In façade and window design, the choice of glazing is central. Architects and clients often weigh thermal performance, cost, installation complexity, and weight. Below is a side-by-side comparison between HaanGlas VIG (Vacuum Insulating Glass) and conventional IGUs (double- or triple-glazed units).
Thermal Performance
One of the strongest selling points of VIG is its superior insulation in a thinner form. HaanGlas’s product literature states that VIG units can reach U-values as low as ~0.47 W/m²·K in compact configurations. (See the HaanGlas “Vacuum Glazing Solutions – PRO / BASIC” )
In contrast, many standard double glazing units (with argon fill, low-E coatings) have U-values in the range of ~1.1 to 1.5 W/m²·K. Triple glazing might reach 0.8–1.0 W/m²·K, but at increased thickness and weight.
Because of the extremely narrow vacuum gap (0.1–0.3 mm) and elimination of convective heat transfer, VIG is able to outperform larger, heavier IGUs in equivalent envelope settings.
This improvement translates to real energy savings, reduced HVAC loads, and better performance in extreme climates. For more on energy performance, see our Energy Actions / Carbon Reduction and Retrofitting with Energy-Efficient Vacuum Glazing pages.
Cost (Material & Lifecycle)
From a raw materials standpoint, VIG is more complex to manufacture. The precise vacuum sealing, micro-pillars, low-temperature metal edge sealing, and quality control all demand higher initial cost per square meter versus standard IGUs.
However, vacuum glazing lifecycle cost is where VIG shines:
Energy savings over 20–30 years often offset the premium.
Reduced HVAC and structural load demands may save on supporting systems.
Reduced frame/structural modifications (since VIG is thinner) may cut project costs.
A case in point: HaanGlas has produced oversized VIG panels (e.g. 1524 × 2514 mm tempered VIG) to demonstrate scale capability and cost competitiveness in facades.
In total cost of ownership, VIG can outperform IGUs when accounting for energy, maintenance, and substitution benefits.
Installation Complexity
Standard IGUs are mature technology: fabricators, glaziers, and frame systems are well understood. Installation workflows, sealants, mullion sizing, and tolerance practices are widely established.
In comparison, VIG requires attention to:
Flatness and tolerance control (since vacuum gap is tiny)
Sealing integrity handling (edge protection)
Compatibility with existing frames (thickness, clip systems)
Care in handling to avoid micro-cracks or seal damage
However, HaanGlas has engineered around these challenges. Because VIG is slim, it often fits into existing sashes or frames without redesign (saving time). The lack of heavy weight simplifies handling and shipping despite more delicate sealing constraints.
With proper training and installation protocols (as outlined in our Installation & Maintenance Manual), VIG installation complexity can be comparable to IGUs in many retrofit and façade projects.
Weight
Weight is a key differentiator. VIG units are significantly lighter than triple-glazed IGUs of equivalent performance. Typical VIG panels weigh perhaps 15–20 kg/m², whereas a triple glazed unit might weigh 30–40 kg/m² (or more, depending on glass thicknesses and framing).
Moreover, HaanGlas’s oversized VIG demonstration (6 mm + 0.3 V + 6 mm) panel of 1524 × 2514 mm weighed ~113 kg, achieving ~0.58 W/m²·K and ~80% light transmittance.
This weight advantage reduces demand on frames, mullions, anchors, and shipping logistics. In retrofit scenarios, lighter glazing alleviates load issues on existing window frames or structures.
Summary Table
| Metric | HaanGlas VIG | Conventional IGU (Double / Triple) |
| U-value | ~0.47 W/m²·K (or slightly higher in larger sizes) | ~1.1–1.5 (double), ~0.8–1.0 (triple) |
| Material / Manufacturing Cost | Higher premium | Lower cost, mature production |
| Lifecycle / Energy Savings | Often offsets premium over time | Lower energy gains, less lifetime savings |
| Installation Complexity | Requires tight tolerances, handling care | Familiar workflows, more forgiving tolerances |
| Weight | ~15–20 kg/m² (lighter) | ~25–40+ kg/m² depending on triple layers |
Putting It Into Practice
To choose wisely:
Use VIG in projects where envelope thermal performance is critical and where frame redesign is costly.
Leverage its lightweight benefits in retrofits or where structural load is constrained.
Factor in long-term energy savings and reduced HVAC loads in ROI models.
Ensure installer training and quality assurance for seal and flatness control.
If you’d like detailed comparison charts, cross-sectional drawings, or cost breakdowns, visit our Downloads / Technical Brochures section or request sample data via ourContact HaanGlas page.