Stergis Windows in Tampa: How to Judge Energy Efficiency and Storm Ratings

People searching for Stergis windows usually want two things from a window: a cooler house in Tampa’s heat, and real protection when a storm comes through. Both can be checked with labels and paperwork instead of sales language, and that is what this page walks you through.

This page is not published by Stergis, and STH Windows & Doors does not list Stergis specifications, ratings or warranty text. Any window you consider, from any maker, should come with the same set of documents, so we will explain what each one means and then show you the window lines we sell and install in Tampa, St. Petersburg and the surrounding area.

What to look for in an energy-efficient, storm-rated window

Words like efficient, durable and storm-ready are not measurements. The six items below are, and each one can be checked before you sign anything.

The NFRC label

Look for the National Fenestration Rating Council label on the window. It typically reports U-factor, solar heat gain coefficient, visible transmittance and sometimes air leakage, measured the same way across products, which makes it a fair way to compare two windows that look alike. The label belongs to a specific window configuration, so match it to the exact size and glass on your quote.

U-factor and solar heat gain in a hot climate

U-factor describes how readily heat moves through the whole window, and a lower number means less heat transfer. Solar heat gain coefficient describes how much of the sun’s heat comes through the glass, and again lower means less. In a cooling-dominated place like Tampa, solar heat gain is usually the number to watch first, and Low-E coatings are the usual way to bring it down. Treat the numbers as a comparison tool, not a promise of any particular savings.

ENERGY STAR

ENERGY STAR is a government-backed program, and its window criteria differ by climate region, so the question is whether the specific window qualifies for the region that includes Tampa. Not every glass option within a product family will qualify, which is why it pays to ask about the exact configuration. You can browse our ENERGY STAR rating category and then confirm the label details for your size and glass.

Design pressure rating

Design pressure is the wind load a window has been tested to handle, and it is specific to the product and size. A larger window can carry a different rating from a smaller one in the same line. Your permit office, and sometimes an engineer, determines what your address needs, so ask each company for the rating of every size on the quote rather than accepting a general statement that the window is storm-rated.

Impact glass and Florida approval

In the wind-borne debris region, windows need impact-rated glass or approved shutters. Impact glass is laminated, with a strong interlayer that holds the pane together after a hit, and it often cuts outside noise as well. The product should carry a Florida Product Approval or Miami-Dade approval number that you can check yourself on the Florida Building Commission site. Impact glass is a protection feature, so confirm the energy numbers separately, since they come mostly from the coatings, glass package and frame.

Installation quality

A rated window only performs as rated if it is installed the way its approval requires. Approvals typically spell out anchoring and sealing details, and gaps around the frame leak air and water whatever the label says. Ask who installs the windows, whether the work follows the product’s installation requirements, and whether the permit and final inspection are part of the job.

Documents to ask for before you sign

Ask for these in writing for each window on the quote. If a company cannot produce them, treat that as useful information.

If you are weighing Stergis windows against other storm-rated options, line the labels up next to each other. Two windows that look identical can carry different numbers, and the numbers are the honest basis for comparison.

Window lines to start with

Pick the goal that matters most to you and start there, then ask for the label and approval documents for the exact size and glass you choose.

• Storm protection first: the impact-resistant range and the impact-resistant glass category.
• Energy ratings first: our ENERGY STAR rating category.
• Vinyl: CWS WINDPACT (sliding, casement and awning), CWS STORMSTRONG single-hung and PGT ENERGYVUE, with more at vinyl windows.
• Aluminum: CWS ICON sliding and PGT CLASSICVUE MAX, with more at aluminum windows.
• By maker: PGT, CWS and ES Windows, including the Prestige and Elite windows.
• By style: single hung, double hung, casement and horizontal roller windows.

Is an energy-efficient, storm-rated upgrade worth it?

For many Tampa homeowners the appeal is the combination: less sun heat coming through the glass and no shutters to hang before a storm. We will not promise a savings figure, because the result depends on your house, your current windows and how you use your air conditioning. It is more useful to compare label numbers and approval documents side by side.

Ask your insurance agent whether opening protection affects your policy, and keep the installation paperwork, because a wind mitigation inspection will want to see it. When you are ready, call us for a free consultation and we will talk through the options with a no-pressure approach.