EXINDA Aura 18,000 Btu/h Vertical Stack Heat Pump ERV (HPERV)
VERTICAL-STACK HEATING, COOLING AND ENERGY RECOVERY VENTILATION
EXINDA AURA Vertical Stack is a 60 Hz all-in-one heat pump ERV for apartments, multifamily buildings and multi-room applications where a ceiling-mounted unit is not feasible. One indoor cabinet provides heating, cooling and 42–135 CFM balanced energy-recovery ventilation without a conventional outdoor condensing unit for each dwelling.
Is this the right vertical-stack HPERV?
- Loads fit the verified capacity at the project design temperatures.
- Corridor-wall access, two exterior air paths and indoor ducts can be coordinated.
- Structural support for 325 lb, 4 kW auxiliary heat and condensate routing are accounted for.
Do not use the 620 CFM heat-pump outdoor-air value as the fresh-air ventilation rate.
Core Specifications
| System type | Vertical-stack all-in-one heat pump energy recovery ventilator |
| Rated cooling | 18,000 Btu/h; EER 9.5 at 95°F outdoor / 80°F indoor rating conditions |
| Heating capacity | 20,000 Btu/h at 47°F; 15,000 Btu/h at 23°F; 9,000 Btu/h at 5°F |
| Heating COP | 3.08 at 47°F; 2.38 at 23°F; 1.76 at 5°F |
| Balanced ERV airflow | 42–135 CFM; 135 / 90 / 42 CFM high / medium / low |
| Indoor supply airflow | 610 CFM cooling / 715 CFM heating at 0.36 in. w.g. |
| Maximum indoor ESP | 0.50 in. w.g. (125 Pa), combined supply and return duct losses |
| Heat-pump outdoor air circuit | 620 CFM at 0.60 in. w.g.; not the balanced ventilation rate |
| Power supply | 208–230 V / 60 Hz / 1 Ph, hardwired |
| MCA / MOP | 35 A / 40 A |
| Auxiliary heat / max input | Up to 4 kW / 6,000 W |
| Compressor / refrigerant | BLDC twin-rotary inverter / R32 A2L, 3.0 lb charge |
| Operating range | Compressor 5 to 109°F; auxiliary heat −31 to 109°F |
| Sound pressure | 50 dB(A) at 1 m; 45 dB(A) at 3 m |
| Filters / ERV core | MERV 13 indoor; MERV 4 return and condenser; cross-flow heat exchanger |
| Dimensions / weight | 34.6 × 13.8 × 82.7 in. / 325 lb |
Heating, Cooling and Ventilation Performance
The heat-pump outdoor circuit and balanced ERV circuit are separate air systems.
| Operating point | Capacity | Input / efficiency | Condition |
|---|---|---|---|
| Cooling | 18,000 Btu/h | 1,900 W; EER 9.5 | 95°F outdoor / 80°F indoor |
| Heating | 20,000 Btu/h | 1,900 W; COP 3.08 | 47°F outdoor |
| Low-temperature heating | 15,000 Btu/h | 1,850 W; COP 2.38 | 23°F outdoor |
| Minimum compressor condition | 9,000 Btu/h | 1,500 W; COP 1.76 | 5°F outdoor |
| ERV-only heating test | 42 / 91 / 135 CFM | 86% / 73% / 65% SRE | 32°F inlet supply |
Source: EXINDA AURA 18K Vertical HPERV submittal, 2026-08-04.
Technical Documents
Questions Before You Specify
Is 620 CFM the fresh-air ventilation rate?
No. It is the outdoor airflow for the heat-pump circuit. The balanced ERV ventilation range is 42–135 CFM.
What happens below 5°F?
The compressor is disabled at and below 5°F. Up to 4 kW electric auxiliary heat remains, so the design-load calculation must confirm whether it is sufficient.
How is this different from the ceiling-ducted AURA?
The vertical-stack cabinet is for corridor-wall or vertical service arrangements. Capacity, duct routing, access, dimensions and structural load are different.
What static pressure is available?
Rated indoor airflow is stated at 0.36 in. w.g., with up to 0.50 in. w.g. maximum indoor ESP. The outdoor heat-pump circuit is rated at 0.60 in. w.g.
What should an enquiry include?
Provide room loads, design temperatures, ventilation airflow, duct static pressure, service space, electrical supply, condensate route, quantity and schedule.
Request selection support or a quote
For the 18,000 Btu/h Vertical Stack HPERV, provide zone loads, design temperatures, balanced ventilation airflow and duct static pressure.
Also include wall/service space, structural support for 325 lb, 208–230 V electrical capacity, 4 kW auxiliary heat, condensate route, quantity and schedule.