Navien Dual-Fuel HVAC System
NAZ Heat Pump + NPF Hydro-Furnace + NAM Cased Coil
Electric efficiency when the weather is mild. Gas power when Calgary temperatures plummet to -30°C. The NAZ + NPF dual-fuel system automatically switches between energy sources — giving you the best of both worlds, year-round.
Why Dual-Fuel Is the Smart Choice for Calgary
Alberta’s climate is uniquely challenging for HVAC systems. Summers can hit 35°C. Winters regularly drop below -30°C. A single heat pump or single furnace can’t efficiently handle both extremes.
The dual-fuel system solves this perfectly:
- Spring & Fall: NAZ heat pump runs efficiently — electricity is cheaper and cleaner than gas at mild temperatures
- Summer: NAZ provides high-efficiency AC cooling up to 19.5 SEER2
- Cold Winter Days: NAZ continues heating down to -20°C, saving on gas bills
- Extreme Cold (-20°C and below): NPF Hydro-Furnace automatically takes over, delivering 97% AFUE gas heat — no manual switching required
The result: lower annual energy costs, maximum comfort in all seasons, and the reliability of a gas backup for Alberta’s coldest days.
The Three Components
NAZ Air-to-Air Heat Pump (Outdoor)
Heats and cools. Operates in heating mode from -20°C to 23.9°C. Up to 19.5 SEER2 cooling, 9.3 HSPF2 heating. Bluetooth module included.
NAM Cased Coil (Indoor Bridge)
Sits on top of the NPF furnace. AHRI-matched with the NAZ. Factory TXV, A2L sensor, multi-position — ideal for dual-fuel retrofits.
NPF Hydro-Furnace (Gas Backup)
97% AFUE gas heating kicks in automatically when needed. Variable capacity 15–100%, hydronic combustion, lifetime heat exchanger warranty.
Dual-Fuel Performance Data (AHRI Certified)
| Capacity | ODU | Furnace | Coil | Cooling (BTU/h) | Heating (BTU/h) | SEER2 | HSPF2 |
|---|---|---|---|---|---|---|---|
| 2 Ton | NAZ-17V36 | NPF700-060U3BH | NAM24B | 22,800 | 24,800 | 16.60 | 8.75 |
| 3 Ton | NAZ-17V36 | NPF700-060U3BH | NAM36B | 33,000 | 35,400 | 16.00 | 8.55 |
| 4 Ton | NAZ-17V60 | NPF700-100U5CH | NAM48C | 46,500 | 47,500 | 15.40 | 9.30 |
| 5 Ton | NAZ-17V60 | NPF700-100U5CH | NAM59C | 55,500 | 55,500 | 15.40 | 9.10 |
Performance data AHRI certified. Subject to change — visit ahridirectory.org for latest. Upflow configurations shown; downflow and horizontal also available.
Get a Dual-Fuel System Quote
The NAZ + NPF dual-fuel system is one of our most popular installs for Calgary homeowners who want year-round efficiency without compromising on winter performance. Contact ER Plumbing & Heating for a full quote.
- Heat load and cooling load assessment
- Dual-fuel thermostat configuration
- Gas supply and venting for NPF
- All three components supplied and installed
Looking for AC only? See the Complete Cooling System or All-Electric Heat Pump System.