Want to lower your energy bills without compromising on design?
Our steel casement windows check every box — strength, beauty, and most importantly, energy efficiency.
Let’s break it all down.
What Makes a Steel Casement Window Energy Efficient?
Understanding Casement Window Mechanics
A casement window opens on hinges on one side, just like a door.
This simple function makes a big difference.
Because they swing outward, the sash pulls tight against the window frame when closed — creating a powerful seal that prevents air from sneaking in or out.
That’s already a step ahead of old-school single-pane windows.
Why Steel Frames Beat the Rest
Wood rots. Aluminum sweats. Vinyl? Warps in heat.
But steel?
Steel stays solid.
We’re talking strength of steel that resists distortion and handles oversized glass like a pro.
That means slender frames, more natural light, and a cleaner aesthetic.
Steel windows offer longevity and low maintenance — no repainting every year. Just decades of high performance.
How Thermally Broken Steel Prevents Heat Loss
What Is a Thermal Break and Why It Matters
Steel is strong — but it’s also a conductor. Without protection, it passes heat and cold right through.
That’s where the thermal break comes in.
We add a non-metallic barrier inside our thermally broken steel frames to stop the transfer of heat.
That’s how we fight heat gain in summer and heat loss in winter — without losing any of that modern look.
Thermally Broken Steel Windows in Action
Our thermally broken systems use:
- Fully welded construction
- Dual weather-stripping
- Insulated glass units
Together, they keep indoor temperatures and reduce energy spikes — meaning less work for your heating and cooling systems.
You’ll see energy savings immediately.
Smart Glazing and Low-E Coatings Explained
Types of Glazing for Maximum Efficiency
Whether you go double pane or triple glazed, the right glazing matters more than you think.
Here’s how it stacks up:
| Glazing Type | U-Value (Lower = Better) | SHGC (Solar Gain) | Best For |
|---|---|---|---|
| Single Pane | 0.90+ | 0.85 | Mild climates |
| Double-Paned | 0.50 | 0.60 | Standard insulation |
| Triple Glazed | 0.20–0.30 | 0.30 | Cold/hot extremes |
More panes = better insulation and less heat transfer.
The Power of Low-E Glass
Low-E (low-emissivity) coatings are thin layers that block infrared and ultraviolet light.
They reflect heat gain in summer and retain warmth in winter. That means fewer spikes in AC or furnace usage and lower energy waste.
And yes — we offer multiple low-e options tailored to your climate.
Comparing Energy-Efficient Steel Window Designs
Single vs Double Casement Options
Got a small space? A single casement window works wonders.
Want a bigger impact? Our double casement units give you more glass and better airflow.
| Type | Hinges | Width Range | Use Case |
|---|---|---|---|
| Single Casement | One side | 18”–42” | Compact areas |
| Double Casement | Both sides | 36”–84” | Large openings |
| French Casement | No center post | 36”–90”+ | Unobstructed views |
Modern Steel Casement Windows for New Construction
Today’s builders are picking modern steel casement windows for one reason: they match form and function.
They’re clean. Minimal. Bold.
Ideal for new construction, historic renovations, and even modernized french doors.
They create seamless indoor and outdoor flow — while cutting down heat loss and ramping up curb appeal.
Real Energy Savings for Every Homeowner
How Our Windows Lower Energy Costs
Every one of our systems is NFRC rated and many meet Energy Star qualifications.
Compared to older metal frames or single panes, our energy-efficient steel windows reduce heating and cooling demand by up to 30%.
That’s serious energy savings.
How We Help Reduce Energy Use
By cutting air leaks and boosting insulation, our windows lower the reliance on heating and cooling — especially during extreme seasons.
Here’s how:
| Old Window Type | Heat Loss | Estimated Savings |
|---|---|---|
| Single-pane aluminum | Very high | Baseline |
| Steel w/o thermal break | High | +10–15% |
| Optimum Thermally Broken Steel | Low | +30% |
Less heat in, less heat out — and less money flying out of your wallet.
Features That Set Optimum Apart
Built to Last with Customization Options
Every unit we make is custom-built and built to last.
Choose from finishes like matte black or go wild with bold colors. All powder-coated for durability, backed by a 10-year warranty.
Looking for fire-rated? Covered.
Need oversized doors and windows? Handled.
Want true divided lites or simulated muntins? Yup.
Windows That Look Good and Work Hard
All our windows are designed with performance and beauty in mind.
Need a metal window that looks right at home in a minimalist build or an industrial loft? Done.
Mix and match with window and door combos for even more flexibility.
From tight city lots to sprawling modern homes, our efficient steel systems fit the vibe — and crush the performance numbers.
Why Homeowners Choose Optimum Steel Casement Windows
Trusted Materials and Craftsmanship
Our windows are made in the U.S. with fully welded, thermally broken steel and insulated glass — built by skilled craftspeople.
With strong hinge systems, snug weather-stripping, and precision-fitted sash, they’re made to last — and designed to perform.
The Advantages of Steel Casement Windows
Here’s the real deal:
- Sleek style with slender steel frames
- Better comfort, less noise
- Fire-rated, energy-smart, and low maintenance
- Maximum airflow when open
- Unmatched durability
The advantages of steel casement windows make them a no-brainer.
They look incredible and cut your energy costs like a pro.
Ready to Upgrade? Let’s Talk Windows and Doors
Whether you’re upgrading an old window or door or building something brand new, we’re here to make it easy.
Let’s customize your next steel casement window project — and help you reduce energy bills while you’re at it.
