# Windows & Doors — Renovate Guide
> Window replacement cost guides, energy efficiency comparisons, door types, and installation advice.
> **ICP:** Homeowners replacing drafty windows or upgrading entry doors for energy savings
> **Primary topics:** window replacement cost, double vs triple pane, Low-E glass, NFRC U-factor, fiberglass vs steel door, energy efficient windows
> **Author:** Frank Mercer, Licensed GC (Ret.), HAAG Certified Roof Inspector

## Articles
[https://windows-doors.renovateguide.com/?p=1] Hello world!

## Author
[https://renovateguide.com/author/frank-mercer/] Frank Mercer — 45 years residential/commercial construction, HAAG Certified Roof Inspector, 500+ insurance claim consultations

## Authority & Off-Page Signals
- Primary author: Frank Mercer (HAAG Certified, Licensed GC retired)
- Industry sources cited: NFRC, ENERGY STAR, Pella, Andersen, Marvin, Milgard specs
- Site network: renovateguide.com (home improvement authority hub)
- Site established: 2026

## Supplemental Files
[https://windows-doors.renovateguide.com/llms-author.md] Author bio, credentials, expertise
[https://windows-doors.renovateguide.com/llms-faq.md] 20 Q&A pairs covering windows doors topics