Everything You Need to Know About Replacement Windows
No jargon, no sales pitch — just honest information to help you make a confident decision.
Window Styles
Each style has strengths. The best choice depends on where the window goes and what you want it to do.
Double-Hung
Both sashes slide up and down. The most popular style in American homes — great for ventilation and easy to clean.
Best for: Bedrooms, living rooms, most standard openings
Casement
Hinged on one side, opens outward with a crank. Creates an airtight seal when closed — excellent energy efficiency.
Best for: Kitchens (over sinks), hard-to-reach spots, windy climates
Sliding
One or both sashes slide horizontally. Simple operation with a wide view — ideal for openings wider than they are tall.
Best for: Patios, wide openings, modern aesthetics
Picture
Fixed, non-opening window. Maximum natural light and unobstructed views. Best energy performance since there's no operable seal.
Best for: Living rooms, accent walls, paired with operable windows
Awning
Hinged at the top, opens outward from the bottom. Lets in air even during light rain.
Best for: Basements, bathrooms, above doors
Frame Materials
The frame material affects durability, maintenance, look, and cost.
Vinyl
$Pros: Lowest cost, zero maintenance, good insulation, won't rot or rust
Cons: Fewer color options, can't be painted, may warp in extreme heat
Fiberglass
$$Pros: Extremely strong, paintable, excellent insulation, won't warp
Cons: Higher cost than vinyl, fewer manufacturers
Wood
$$$Pros: Classic look, excellent insulation, paintable/stainable, high-end feel
Cons: Highest cost, requires periodic maintenance, susceptible to moisture
Composite
$$Pros: Wood look without maintenance, very durable, paintable
Cons: Limited styles, mid-to-high price point
Energy Ratings
These numbers matter — they determine your comfort and energy bills.
U-Factor
How well the window insulates. Lower is better. Under 0.30 is excellent.
SHGC
How much solar heat passes through. Depends on climate. Cooler climates want higher SHGC (free heat). Hot climates want lower.
STC
Sound Transmission Class — how much noise it blocks. Higher is better. 28+ is good, 32+ is excellent.
Low-E Glass
Microscopic metallic coating that reflects heat. Standard on all quality windows today. Reduces UV fading too.
Not sure which ratings matter most for your climate? Ask Zig — he can look up your climate zone by zip code and tell you exactly what to prioritize.