Air to Water Heat Pump Retrofit

by | Apr 22, 2016 | Projects~res, Residential

Project type: Air to Water Heat Pump Retrofit and Upgrade

This building was a Montessori school until it became the new home of the Nanaimo Community Hospice Society. The NCHS converted it for use as offices, training, and counselling spaces.

The existing electric boiler was very expensive to operate, and there was no cooling in the building.  Stage 3 Renewables designed and installed a new heating and cooling system that will cut the energy bills dramatically and provide comfortable temperatures throughout the year.


  • Nordic Air to Water heat pump: The heart of the new mechanical system – this Canadian made heat pump heats and cools the building. It’s designed for cold climates, so it’s still highly efficient below 0˚C.  The Nordic ATW series come with their new GEN2 control board:  BACnet integration, data-logging, custom control and a data rich interface set this unit apart.   Advanced defrost logic eliminates inefficient cycling, and the PWM fan is whisper quiet as it adjusts to the load.  Download Brochure
  • Advanced Building Controller:  The Tekmar 406 Heat Pump building controller intelligently coordinates this complex system. It utilizes outdoor reset to supply different water temperatures to the radiant floors, baseboards, and fan coils.  During floor cooling operation, it uses humidity sensors and a variable speed injection pump to prevent floor condensation. This maximizes floor cooling potential during changing building conditions
  • Networked Thermostats: The Tekmar tN2 programmable thermostats save energy and precisely control temperature.  They communicate and share a setback schedule based on occupancy. Intelligent recovery ensures each zone is at the right temperature when people arrive in the morning.  The adjustment band has been limited to prevent visitors from causing control issues.
  • Hydronic Fan Coil Units:  Multiaqua wall mounted fan coils provide supplemental heating and cooling.  Their attractive design and quiet operation blend into the space nicely.
  • Radiant Floor Cooling: The floors throughout the building can now do radiant base load floor cooling. It’s a silent, low-energy way to keep temperatures under control during warm weather.  During floor cooling operation, the building controller uses humidity sensors and a variable speed injection pump to prevent floor condensation. This maximizes floor cooling capacity as building conditions change.
  • Additional Zoning: During the renovation, the large open classrooms were divided up into smaller counselling offices, training rooms, and treatment spaces.  The new floorplan required better temperature control, so we added temperature zones, actuators, and balancing.

This retrofit application of an Air to Water heat pump was a good design challenge.  Stage 3 Renewables provided a complete mechanical package that is reliable and easy to operate. The new equipment integrated seamlessly into the building, and we were able to keep costs down by repurposing most of the existing distribution.  The non-profit client now has comfortable spaces to do their important work, and their future heating bills will be much more affordable.

Stage 3 Renewables installs air to water heat pumps throughout Greater Vancouver, Fraser Valley, Sunshine Coast, Vancouver Island, and the Gulf Islands. New build or retrofit, we can make it happen professionally and affordably.


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What We Do

Stage 3 Renewables is an innovative renewable energy company with an excellent reputation.

Our services include:

  • Design and installation of heating and cooling systems
  • Energy modelling and pre-feasibility studies
  • Engineering design and documentation
  • Troubleshooting and repair of mechanical systems - we're the best!
  • New construction and conversions to Renewables
We provide design and installation services for Residential and Commercial clients. We retrofit energy efficient systems and we interface with boilers and heat pump systems. We know how to save energy, lower heating bills, improve reliability and increase comfort. If you want the best performance and value, give us a call first.

Where We Work

Stage 3 Renewables is a British Columbia renewable energy company. We work throughout Coastal BC in places like,
Greater Vancouver: Richmond, Burnaby, Delta, Surrey, Ladner, North Vancouver, White Rock, West Vancouver
The Fraser Valley: Langley, Abbotsford, Chilliwack, Hope, Mission,
North Fraser River: New Westminster, Port Coquitlam, Port Moody, Mission
Sunshine Coast: Gibsons, Sechelt, Roberts Creek, Powell River
Vancouver Island: Victoria, Sooke, Duncan, Nanaimo, Parksville, Qualicum, Courtenay, Comox
Gulf Islands: Salt Spring Island, Galiano, Mayne, Quadra
We bring Renewable Energy solutions to you! Call us today about your project.