Comparison of VST-MB-79N, VST-MB-86N and VST-MB-104 windows — understanding the real thermal and acoustic differences
- cathiest-germain
- 11 hours ago
- 2 min read
VST aluminum windows are designed to offer the perfect balance between European design , durability , and energy performance adapted to the Quebec climate. The VST-MB-79N , VST-MB-86N , and VST-MB-104 models are distinguished primarily by their thermal (Uw) and acoustic (Rw) insulation levels, especially in triple-glazed configurations. Understanding their differences allows you to make an informed choice between performance, comfort, and investment.
VST-MB-79N — Intelligent performance and superior efficiency
The VST-MB-79N is the ideal system for those looking for a high-performance, durable and affordable window . In triple glazing version (up to 44 mm) , it achieves an average Uw of 0.71 W/m²K and an Rw of up to 42 dB , values which already correspond to the recommended requirements for passive houses in Canada .
Its multi-chamber profile and high-efficiency thermal breaks ensure stable interior comfort and a significant reduction in energy losses.
Recommended for: residential projects, renovations and high-performance constructions seeking a “passive” return at a reasonable cost.
VST-MB-86N — The high-performance solution for northern climates
The VST-MB-86N pushes performance further with a Uw of 0.61 W/m²K and an Rw ≈ 45 dB . Its optimized insulation and reinforced structure make it an excellent choice for modern architectural projects or large glazed openings . It far exceeds Energy Star Canada requirements and even surpasses the recommended values for passive houses in Canada , while maintaining an excellent balance between rigidity, design, and insulation.
Recommended for: new constructions or prestigious projects requiring stable performance over several decades.
VST-MB-104 — Maximum excellence, but at what price?
Certified to Passive House (PHI) standards , the VST-MB-104 achieves a record Uw of 0.53 W/m²K and an Rw of up to 46 dB . However, it is about 40% more expensive than the VST-MB-86N , for a real thermal gain of barely 0.08 W/m²K — a measurable difference, but economically marginal for the majority of residential projects.
Some customers still prefer this ultimate option for ecological, technical or aesthetic reasons , but it is not always justified from the point of view of return on investment .
Conclusion — the best balance of performance and value
The VST-MB-79N with triple glazing remains the most relevant choice for 90% of residential projects. With an average Uw of 0.71 W/m²K , it already offers the thermal performance recommended for a passive house in Canada , while maintaining a much more advantageous investment cost .
At VST Euro , we believe that true performance is that which combines efficiency, durability and long-term profitability .
