YORK P Series Wall-Mounted Heat Pump 18 SEER | 12000 BTU 115V
SEER2 (Seasonal Energy Efficiency Ratio)
HSPF2 (Seasonal Heating Efficiency)
EER2 (Instantaneous cooling efficiency)
CFM (Airflow)
A compact 115 V wall-mounted heat pump for projects where the electrical supply matters as much as comfort
The YORK P Series 12,000 BTU 115 V wall-mounted heat pump holds a distinctive place among ductless systems. Its rated capacity of 12,000 BTU/h in cooling, operation on 115 V, Inverter technology compressor, and heating capacity down to -20 °C make it an option worth considering for certain apartments, condominiums, older homes, offices, or additions where a 208/230 V installation is not necessarily the most practical solution.
At AirGreen, when we assess a wall-mounted heat pump installation in Montreal, Laval, Longueuil, the North Shore, or the South Shore, we never look only at the number of BTUs. The available voltage, electrical panel capacity, room layout, refrigerant line length, possible outdoor unit location, and the homeowner’s expectations for winter heating directly influence the choice.
The pair that interests us here is very specific:
- Outdoor unit: DHP12CSB11S
- Indoor unit: DHP12NWB11S
- Rated cooling capacity: 12,000 BTU/h
- Rated heating capacity: 13,000 BTU/h
- Power supply: 115 V, single-phase, 60 Hz
- Refrigerant: R-410A
- Refrigerant piping: 1/4 in. liquid and 3/8 in. gas
- Heating operation: down to -20 °C
- Wi-Fi: available with adapter
- AHRI listed on our product sheet: 8578533
The YORK brochure confirms a modulating capacity for this combination of 3,753 to 12,500 BTU/h in cooling and 3,412 to 15,013 BTU/h in heating, with an EER of 10.55, a SEER of 16, and an HSPF of 9.
An important clarification about the name “P Series 18 SEER”
The commercial name of this product line can easily cause confusion. YORK presents the family as the P Series up to 18 SEER, but the 2020 technical documentation indicates that the DHP12NWB11S / DHP12CSB11S 12,000 BTU, 115 V pair has a SEER of 16, not 18.
This is a distinction we consider important at AirGreen. The maximum efficiency advertised for an entire series is not always the efficiency of each of its capacities and electrical configurations.
It is also important to avoid directly comparing this SEER with the SEER2 of newer heat pumps. The YORK brochure used for this P Series applies the older SEER, EER, and HSPF metrics. When a property owner compares this unit with a current-generation R-32 or R-454B heat pump, we compare the technical specifications according to their respective evaluation methods rather than simply placing two figures side by side.
Why 115 V can be beneficial in a renovation project
One of the main distinguishing features of the DHP12CSB11S model is its 115 V power supply.
In many older Montreal buildings, duplexes, triplexes, certain condos, or commercial spaces developed in stages, electrical constraints can play a significant role. A 115 V unit can sometimes simplify the electrical design compared with a heat pump requiring a 208/230 V power supply.
However, this does not mean that the unit should be connected to a standard residential outlet.
For the 12,000 BTU model, YORK specifies:
Rated cooling current: 12.4 A,
Rated heating current: 13.5 A,
MCA: 20 A,
MOCP: 30 A.
The electrical installation must therefore be planned correctly. At AirGreen, we check the panel configuration, electrical routing, and equipment requirements before considering whether a 115 V system actually represents an advantage for the building.
A more useful modulating capacity than a simple 12,000 BTU figure
An Inverter heat pump does not operate continuously at its maximum capacity. It adjusts the compressor output to the room’s actual demand.
For this YORK P Series, the stated cooling range is 3,753 to 12,500 BTU/h. In heating mode, modulation ranges from 3,412 to 15,013 BTU/h.
This range is important in a primary bedroom, living room, open-concept apartment, or office whose needs vary significantly depending on the time of day. As the temperature approaches the setpoint, the unit can reduce its capacity rather than operate only in on-off cycles.
In the field, this is precisely what we look for when properly sizing a system: a machine capable of operating for long periods at partial load instead of an oversized unit that reaches the target temperature quickly, shuts off, and then restarts frequently.
An oversized heat pump is not automatically more comfortable. It can lead to shorter cycles, less consistent humidity management, and more noticeable temperature fluctuations.
Heating down to -20°C: useful, but it is important to understand what this means
The 12,000 BTU P Series is specified to operate in heating mode between -20 °C and 24 °C outdoors. Its outdoor cooling range extends from -18 °C to 46 °C. YORK also confirms the use of R-410A for this generation of equipment.
However, operation permitted down to -20 °C does not necessarily mean that the unit delivers its full rated capacity of 13,000 BTU at -20 °C.
The brochure provides a rated capacity and an operating range, but this table does not give the exact heating capacity at -8 °C, -15 °C, and -20 °C for this pair. We therefore avoid making up these values.
For a Greater Montreal homeowner who wants to use a heat pump as the primary heating source, this point is essential. Winter temperatures in Montreal, Laval, Longueuil, the North Shore, and the South Shore can fall below -20 °C. A serious analysis must then take into account the existing backup heating system and the home's actual heating load.
Indoor sound level: 29 dB(A) at the lowest setting
Acoustic comfort is particularly important when an indoor unit is installed in a bedroom, office, or small condo.
For the DHP12NWB11S, YORK lists four sound pressure levels corresponding to the different fan speeds:
43 / 39 / 35 / 29 dB(A).
The airflow rate varies accordingly between:
400 / 318 / 241 / 194 CFM.
These four levels give the unit some flexibility. At low demand, an airflow rate of 194 CFM and a stated sound level of 29 dB(A) are much better suited to a bedroom than continuous operation at maximum speed.
The official dimensions of the 12,000 BTU indoor unit are 33 in wide × 11 in deep × 8 in high, or approximately 845 × 289 × 209 mm. The documentation indicates a net weight of approximately 22 lb.
This detail deserves emphasis because some older online listings may show a width of 31 in. For the DHP12NWB11S, the YORK technical table provided in the brochure clearly indicates 33 × 11 × 8 in.
Vertical and horizontal louvers: true control over air distribution
The air distribution of a wall-mounted heat pump directly affects the feeling of comfort. A unit can reach the right temperature while still creating an uncomfortable area if its airflow blows directly onto a sofa, bed, or desk.
The P Series feature table notably mentions:
3D Auto Swing, including vertical and horizontal oscillation,
Up and Down Swing,
Left and Right Swing,
as well as Fixed-Angle Swing.
This helps distribute the air over a wider area and better adapt the airflow to the room’s geometry.
At AirGreen, the positioning of the unit is nevertheless more important than the sophistication of the louvers. Installing a wall-mounted unit simply because a wall is available can produce a mediocre result. Instead, we look for a position that promotes natural airflow throughout the room while avoiding blowing directly on the occupants.
Standard Remote and Optional Wi-Fi
The P Series comes with a DRCPX wireless remote control. Wi-Fi is not built in directly: the documentation indicates that a CS532AH adapter is required.
The mobile app can then allow certain settings to be changed from a phone or tablet. YORK documentation also mentions the EWPE Smart app for the P and X Series when the necessary adapter is installed.
For a cottage, a dwelling used occasionally, or a room whose temperature must be adjusted before the occupants arrive, this option can be practical. For a homeowner who never uses remote controls, keeping the standard remote is just as reasonable.
Installation in Montreal, Laval, Longueuil, on the North Shore and South Shore: the details that determine the result
1/4 in. - 3/8 in. piping and a maximum length of 65 feet
The DHP12CSB11S uses a 1/4 in. liquid line and a 3/8 in. gas line.
For the 12,000 BTU 115 V model, YORK also indicates:
- maximum total piping length: 65 ft (20 m);
- maximum height difference: 33 ft (10 m);
- drain diameter: 5/8 in.
These limits can become critical in a high-floor condo, a home where the outdoor unit must be placed far from the wall-mounted indoor unit, or a project requiring several architectural elements to be bypassed.
In a relatively simple installation, we always try to keep the refrigerant route as direct as possible. Each additional detour affects the amount of piping, drainage, the appearance of the line-hide covers, and sometimes the project cost.
Drainage deserves just as much attention as the refrigerant lines
Not all wall-mounted heat pump problems originate in the refrigeration circuit. An improper drain slope can cause water accumulation, overflow, or recurring maintenance issues.
Before installation, we therefore determine:
- the exact position of the indoor unit;
- the piping route;
- the condensate drain outlet;
- the available slope;
- the outdoor unit’s position;
- the required electrical supply.
When gravity drainage is not possible, a condensate pump may be necessary. However, we prefer natural drainage whenever the building configuration allows it, since this reduces the number of mechanical components requiring maintenance.
Compact outdoor unit: 33 × 21 × 12.5 in
The outdoor unit DHP12CSB11S measures approximately 33 in × 21 in × 12.5 in, or 848 × 540 × 320 mm. Its stated sound pressure level is 53 dB(A). YORK also indicates a factory refrigerant charge of 31.74 oz, or approximately 0.9 kg.
These dimensions make it easier to integrate the unit on certain balconies, wall brackets, or side locations, but installation compliance always depends on the manufacturer’s clearances and the rules applicable to the building.
In Greater Montreal, the constraints are not the same for a bungalow on the South Shore, a Montreal duplex, a Laval condo, or a townhouse in Longueuil. The best location depends as much on service accessibility as on aesthetics and the surrounding area.
An example of a situation where this 115 V YORK unit may be suitable
A scenario we regularly encounter during our estimates involves a homeowner who wants to cool and heat a main living area of approximately one zone, but does not want to unnecessarily modify the electrical installation.
For this type of project, a 12,000 BTU 115 V heat pump may be a good option if the calculated heat load actually matches this capacity.
We then check several factors before recommending the model:
insulation and sun exposure, the room’s area and volume, the number of windows, airflow to adjacent rooms, existing heating, electrical panel capacity, and the outdoor unit’s location.
This approach avoids a common mistake: automatically choosing 12,000 BTU solely because the area seems to match a chart found online.
Two homes of the same size can have very different heating loads.
When we would instead direct the customer toward another heat pump
The YORK P Series 12,000 BTU 115 V is not intended for every project.
We would consider a different solution when a customer is primarily looking for:
an ENERGY STAR Cold Climate-certified heat pump, documented performance at -25 °C or -30 °C, eligibility for a current subsidy based on a list of qualified equipment, a next-generation refrigerant, or significantly higher seasonal efficiency.
The AirGreen product sheet for this model currently indicates ENERGY STAR: No, ENERGY STAR Cold Climate: No, and no provincial LogisVert subsidy associated with the product.
This YORK should therefore be considered for what it is: a 115 V Inverter wall-mounted heat pump from an earlier generation, offering an interesting solution for certain targeted projects, but it should not be presented as equivalent to a latest-generation ultra-low-temperature heat pump.
This transparency helps a homeowner make a good decision far more than a comparison based solely on price or the number of BTUs.
Warranty: check the registration terms
Our AirGreen product sheet lists a warranty of 10 years on the compressor, 10 years on parts, and no manufacturer labor warranty indicated in this format.
The 2020 YORK brochure does, however, provide an important clarification: it presented a standard warranty of 7 years on the compressor and 5 years on parts, extended to 10 years on the compressor and 10 years on parts after online registration for eligible residential installations. Labor coverage was presented separately as a paid option.
For this reason, we always recommend confirming the terms applicable to the serial number of the product actually sold and completing the required registration after installation. The conditions in a brochure published several years ago should not automatically be assumed to be identical to those of the product sold today.
Three errors we seek to avoid with this type of installation
The first is to consider the 115 V as permission to connect the heat pump to any existing circuit. With an MCA of 20 A and an MOCP of 30 A, the electrical design must be done correctly.
The second is installing the indoor unit without considering the airflow direction. Even with vertical and horizontal swing, a head aimed directly at a bed or work table can become uncomfortable.
The third is choosing capacity based solely on floor area. A proper wall-mounted heat pump installation considers the building as a whole: insulation, windows, orientation, ceiling height, open rooms, and winter heating needs.
YORK P Series Maintenance
Like any wall-mounted heat pump, this YORK unit must maintain a clean heat exchanger and sufficient airflow.
The homeowner can periodically clean the accessible filters of the indoor unit. When the blower wheel, evaporator, or drain pan accumulates dust or deposits, deep cleaning of a wall-mounted heat pump becomes advisable.
Reduced airflow, a persistent odor, water flowing indoors, or a significant change in performance are signs that warrant an inspection.
The outdoor unit must also have sufficient clearance around its heat exchanger. In winter, snow or ice buildup around the outdoor unit can restrict airflow and compromise operation.
Is the YORK P Series 12,000 BTU 115 V still a suitable choice?
It can be when the building’s characteristics precisely match its strengths.
The 115 V power supply, relatively common 1/4 in - 3/8 in piping, compact format, Inverter modulation, heating operation down to -20 °C, and motorized louvers on both axes make it a practical solution for certain residential or light commercial projects.
However, homeowners who prioritize heating in extreme cold or available rebates should compare this unit with newer generations before making a decision.
At AirGreen, our job is precisely to make this comparison before installation, not afterward.
Why have AirGreen assess the project
We install and maintain HVAC systems throughout Greater Montreal, including Montreal, Laval, Longueuil, Boucherville, the South Shore, and the North Shore.
During an assessment, we can verify the capacity actually required, the electrical configuration, the piping route, drainage, the outdoor unit’s location, and whether investing in this model rather than a newer heat pump makes sense.
The goal is not to automatically sell the equipment with the most impressive specifications. We seek an installation that is appropriate for the building, budget, and intended use.
FAQ – YORK P Series 12,000 BTU 115 V
What is the outdoor model number?
The outdoor unit is the YORK DHP12CSB11S.
What is the indoor model number?
The indoor wall-mounted unit is the DHP12NWB11S.
What is the cooling capacity?
The rated capacity is 12,000 BTU/h, with an advertised modulating range of 3,753 to 12,500 BTU/h.
What is the heating capacity?
The rated capacity is 13,000 BTU/h, with a range of 3,412 to 15,013 BTU/h under the conditions specified by YORK.
Down to what outdoor temperature can it provide heating?
The published heating operating range extends down to -20 °C.
Does it operate at 115 V?
Yes. It operates at 115 V, single-phase, 60 Hz. This does not eliminate the need to provide an electrical circuit that complies with the unit’s requirements.
What piping does it use?
The refrigerant piping is 1/4 in. for liquid and 3/8 in. for gas.
What piping length can be installed?
The documentation indicates up to 65 ft of total length, with a maximum height difference of 33 ft.
Is Wi-Fi included?
Wi-Fi is optional and requires the CS532AH adapter.
Do the louvers move automatically horizontally and vertically?
Yes. YORK’s P Series function table lists automatic vertical and horizontal swing, as well as up/down and left/right movement functions.
Is it ENERGY STAR Cold Climate?
The AirGreen product page indicates No.
Is it eligible for LogisVert?
The AirGreen product page currently lists no LogisVert rebate for this configuration. If the rebate is important for your project, we recommend comparing it with eligible heat pumps available at the time of purchase.
Request an AirGreen estimate
Are you considering the YORK P Series 12,000 BTU 115 V, or would you like to know whether a newer heat pump would be better suited to your property? Contact AirGreen for an estimate and an analysis of your HVAC system in Montréal, Laval, Longueuil, the North Shore, or the South Shore. We can check the capacity, electrical supply, positioning, and available options before you commit to the work.