📖 Homeowner Education Guide
Everything You Need to Know
About Buying New Windows
Researched for Southern Ontario homeowners. We cover window types, energy ratings, glass packages, frame materials, and exactly what to look for — so you can buy with confidence.
How to Know
Signs Your Windows Need Replacing
Most windows last 20–25 years. If you're seeing any of these, it's time to act — old windows can cost $800–$2,000/year in excess energy bills.
Drafts near the frame
You feel cold air around the edges even with windows closed. Air seals fail over time, letting cold air infiltrate.
Condensation between panes
Fog or moisture trapped between the layers of glass means the insulated seal has failed — the gas fill is long gone.
Cold glass surface in winter
Touch the interior glass. If it feels very cold, the window is transferring outdoor temperatures directly into your room.
Street noise comes right through
Modern double or triple pane windows significantly reduce outdoor noise. If you can hear street sounds clearly, it's time to upgrade.
Hard to open or close
Warped frames, broken mechanisms, or failed balances make windows difficult to operate — a safety hazard in emergencies.
Rotting or peeling frames
Wood frames rot, paint peels, and caulking cracks. Past a certain point, repairs cost more than replacement.
Uneven room temperatures
One room is always too cold in winter or too hot in summer. Usually a sign that the window is allowing heat transfer.
Single-pane glass
If your home is older than 35 years and hasn't been updated, you may have single-pane windows which are 3–5× less efficient than modern units.
Window Styles
Which Window Type is Right for You?
Each window style has different strengths. Click any card to learn more about how it operates, ventilation performance, and best use cases.
Casement
Hinged on the side, cranks outward. Best ventilation of any window style — catches cross-breezes.
Double-Hung
Both sashes slide up and down. Easy to clean from inside. The most common window in North American homes.
Awning
Hinged at the top, opens outward from the bottom. Great for ventilation even during light rain.
Sliding
One sash slides horizontally past the other. Ideal for wide openings and contemporary designs.
Fixed / Picture
Doesn't open at all — purely for light and views. Most energy-efficient type since there are no operable seals.
Tilt & Turn
European-style. Tilts inward at top for ventilation, or swings fully inward like a door. Premium two-in-one operation.
Glass & Insulation
Understanding Glass Packages
The glass package (IGU — Insulated Glass Unit) is the most important factor in a window's thermal performance. Here's exactly what each layer does.
⚠️ Single Pane Glass
Almost no insulation. Found in homes built before 1990. If you have these, you're heating the outdoors.
U-Factor~5.8
R-Value~0.9
Sound ReductionPoor
Energy Star?❌ No
⚡ Replacing single-pane with triple-pane can reduce heating costs by up to 50%.
✅ Double Pane (IGU)
The standard for Ontario homes. Two layers of glass with an insulating gas-filled space in between. Meets Energy Star requirements.
U-Factor~1.6–2.0
R-Value~3.0–3.5
Sound ReductionGood
Energy Star?✅ Yes
💡 For most Ontario homeowners replacing old windows, double pane with Low-E + Argon delivers excellent value and comfort.
⭐ Triple Pane (HGU)
Three glass layers, two gas-filled spaces. Up to 50% more efficient than double pane. Virtually eliminating cold-glass condensation in our winters.
U-Factor~0.8–1.2
R-Value~5.0–7.0
Sound ReductionExcellent
Greener Homes Rebate?✅ Up to $5K
🏆 Recommended for north-facing windows, large windows, rooms above garages, or anyone on a noisy street. Pays back in 4–7 years.
Understanding Ratings
Energy Performance Metrics Explained
Window energy labels can be confusing. Here's exactly what each number means — and what to look for in Ontario.
📊 Quick Reference: Low-E Coatings & Gas Fill
Low-E Glass (Low-Emissivity)
A microscopically thin metallic coating on the glass surface. Reflects heat back into the room in winter and blocks solar heat in summer. Always choose Low-E. The cost difference is minimal; the performance gain is significant.
Gas Fill: Argon vs. Krypton
Argon: Standard. ~65% more insulating than air. Great for double-pane. Cost-effective.
Krypton: Premium. ~85–95% more insulating than air. Smaller molecules mean it works better in the thinner gaps of triple-pane units. Use Krypton in triple-pane.
Krypton: Premium. ~85–95% more insulating than air. Smaller molecules mean it works better in the thinner gaps of triple-pane units. Use Krypton in triple-pane.
Frame Options
Frame Materials Compared
The frame affects energy performance, maintenance, durability, and aesthetics. Here's an honest comparison.
| Material | Energy Efficiency | Durability | Maintenance | Best For | Azorvia Verdict |
|---|---|---|---|---|---|
| Aluminum (Thermal Break) |
Very Good Thermal break stops cold transfer |
Excellent Lasts 40–50+ years |
Minimal Never rots or warps |
Large windows, commercial, contemporary homes | ✅ Our Specialty |
| Vinyl (uPVC) | Excellent Natural insulator |
Good May fade/warp over time |
Low | Budget-conscious upgrades, standard sizes | Good all-rounder |
| Fiberglass | Excellent Same expansion rate as glass |
Excellent Won't warp, rot, or corrode |
Very Low | Premium homes, harsh-exposure locations | Premium alternative |
| Wood | Good Natural insulator but seals age |
Poor Rots, warps, needs painting |
High Repaint every 2–5 years |
Heritage homes, interior-only aesthetic | ⚠️ Not recommended |
| Aluminum (No Thermal Break) |
Poor Direct cold transfer |
Excellent | Minimal | Southern climates only | ❌ Not for Ontario |
Southern Ontario Specific
What Azorvia Recommends for Ontario Homes
Southern Ontario presents unique challenges — brutal winters down to -25°C, humid summers up to +35°C, and significant freeze-thaw cycling. Here's what we recommend based on real performance data.
−25°C
Winter low temperatures Ontario regularly sees
~4,000
Heating Degree Days (Toronto) per year
ER 34+
Minimum Energy Star rating for Ontario
$5,000
Max rebate via Canada Greener Homes for triple-pane
Our Azorvia Standard Specification
When building a quote for a Southern Ontario home, this is the baseline configuration we recommend for best value and energy performance.
Glass Package
Triple Pane (HGU)
Best suited for Ontario winters. Qualifies for Greener Homes rebate. ~50% more efficient than double.
Low-E Coating
Always Included ✓
Non-negotiable in our climate. Reflects interior heat back in winter. Blocks summer solar heat.
Gas Fill
Krypton (for triple)
Krypton's smaller molecules are 50% more insulating than Argon in triple-pane's thinner gaps.
Frame
Aluminum w/ Thermal Break
Durable for 40+ years. The thermal break eliminates cold-frame condensation issues. Our specialty.
U-Factor Target
≤ 1.2 W/m²K
Exceeds Energy Star requirements. Prevents heat loss even on the coldest Ontario nights.
SHGC (South-facing)
0.45 – 0.55
Balances passive solar heating in winter with comfort in summer. Higher than west/east-facing.
Common Questions
Frequently Asked Questions
Is triple pane always better than double pane? ▼
For Southern Ontario: yes, in most cases. Triple pane has better thermal resistance (R-5 to R-7 vs R-3 to R-3.5), better sound reduction, and less condensation. The payback is typically 4–7 years through energy savings. However, for window openings that get minimal sun and aren't in cold rooms (e.g., a small bathroom window under an overhang), high-quality double pane is perfectly fine.
How long do new windows last? ▼
Quality aluminum-framed windows last 40–50+ years. The glass unit (IGU) typically carries a 20-year seal warranty. Vinyl windows last 20–30 years. The oldest failure point is the gas-filled seal — once moisture enters, the glass insulation value drops significantly. Look for manufacturers offering at least 20-year sealed unit warranties.
Can I qualify for government rebates on new windows? ▼
Yes! The Canada Greener Homes Grant offers up to $5,000 for windows that meet Energy Star Most Efficient criteria (ER 40+, triple pane). You'll need a pre- and post-installation EnerGuide assessment. The Home Renovation Savings Program (Ontario) may also apply. We help all our customers identify applicable rebates — ask us during your quote consultation.
What's the difference between retrofit and new construction windows? ▼
Retrofit (Insert): The new window slides into the existing frame without removing interior or exterior trim. Less disruption, lower cost. Best for frames in good condition. This is what most homeowners choose.
New Construction (Full Frame): Everything comes out — old window, frame, trim. Higher cost but allows complete insulation and framing inspection. Best when the existing frame is rotted, out of square, or you're adding a new opening.
New Construction (Full Frame): Everything comes out — old window, frame, trim. Higher cost but allows complete insulation and framing inspection. Best when the existing frame is rotted, out of square, or you're adding a new opening.
Why is aluminum better than vinyl for large windows? ▼
Aluminum is structurally much stronger than vinyl, which means frames can be made thinner for larger spans — giving you more glass area and better views. This is why virtually all commercial buildings use aluminum. For residential large-format windows (picture windows, floor-to-ceiling glass), aluminum handles the structural load without bowing. Vinyl can flex and warp with temperature extremes over time in large sizes.
How do I know if I have condensation problems? ▼
Condensation on the inside surface of your window on cold days doesn't necessarily mean your window is failing — it means your indoor humidity is high relative to the glass temperature. Solution: triple pane (warmer glass surface) or reduce indoor humidity.
Condensation between the panes (only visible from the outside when dry) means the sealed unit has failed and must be replaced regardless of the frame condition.
Condensation between the panes (only visible from the outside when dry) means the sealed unit has failed and must be replaced regardless of the frame condition.
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