Ducted Heat Pump SENVILLE SENA R454B | 18000 BTU

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• Federal Rebate:
• Provincial Rebate: 1800$
• Energy Star®: Oui
• WiFi: En Option
• AHRI: 215735302
• Efficiency: 18.0 SEER
• Warranty (Compressor - Parts - Labor): 10-10-0
• Additional Warranty (10-10-10): Possible
• Voltage: 220V
• Sound Pressure Level (Outdoor): 57.0 dB(A)
• Gas (Freon): R-454B

An 18,000 BTU ducted heat pump that disappears into the ceiling while maintaining genuine winter performance down to -30 °C

A ducted heat pump meets a very different need from a wall-mounted unit. The goal is not merely to heat and cool: it is also to preserve the interior architecture by almost completely concealing the equipment. In a well-designed installation, only the supply grilles, return grille, and wall control remain visible.

The SENVILLE SENA R454B 18,000 BTU, with SENA-18HF-OG outdoors and SENA-18HF-IDG indoors, is specifically designed according to this logic. Senville documentation describes the system as a concealed 18,000 BTU ducted mini-split with a heat pump, intended for heating and air conditioning.

At AirGreen Heat Pumps, Air Conditioning & Heating, this type of system is particularly interesting in Montreal, Laval, Longueuil, the South Shore, and the North Shore when a homeowner wants to avoid several visible wall-mounted units while air-conditioning one or more nearby rooms with the help of a small duct network.

The combination published on the AirGreen listing includes, among other things:

• Outdoor unit: SENA-18HF-OG
• Ducted indoor unit: SENA-18HF-IDG
• AHRI: 215735302
• ENERGY STAR®: yes
• Cold Climate: yes
• ENERGY STAR ID: 3630049
• Commercial capacity: 18,000 BTU
• Refrigerant: R-454B
• SEER2: 18.0
• EER2: 12.0
• HSPF2: 10.5
• WiFi: optional
• Power supply: 220 V
• Piping: 1/4 in – 1/2 in
• advertised heating down to -30 °C
• $1,800 in advertised provincial rebates on the AirGreen listing.

The manufacturer’s brochure confirms an SEER2 of 18, an EER2 of 12, an HSPF2-4 of 10.5, and a rated COP of 3.37.

The main advantage of a ducted system: distributed comfort without a visible wall-mounted head

The indoor unit measures only approximately:

34.65 in × 26.54 in × 8.27 in.

Its height of only 8.27 inches is particularly useful when the system must be integrated into a dropped ceiling, soffit, interstitial ceiling space, or relatively low mechanical area.

This design distributes air through short ducts to several grilles.

A typical project might include, for example:

• an outlet in a primary bedroom;
• a second outlet in an adjacent office;
• a discreet return grille in the corridor or in a central area.

In this case, the owner gets more integrated air distribution than with two separate wall-mounted heads.

Ducted does not mean a complete central system

This is an important distinction.

An 18,000 BTU ducted heat pump is not necessarily designed to supply a large duct network serving an entire house like a traditional air-handling unit.

It is better suited to a compact, properly sized duct network.

At AirGreen, we therefore examine:

• the length of the ducts;
• their diameter;
• elbows;
• the number of outlets;
• static pressure;
• the size of the return grille.

A poor duct network can compromise performance even if the heat pump itself is excellent.

Up to 600 CFM: the duct network must be designed around the actual airflow

The Senville brochure provides the following indoor airflow rates:

• Turbo: 600.4 CFM
• High speed: 559.2 CFM
• Medium speed: 500.3 CFM
• Low speed: 441.4 CFM.

This means that the system must be able to move several hundred cubic feet of air per minute without creating excessive pressure.

A grille that is too small or unnecessarily narrow ducts can cause:

• more noise;
• lower airflow at the outlets;
• uneven distribution;
• a loss of comfort;
• less efficient operation.

In our HVAC projects in Montreal, Laval, and Longueuil, we often see that the success of a ducted system depends as much on the ventilation network as on the heat pump itself.

32 to 40 dB(A) according to the brochure: suitable for a concealed unit

The manufacturer's documentation indicates an indoor sound level of:

40 / 39 / 38 / 32 dB(A) depending on the speed.

The AirGreen specifications currently state approximately 29.5 to 40 dB(A).

In any case, the ducted design provides an additional acoustic advantage: the unit itself is installed away from the occupied area or behind a finish.

However, perceived noise depends heavily on the installation.

A supply vent that is too small can produce more noise than an otherwise very quiet indoor unit.

An 18,000 BTU commercial capacity with inverter modulation

The brochure indicates a nominal cooling capacity of 17,000 BTU/h, with a modulation range from 6,500 to 18,800 BTU/h.

In heating mode, it indicates a nominal capacity of 19,000 BTU/h, with a range from 8,900 to 22,000 BTU/h.

The commercial designation 18,000 BTU therefore corresponds to the system category, but its actual performance varies depending on the operating mode and load.

This inverter modulation is particularly well suited to a ducted unit.

When the setpoint temperature is nearly reached, the system can reduce its output rather than constantly operating at full capacity.

Why this modulation is important in a bedroom or office

An overly aggressive system can cause:

• short cycles;
• temperature fluctuations;
• an overly noticeable airflow;
• intermittent noise.

A properly sized variable-capacity unit, on the other hand, can operate more gradually.

Comfort then becomes more stable, especially when the duct network is properly balanced.

Heating at -8 °C, -15 °C, and -30 °C: what the AirGreen data sheet actually indicates

The AirGreen data sheet provides very useful figures:

• 15,000 BTU/h at -8 °C
• 18,000 BTU/h at -15 °C
• 9,000 BTU/h maximum at -30 °C

The indicated COP is approximately:

• 2.7 at -8 °C
• 1.51 at the maximum point at -30 °C

The brochure confirms that the system can operate in heating mode down to -22 °F, or -30 °C.

This distinction is essential.

The heat pump can continue heating at -30 °C, but that does not mean it retains 18,000 BTU at that temperature.

At -15 °C, the capacity remains particularly impressive

The AirGreen data sheet indicates 18,000 BTU/h at -15 °C.

For the climate of Greater Montréal, this figure is often more important than the performance observed at -30 °C, since the heat pump can provide a significant portion of the heating for much of the winter.

If the space requires less than 18,000 BTU/h at -15 °C, the unit can still handle a large portion of the load.

At -30 °C, with approximately 9,000 BTU/h maximum, a supplementary heat source may nevertheless be required depending on the building's heat loss.

Installation, ductwork, R-454B, and controls: the technical details that make all the difference in a ducted system

The indoor unit must remain accessible after the work is complete

The ducted system is designed to be hidden, but it must never become inaccessible.

We must provide access to:

• the filter;
• the evaporator;
• the drain;
• the electronic control board;
• the fan;
• the refrigerant connections.

A system completely enclosed behind a finished ceiling without an access hatch can turn a simple maintenance operation into demolition work.

At AirGreen, we prefer to integrate access into the design from the outset.

The return air is just as important as the outlets

A ducted system cannot blow properly if it cannot draw in enough air.

We must size the return grille according to the system's airflow.

With up to 600 CFM, the return airflow must be sufficient to prevent:

• whistling;
• excessive pressure;
• a reduction in airflow;
• noisier operation.

This step is often overlooked when the focus is solely on the visible supply grilles.

Two or three small outlets can be more effective than a single large grille

Depending on the room layout, we can distribute the air among several outlets.

For example, in a large bedroom with a walk-in closet and an adjacent bathroom, two outlets can sometimes produce a more even temperature than a single register located at one end.

But the outlets should not be multiplied arbitrarily.

Each branch adds resistance to the system and changes the available airflow.

The 8.27-inch thickness makes several installations easier

The indoor unit’s low height is one of its practical advantages.

At only 8.27 in, it can fit into certain ceilings where a conventional air handler would be impossible.

However, the necessary clearances around the cabinet, the drain, and the connections must be added.

The figure of 8.27 inches should therefore not be used as the total installation height.

R-454B with a factory charge for up to 25 feet

The SENVILLE uses R-454B.

The documentation indicates a charge of 55.38 oz and a factory charge intended for up to 25 feet.

Senville also specifies that a 50-foot line set requires an on-site charge adjustment.

The AirGreen product page indicates piping:

1/4 in – 1/2 in.

During a replacement, we must therefore carefully check the size of the existing lines.

The refrigerant line routing must be planned at the same time as the duct network

With a wall-mounted unit, the refrigerant lines can often exit directly behind the head.

With a ducted system, the indoor unit can be located much farther from the exterior wall.

The project must therefore coordinate:

• refrigerant lines;
• drainage;
• ducts;
• power supply;
• thermostat;
• service access.

This is one of the reasons why installing a ducted system requires more planning than a conventional wall-mounted heat pump.

Wired wall control

The brochure indicates wired wall control for this system.

This makes particular sense for a ducted unit, since the indoor unit is not directly accessible or visible.

The temperature is controlled from the wall, as with a thermostat.

The documentation also indicates Alexa compatibility, while the AirGreen product page specifies that WiFi is optional.

This distinction should be confirmed when ordering if phone control is an important criterion.

A user review specifically points out the thermostat wiring

The brochure contains a verified buyer review dated July 3, 2026, which mentions that the thermostat wiring was not very clear.

This comment highlights a specific point: on a ducted system, the wall control is an integral part of the installation.

At AirGreen, we want the wiring, control addressing, and commissioning to be completed before closing the ceilings or access panels.

Electrical requirements: a discrepancy between the AirGreen product page and the brochure

The AirGreen product page currently states:

MCA: 15 A

MOP: 15 A

The Senville brochure, however, indicates:

MCA: 19 A

maximum fuse: 20 A.

For an actual installation, we must therefore use the data corresponding to the unit actually delivered, its nameplate, and the technical documentation applicable to the exact combination.

This discrepancy should also be verified on the product page before final publication.

The outdoor unit is larger than a small 9,000 or 12,000 BTU unit

The outdoor dimensions are:

35.04 in × 13.46 in × 26.50 in

for a weight of approximately 99.87 lb.

The brochure indicates an outdoor sound level of 59 dB(A), while the AirGreen product page currently shows 57 dB(A).

As with ampacity, this difference must be tied to the exact combination and the final technical data sheet used.

The outdoor location must take noise and snow into account

We check:

• distance from bedrooms;
• windows;
• deck;
• neighbor;
• airflow;
• height above the ground;
• winter accumulation;
• ease of access.

An outdoor unit weighing nearly 100 lb also requires a stable support.

ENERGY STAR and Cold Climate

The brochure clearly presents the SENVILLE ducted system as ENERGY STAR® and capable of providing heating down to -30 °C.

The AirGreen product page also identifies:

AHRI 215735302

ENERGY STAR 3630049

Cold Climate: yes.

These references are particularly important for verifying financial assistance programs.

Displayed provincial rebate: $1,800

The AirGreen product page currently indicates a $1,800 provincial rebate.

Since the rules and amounts may change, we always confirm eligibility at the time of quoting.

The exact SENA-18HF-OG + SENA-18HF-IDG combination must be used for this verification.

Warranty: the brochure and the AirGreen product page do not provide the same coverage

The AirGreen product page states:

10-year compressor – 10-year parts – 0-year labor

with a possible additional warranty.

Senville states in the brochure:

10-year compressor warranty – 5-year parts warranty.

The same coverage is repeated in the technical table.

If an extended parts warranty is offered by AirGreen, the distributor or a registration program, it must be confirmed in the terms of sale.

What type of project is this 18,000 BTU ducted heat pump particularly well suited for?

We consider it particularly when a homeowner is looking for:

• a heat pump without a visible wall-mounted unit;
• two or more small air outlets;
• a system for a primary bedroom and an adjacent room;
• a solution for one section of a house without a complete central ductwork system;
• installation in a false ceiling;
• a Cold Climate heat pump;
• heating down to -30 °C;
• a wall control rather than a remote aimed at a wall-mounted head.

When a wall-mounted unit would be simpler

A ducted system is not automatically the best choice.

A wall-mounted heat pump may make more sense when:

• no ceiling space is available;
• a false ceiling would have to be built solely for the system;
• the ductwork would be too complex;
• maintenance access would be difficult;
• the budget favors a simpler installation.

The right choice therefore depends on the building as much as on the product.

Why choose AirGreen to install a SENVILLE ducted heat pump

At AirGreen, a ducted installation is planned as a complete small ventilation system.

We check, among other things:

1. the actual required capacity;
2. the indoor unit's location;
3. the number of outlets;
4. the airflow of each branch;
5. the return grille;
6. drainage;
7. the refrigerant lines;
8. service access;
9. the electrical supply;
10. the wall control;
11. the outdoor unit's placement.

We carry out ducted heat pump projects in Montreal, Laval, Longueuil, on the South Shore, the North Shore and in Montérégie when aesthetics and air distribution justify a more integrated solution than a wall-mounted head.

The SENVILLE SENA R454B 18,000 BTU ducted heat pump offers an interesting technical package: SEER2 18, HSPF2-4 10.5, up to 600 CFM, an indoor unit only 8.27 inches high, heating down to -30 °C, inverter modulation and ENERGY STAR certification. The manufacturer's brochure confirms these key features.

Contact AirGreen for a quote on the SENVILLE SENA R454B 18,000 BTU ducted heat pump, to assess your ductwork and plan a complete HVAC installation in Montreal, Laval, Longueuil, on the South Shore or the North Shore.