10/31/2026
Net-zero envelope spec on paper, heat pump ordered before the blower-door test — that sequencing mistake costs builders more than the unit itself.
We ship around 60–70 heating units a year to Atlantic Canada builders. The callbacks we hear about most aren't equipment failures. They're sizing errors baked in before the slab was poured.
Here is the sequence we walk builders through before they reserve a VY-23S:
1. Confirm the envelope spec first. The VY-23S is rated at 23,000 Btu/h cooling and 25,000 Btu/h heating. That rated capacity is the ceiling for a tight, well-insulated assembly — not a number that holds for a leaky 1970s bungalow with 2×4 walls.
2. Run the heat loss calculation against the actual wall assembly, not the architect's target. A building that tests at 3.0 ACH50 needs a different answer than one at 0.6.
3. Check the −15 °C output, not the rated capacity. The VY-23S delivers 18,600 Btu/h at −15 °C. That is the number that matters on a PEI February night.
4. Confirm the refrigerant. This unit runs R-454B (GWP 466). Older refrigerant lines in a retrofit may need attention before commissioning.
https://vybuild.ca/product/23000-btu-mini-split-heat-pump-seer2-23-standard/?utm_source=facebook&utm_medium=social&utm_campaign=organic_2026-10&utm_content=712265a1