Frame material, glass package, and installation quality decide how a window performs in our hot-summer, cold-snap climate. Here's how we walk homeowners through the choices — and the numbers on the label that actually matter.
| Material | Strengths | Trade-offs | Best for |
|---|---|---|---|
| Vinyl | Lowest cost, low maintenance, solid performance | Can't be painted; wider frames | Value-focused whole-house replacement |
| Fiberglass | Barely expands/contracts — seals stay tight; paintable; slim | Mid-high price | Long ownership horizons |
| Composite (e.g., Andersen Fibrex) | Wood-like look, ~2× vinyl's strength, stable | Mid price | Wood look without wood upkeep |
| Wood-clad | Real wood interior, protected exterior | Premium price | Historic & high-end homes |
Brands homeowners ask us about — Andersen, Pella, Marvin, ProVia, Simonton — each ladder from value lines to premium. We install across the major brands and match the tier to your home and horizon; a quality mid-tier window installed well beats a premium window installed poorly, every time.
U-factor is how fast heat escapes — lower is better, and in our mixed climate it's the number to buy first. Look for 0.30 or lower; ENERGY STAR's current criteria for our zone is 0.25. SHGC is how much solar heat comes through — around 0.40 or below balances free winter sun against July heat gain. Low-E coatings reflect radiant heat and argon gas slows transfer between panes; both are standard on quality windows now.
Fiberglass is the all-arounder — no dents, rust, or rot, good insulation, convincing wood grain. Steel costs less and feels secure, but shows dents and can rust once scratched. Real wood is the statement choice, if you'll commit to refinishing it every year or two. Patio doors follow the same materials logic — and sliding vs. French is a space question more than a performance one.
Often, yes — fiberglass barely expands or contracts with temperature swings, so seals stay tight for decades, and frames are paintable and slimmer. Vinyl remains the value leader and performs well here. If budget is tight, a quality vinyl window installed well beats a premium window installed poorly.
Look for 0.30 or lower — ENERGY STAR's current criteria for our zone is 0.25 — with SHGC around 0.40 or below. Lower U-factor means less heat escaping in winter. Virtually every double-pane Low-E/argon window from the major brands meets these numbers; the NFRC label on the glass is where you verify it.
The 100 Series is Andersen's value line, made of Fibrex composite — about twice as strong as vinyl. The 200 Series is a simplified wood window with clad exterior in standard sizes. The 400 Series, Andersen's best seller, is a wood-interior window with durable Perma-Shield exterior cladding and full custom sizing.
Casements seal tighter — wind pushes the sash into the weatherstripping — and open fully for ventilation, but cost more and have size limits. Double-hungs are the traditional Virginia look, cost less, and tilt in for easy cleaning. Many homes mix them: double-hungs up front, casements over the kitchen sink.
Fiberglass for most homes: it won't dent, rust, or rot, insulates well, and convincingly mimics wood grain. Steel costs less and feels more secure but shows dents and can rust once scratched. Reserve real wood for statement entries where you'll commit to the refinishing schedule.
Yes, modestly — argon is denser than air, so it slows heat transfer between the panes and improves U-factor at very low cost. The bigger performance driver is the Low-E coating, which reflects radiant heat. Together they're standard on almost every quality window today; neither is worth skipping.
Like-for-like window and door replacement usually needs no permit in Virginia — details on our answers page.
Whole house or one drafty room — a real builder measures, explains the label numbers, and prices it straight.
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