Aluminum vs. Fiberglass vs. Wood Windows: Which Is Best for Idaho’s Climate?

When you live in Idaho — or anywhere with snowy winters, hot summers, and everything in between — choosing the right window material isn’t just about looks. The material you select impacts energy efficiency, comfort, maintenance, and long-term performance.

At Steelsen Windows & Doors, one of the most common questions we hear is: “What’s the best material for my new windows?” To help, we’ve created this detailed comparison between aluminum, fiberglass, and wood windows so you can confidently select the option that fits your home, lifestyle, and budget.

What to Consider When Choosing Window Material

Before diving into the details, here are the top performance criteria for Idaho homes:

• Energy efficiency & insulation (U-factor, SHGC, and thermal breaks)

• Durability & lifespan (resistance to warping, cracking, or rot)

• Maintenance (how often you’ll need to repaint, reseal, or refinish)

• Design flexibility (style, color, and finish options)

• Cost & value over time

Aluminum Windows

• Strengths:

  • Exceptional structural strength → allows for slim, modern profiles and expansive glass walls.

  • Low maintenance, weather resistant.

  • Wide range of finishes (powder-coated, anodized).

• Considerations:

  • Historically weaker on thermal performance, but modern thermal break technology makes them highly efficient.

  • Potential condensation if not properly insulated.

• Best for: Contemporary homes seeking minimal sightlines, commercial projects, and large custom openings like lift-and-slide doors.

Fiberglass Windows

• Strengths:

  • Superior thermal insulation, low expansion/contraction.

  • Extremely durable and resistant to warping or rotting.

  • Can mimic wood textures while keeping maintenance low.

• Considerations:

  • Typically more expensive than vinyl or standard aluminum.

  • Limited color options compared to aluminum.

• Best for: Homeowners wanting a balance of performance and low upkeep — ideal for cold climates and long-term durability.

Wood (and Aluminum-Clad Wood) Windows

• Strengths:

  • Natural beauty and timeless aesthetic.

  • Excellent insulator, warm interior feel.

  • Aluminum-clad options protect exterior while keeping interior wood exposed.

• Considerations:

  • Highest maintenance (painting, sealing).

  • Susceptible to moisture unless clad.

• Best for: Traditional or luxury homes where aesthetic and authenticity are priorities.

Feature	Aluminum	Fiberglass	Wood / Clad
Energy Efficiency	★★★★☆ (with thermal breaks)	★★★★★	★★★★☆
Durability	★★★★★	★★★★★	★★★ (higher with cladding)
Maintenance	Low	Very Low	High
Aesthetic Flexibility	Modern, sleek	Neutral, versatile	Classic, warm
Cost Range	$$–$$$	$$–$$$	$$$–$$$$

There’s no one-size-fits-all answer — the “best” material depends on your design goals, budget, and climate needs. For modern Idaho homes, aluminum and fiberglass often outperform others in efficiency and durability, while wood and clad-wood provide unbeatable warmth and luxury.

Explore our Window Collections or schedule a consultation with our team to see real samples and performance data.