX · DD-480FX
Boutique hotels and spas	20–26 °C / 45–60%	Single-system aesthetics; quiet operation; climate per zone	DD-380FX · DD-480FX · DD-720FX
Radiant cooling systems (chilled ceilings / walls / floors)	Dew point below the chilled-surface temperature	Neutral-temperature dehumidification prevents condensation on radiant surfaces — the first operating condition	DD-240FX · DD-380FX · DD-480FX · DD-720FX
Museums and private galleries	18–22 °C / 45–55% ±5%	Tight joint temperature and humidity stability; HEPA against airborne particles	DD-168FX · DD-240FX · DD-380FX
Luxury retail floors	20–24 °C / 40–55%	Integrated climate with no visible equipment; CO₂-driven fresh air for footfall peaks	DD-480FX · DD-720FX · DD-960FX

Split System architecture and integrated operation

The DD-FX is a Split system: an Ultra-Slim indoor unit concealed in the ceiling void, and an IPX4-rated outdoor condenser mounted on an exterior wall, balcony, roof or ground base. R-32 piping, a power cable and shared communication connect the two, with condensate drainage on the indoor unit.

One installation, five functions. Each system delivers five climate functions at once: dehumidification through the refrigerant cycle; cooling through the same cycle in cooling mode (5.4–21 kW); heating by heat-pump operation with the cycle reversed (5.9–24 kW, across the full +6…+48 °C ambient range); ventilation through the fresh-air inlet with an automatic damper (0–500 m³/h); and humidification through the adiabatic humidification module (2–8 kg/h water evaporation across a wetted media pad). Three-stage filtration (G4 + F7 + HEPA H13 on most models, G4 + F7 on DD-720FX / DD-960FX) works across all modes.

Auto Climate mode. The 5-in-1 sensor on the return stream continuously measures CO₂, PM2.5, TVOC, humidity and temperature, and a supply-air sensor (temperature + humidity) monitors the delivered conditioning. The controller adjusts compressor speed, fan speed, fresh-air damper position, humidifier activation and reheat balance to the continuous measurements — with no user input after the initial set-points. A manual mode is available for project-specific operating profiles.

Dehumidification without raising air temperature. Unlike conventional dehumidifiers, which return the heat of condensation to the supply stream and warm the room, the DD-FX balances the heat-pump cycle between dehumidification and reheat — delivering dry air at neutral or reduced temperature according to the set-point. This property is critical for the UAE climate, and it is the technical basis for DD-FX operation with radiant cooling systems (chilled ceilings, walls and floors): the system holds the room-air dew point below the cold-surface temperature and prevents condensation on it — the first operating condition of any radiant cooling installation.

Low-temperature cooling down to +6 °C. Most split air conditioners falter below +18 °C room temperature because the refrigerant cycle loses efficiency and the evaporator coil ices up. The DD-FX is designed for continuous operation down to +6 °C room temperature with full cooling and dehumidification — the right choice for beverage cellars, server rooms, cold laboratories and cold museum stores. The Hot Gas Defrost system keeps operation going in cold conditions without the long defrost cycles that interrupt conventional heat pumps.

Where does DD-FX not fit? High-capacity industrial duty above 360 L/day — use the DD Series (up to 960 L/day) without climate control. Pure ducted dehumidification without heating/cooling/humidification — use DD or DD-F (lower cost). Cleanrooms with an H14 / ULPA requirement (operating theatres, Grade A pharma) — the DD-FX uses H13, suitable for most contexts but not full Grade A.

How does DD-FX compare with the alternatives?

Alternative	When it beats DD-FX	When DD-FX is better
Multi-Split air conditioner (heating and cooling only)	No humidity or fresh-air requirement; pure heating/cooling for ordinary apartments and offices; lower price.	Humidity control, CO₂-managed fresh air, HEPA filtration and humidification are required beyond heating/cooling — the DD-FX delivers all five in one installation.
Central air conditioning (AHU with reheat coil, humidifier and HEPA bank)	A very large facility (above 2000 m²); humidity and air-quality strategy at AHU level; new-construction stage.	Retrofits; local climate-control zones (individual rooms or floors); faster schedule; lower cost; zone-by-zone optimisation.
DD or DD-F + separate heat pump + ERV + humidifier (modular approach)	A partial installation already exists (e.g. a heat pump is installed); phased capital spending; specific architect preferences for equipment.	One ceiling installation, one controller, one commissioning and one service contract — a substantial aesthetic and operational simplification.
VRF system (variable refrigerant flow, multi-zone)	Many small zones (10+) across a large building; per-room temperature control is the primary requirement; large commercial.	A single-zone or few-zone installation; humidity control, fresh air and HEPA are part of the requirement; lower operational complexity.

Key technologies — at a glance

Split System architecture — concealed Ultra-Slim indoor unit + IPX4 outdoor condenser; ductwork connects to the indoor unit only
Full Inverter across the range — inverter compressor, inverter fan and EEV as one system; ±2–3% RH stability and energy savings up to 40% versus fixed speed
Heat-pump heating and cooling — a reversible cycle delivers 5.4–21 kW cooling and 5.9–24 kW heating; typical COP 3.5–4.5
Dehumidification without raising air temperature — reheat balance in the heat-pump cycle delivers dry air at neutral or reduced temperature; the technical basis for working with radiant cooling systems in the Gulf climate
Low-temperature cooling down to +6 °C — for beverage cellars, server rooms and cold stores where standard split units stop
Adiabatic humidification module — 2–8 kg/h water evaporation across a wetted medium; cools and humidifies at once; no boiler, no scale, no chemical treatment
Three-stage filtration — G4 + F7 + HEPA H13 on most models (G4 + F7 on DD-720FX / DD-960FX); H13 captures at least 99.95% at MPPS
5-in-1 sensor + supply sensor — continuous measurement on the return and temperature + humidity on the supply; autonomous Auto Climate operation
Automatic fresh-air valve — CO₂-driven outdoor intake (0–500 m³/h by model); HEPA-filtered before mixing
Hot Gas Defrost — routes hot compressor gas directly into the coil, melting ice quickly and keeping operation going in cold conditions
UV + Anion + Antifungus — in-stream sterilisation and antimicrobial coating inside the housing; self-cleaning inside the unit
E-Coating on the heat exchanger across the range — an electrochemical anti-corrosion layer resistant to chlorine-laden, marine and high-humidity environments
Wi-Fi + Modbus RTU RS-485 standard on every model; BMS / SCADA integration with auto-restart that keeps settings

Technical specifications — DD-FX Series

Parameter	DD-136FX	DD-168FX	DD-240FX	DD-380FX	DD-480FX	DD-720FX	DD-960FX
Dehumidification (30 °C / 80% RH)	92 L/day	140	192	240	288	336	360
Rated cooling	5400 W	8200	10 000	12 000	15 000	18 000	21 000
Rated heating	5900 W	9800	12 300	13 500	17 500	20 000	24 000
Humidification capacity	2 kg/h	3	4	5	6	7	8
Supply airflow	350 m³/h	550	750	950	1150	1500	1800
Fresh-air flow	0–175 m³/h	0–225	0–250	0–300	0–350	0–400	0–500
Return airflow	175–350 m³/h	275–500	500–750	650–950	800–1150	1100–1500	1300–1800
External static pressure	180 Pa	200	200	200	250	250	300
Refrigerant	R-32 × 2.5 kg	× 3 kg	× 3.5 kg	× 4.2 kg	× 5 kg	× 5.5 kg	× 6.5 kg
Filtration	G4 / F7 / H13	G4 / F7 / H13	G4 / F7 / H13	G4 / F7 / H13	G4 / F7 / H13	G4 / F7	G4 / F7
Outdoor unit supply	220–230 V 1-Ph	220–230 V 1-Ph	380–415 V 3-Ph	380–415 V 3-Ph	380–415 V 3-Ph	380–415 V 3-Ph	380–415 V 3-Ph
Indoor unit power / current	170 W / 0.8 A	260 W / 1.2 A	350 W / 0.5 A	380 W / 0.5 A	400 W / 0.6 A	420 W / 0.7 A	550 W / 0.9 A
Outdoor unit power / current	1900 W / 8.6 A	2870 W / 12.9 A	3900 W / 5.9 A	4200 W / 6.3 A	4400 W / 6.6 A	5200 W / 7.9 A	6500 W / 9.8 A
Noise level (1 m)	< 35 dB(A)	< 38	< 40	< 40	< 42	< 45	< 45
Indoor unit dimensions	1260×799×320 mm	1260×799×320 mm	1260×819×440 mm	1260×819×440 mm	1260×819×440 mm	1247×820×600 mm	1247×820×600 mm
Outdoor unit dimensions	880×370×655 mm	880×370×655 mm	1014×377×1265 mm	1014×377×1265 mm	1014×377×1265 mm	By configuration	By configuration
Operating temperature range	+6…+48 °C ambient
Compressor	Inverter (Full Inverter)
Heat exchanger	E-Coating
Air purification	UV sterilisation + anion generator + Antifungus
Return-stream sensor	5-in-1: CO₂ · PM2.5 · TVOC · RH · T°
Supply-air sensor	Temperature + humidity
Indoor unit supply	220–230 V single-phase / 50–60 Hz
Water protection (outdoor)	IPX4
Electrical protection class	Class I
Connectivity	Wi-Fi + Modbus RTU RS-485

Frequently asked questions

What is a Split System and how does it differ from a packaged unit?

A Split System consists of two physically separate units: an indoor unit (concealed in a ceiling void, plant area or wall) and an outdoor unit (the condenser — typically wall-mounted, on a balcony, roof or ground base). Copper refrigerant lines, a power and communication cable and — on the indoor side — a condensate drain connect them. A packaged unit contains the entire refrigerant cycle in one enclosure — usually on the roof or a wall, with only duct connections. Split systems offer aesthetic and acoustic advantages: the noisy compressor and condenser fan live outdoors, the indoor unit runs quietly and stays invisible. They also allow longer line runs (typically up to 15 m on small units and 30 m or more on larger ones), giving the installer more freedom. Almost all modern heat pumps and climate-control systems — including the DanVex DD-FX — use the split architecture for these reasons.

Can one system really dehumidify, heat, cool, ventilate and humidify?

Yes — integrated multi-function units are an established category in commercial HVAC. The technical basis: dehumidification and cooling share the same refrigerant cycle (moisture condenses on the evaporator during cooling). Heating uses the same cycle in reverse (heat-pump mode). Ventilation is a damper-and-fan arrangement integrated into the air path. Humidification is an adiabatic module — a wetted pad in the supply stream that adds moisture on the controller's command. The advantage over separate systems is operational coordination: one controller runs all five functions together, holding target temperature and humidity simultaneously, instead of separate units that can conflict (the air conditioner drying while a separate humidifier adds moisture back). The DanVex DD-FX delivers all five through the Auto Climate mode driven by the 5-in-1 sensor.

What is adiabatic humidification and why is it used in HVAC?

Adiabatic humidification adds moisture by passing the airstream through a wetted pad (cellulose or synthetic fibre). Water evaporates from the wet surface into the air, absorbing latent heat from it — the air leaves more humid and slightly cooler than it entered. "Adiabatic" refers to the absence of external heat input (unlike steam humidification, which boils water electrically). Three practical advantages: (1) energy efficiency — no electric heating; the evaporation energy comes from the airstream itself. (2) Cooling side effect — adiabatic humidification cools by 5–10 °C, useful in summer ventilation. (3) Hygienic operation — no boiler, no scale and no Legionella risk when the pad is replaced on the maintenance schedule. The DD-FX uses adiabatic humidification at 2–8 kg/h depending on model, controlled by the 5-in-1 sensor's humidity measurement.

What is precision climate control and when does it matter?

Standard residential air conditioning holds temperature within ±2 °C while humidity is unregulated — it drifts between 35% and 65% RH depending on outdoor conditions and air-conditioner cycles. Precision climate control holds temperature and humidity simultaneously within tight tolerances — typically ±1 °C and ±5% RH with independent active control of both. Applications that require precision: beverage cellars (cork preservation needs 65–75% RH at 10–14 °C with minimal fluctuation); server rooms and data centres (ASHRAE TC 9.9 specifies tight envelopes); laboratories and cleanrooms (analytical instruments drift with humidity); museums and archives (ISO 11799 requires ±5% RH for paper and wood preservation); pharmaceutical production (GMP norms). The DD-FX delivers precision through continuous Full Inverter modulation, independent humidification control and the 5-in-1 sensor — unlike standard air conditioning, which sacrifices humidity for temperature.

What is the difference between a heat pump and an air conditioner?

Technically a heat pump and an air conditioner use the same refrigerant cycle — it is the same machine. The difference is the direction of the cycle: one-way (air conditioner only — moves heat from indoors to outdoors) or reversible (heat pump — also moves heat from outdoors to indoors through a four-way reversing valve). An air conditioner only cools; a heat pump cools and heats. Almost all modern split systems are heat pumps, because the cost of the extra components (reversing valve and defrost control) is small against the value of the dual function. The DD-FX is a fully reversible heat-pump system: 5.4–21 kW cooling by model and 5.9–24 kW heating from the same outdoor unit and the same cycle, without separate equipment.

Can one climate-control system hold different temperatures in different rooms?

A single Split System unit conditions the air it handles — supply air leaves the indoor unit at one temperature, and duct distribution gives every room on that network the same conditioning. For different temperatures in different rooms there are three approaches: (1) several DD-FX units — one per zone with independent control and full climate control of each; the typical choice for two or three distinct zones. (2) Zone dampers on one DD-FX — motorised dampers in the network throttle flow to individual rooms with partial temperature differentiation (typically ±2–3 °C between zones); suitable when the base conditions are similar. (3) A VRF system (variable refrigerant flow) — the multi-zone alternative in which one outdoor unit serves several indoor units with independent control; the right choice for buildings with ten or more distinct zones. The DD-FX is optimal for one zone or two or three rooms with similar requirements; VRF for larger multi-zone projects.

Explore further

Ducted dehumidifiers — overview and selection guide →
DD Series — high-capacity dehumidification 140–960 L/day without climate control →
DD-F Series — dehumidification with fresh air and HEPA, at lower cost →
AD adsorption dehumidifiers — for targets below 35% RH and cold environments →

DD-FX Series — ducted inverter climate control with heat pump and humidification, 92–360 L/day