Choose for the house, then compare the evidence.
For an Ontario renovation or custom home, begin with those decisions, then compare the documented performance of the proposed windows. A material name alone cannot tell you how a particular unit will perform or what the complete project will include.
Compare four frame families fairly.
The U.S. ENERGY STAR framing-material overview describes low-maintenance vinyl and fiberglass frames, thermal breaks in aluminum, and exterior cladding used to reduce wood-window maintenance. These are general distinctions, rather than a ranking of finished products.
| Material | A useful reason to consider it | What to resolve before selecting it |
|---|---|---|
| uPVC / vinyl | A frame family worth considering when reducing routine refinishing is a priority. | Examine the actual frame and sash sections, corner appearance, finish sample and care instructions. Compare the proposed system, rather than treating every vinyl profile as equivalent. |
| Fiberglass | Another low-maintenance frame family, with products using hollow or insulated sections. | Review the specific profile and coating. Establish which finishes are offered, whether later refinishing is permitted, and what the manufacturer requires. |
| Thermally broken aluminum | A metal frame may fit the architectural finish and section geometry you want. | Require documentation of the thermal break and complete-window performance. A metal appearance or slim-looking sample does not establish thermal performance or an allowable opening size. |
| Wood / clad wood | Consider it when the interior wood appearance is part of the design brief. | Identify exposed wood, exterior cladding and finish responsibilities. Cladding can reduce exterior maintenance; it does not remove the need to inspect and care for the assembly. |
For metal frames, the U.S. Department of Energy explains the importance of thermal breaks in limiting conductive heat flow. The break is part of the system to examine, alongside its glazing and seals.
Draw the view before choosing the finish.
Request an elevation showing the actual fixed and opening units together. Mark the visible frame edges, sash divisions and mullions, then compare that drawing with the room’s intended view. A showroom corner sample cannot show the full composition of a grouped opening.
Use section drawings to check how the frame meets the wall, sill and interior trim. Keep opening clearances on the same plan as furniture, taps, blinds and circulation. Before assuming a larger opening or narrower visible frame is available, obtain confirmation for that particular size and operation.
Review physical colour and finish samples beside the exterior and interior materials. Record the exact finish name for each face, corner treatment and applicable care instructions. If future repainting matters, resolve that question for the specified coating before ordering.
Compare the complete window’s evidence.
NRCan’s Keeping the Heat In explains that overall U-factor includes the glass, glass edge and frame. A lower U-factor indicates less heat transfer. A centre-of-glass value leaves out other parts of the window and should not stand in for its complete-system rating.
Solar heat gain coefficient, or SHGC, describes solar heat admitted through the product. NRCan connects its selection to orientation, shading and the home’s heating and cooling circumstances. Use the project’s design brief to choose the glazing; a frame-material preference does not settle that choice.
Put each proposed system’s model, operation, glazing package, rating units and applicable configuration on one comparison sheet. Identify the certified rating basis and any difference between the reference unit and your opening. Keep documentation for air, water and structural performance separate from the energy values, rather than combining everything into a homemade material score. Haven’s performance information provides a starting point for discussing the evidence relevant to a proposed window.
Make care and project scope visible.
Choose a maintenance commitment you will actually follow. Obtain the manufacturer’s cleaning, coating, hardware and seal-care instructions. Read the written warranty alongside those obligations, including exclusions and the procedure for reporting a problem. Frame upkeep is one part of caring for the seals, finishes and any moving hardware. Use Haven’s durability and warranty context to prepare the relevant questions for its proposed system.
For a renovation, establish whether the quotation retains the existing frame or removes it. NRCan distinguishes insert replacement from a complete tear-out, which removes the old frame and permits work at the rough opening. That difference belongs in the quotation before comparing totals.
List responsibility for removal, perimeter insulation and air sealing, flashing, interior trim, exterior making-good and disposal. Mark exclusions and unresolved site conditions explicitly. Two material quotations are difficult to compare if one includes a substantially different installation scope. Review quotation scope using the same opening schedule, finish choices and responsibilities.
Build a shortlist you can approve.
Before selecting the package, have these five items together:
- An opening schedule identifying dimensions, fixed or opening operation and drawing revision.
- Elevations and sections showing sightlines, divisions and wall connections.
- Physical finish samples with approved cleaning and refinishing instructions.
- Complete-window performance documents for the proposed system and configuration.
- A written quotation defining product, site-work responsibilities, exclusions and warranty terms.
Source documents
Use the document for the proposed system and configuration when confirming a specification.
- U.S. ENERGY STAR: Frame materials
General frame-family characteristics; no Canadian qualification rule or model-specific rating.
- U.S. Department of Energy: Residential windows
Why metal frames use thermal breaks; no U.S. procurement thresholds applied.
- NRCan: Keeping the Heat In (Canada.ca)
Whole-window energy concepts and replacement scope; no project-specific installation design.
Your next step
Bring the drawings and the comparison sheet.
Bring that brief to Haven’s window-system discussion. Confirm the offered material, configuration and finish in the actual proposal, then judge how well that specific package meets the house’s requirements.