Guides
Plain-English background to the numbers behind the calculators — how to measure for replacement windows, what united inches mean, egress requirements, U-factor vs R-value vs SHGC, reading an NFRC label, full-frame vs insert, frame materials, window types, when to replace, what’s in a quote, whether windows pay off, and patio vs French vs storm doors.
How to Measure for Replacement WindowsThe smallest-of-three method for measuring replacement windows: take three width and three height readings, order to the smallest, then check squareness.United inches explained: how windows are sized and pricedUnited inches is simply width plus height, the size suppliers use to quote and price windows. What it means, why it beats area, and how to measure for it.Egress window requirements (IRC R310): does your window qualify?The four IRC R310 egress minimums: clear area 5.7 sq ft, width 20 in, height 24 in, sill 44 in. Why all four apply at once and the area trap that fails windows.U-factor vs R-value vs SHGC: reading window energy ratingsU-factor is heat-loss rate (lower is better), R-value is its reciprocal (R = 1 over U), and SHGC is solar gain by climate. How to read the three together.Full-frame vs insert (pocket) replacement: which and what it costsInsert replacements reuse a sound frame for less; full-frame goes to the studs to fix rot, flashing and size. How to choose, with the cost difference explained.How to read an NFRC label: U-factor, SHGC, VT and CRThe NFRC label is the one comparable, third-party window spec. What U-factor, SHGC, VT and condensation resistance mean, and how to compare them correctly.Vinyl vs fiberglass vs wood windows: cost, lifespan and upkeepFrame material shapes price, looks and lifespan: vinyl for value, fiberglass for low-upkeep longevity, wood for looks, aluminum for strength. Compared per year.Double-hung vs casement vs sliding: pick the right window typeOperating style decides ventilation, sealing, egress and cost: double-hung for versatility, casement for a tight seal and egress, sliding for wide openings.When to replace vs repair your windowsDrafts, stuck sashes, foggy panes and worn hardware are often repairable. Replacement is justified by rot, failed frames, egress or safety. How to decide.Window replacement cost breakdown: what is in a quoteA window quote is windows plus labor plus add-ons minus discount, times contingency. Break down the five parts and learn to sanity-check a price per window.Do replacement windows pay off? Energy savings and paybackWindow energy savings equal area times the U-factor drop times HDD times 24 over efficiency times price. Why payback is usually 10-plus years.Patio vs French doors: cost, fit and when to choose whichSliding patio doors need no swing space and cost less; French doors give a wider opening and a traditional look. Compare sealing, cost and the header.Storm door buying guide (and how much they cost)Storm doors add ventilation, weather protection and security cheaply: full-view, ventilating and retractable-screen types, and the solar-heat caution.