A lot of Pinellas Park is single-story block built in the 1960s and 70s, and a lot of it still has the windows it was built with — thin aluminum frames, a single pane of clear glass, and a west-facing room nobody uses after three in the afternoon. Replacing those windows is usually worth doing. But the quotes homeowners bring us vary wildly, and most of the difference comes down to numbers nobody discusses.
In Florida the number that matters is SHGC, not U‑factor
Every window carries an NFRC label with two figures on it. U‑factor measures how much heat conducts straight through the window. SHGC — solar heat gain coefficient — measures how much of the sun's heat gets through the glass. Lower is better on both.
Up north, U‑factor is the headline figure, because the job is keeping heat in. Here the job is keeping the sun out, and SHGC is what does it. A single pane of clear glass lets most of the solar heat straight into the room; a modern low‑E coating reflects much of it back out while still letting light through. That coating is most of what you are paying for.
The benchmark to ask for is ENERGY STAR's Southern zone, which Florida sits in. Under the 7.0 criteria that took effect on 23 October 2023, a qualifying window needs a U‑factor of 0.32 or lower and an SHGC of 0.23 or lower. Ask for both numbers in writing before you sign anything. A salesperson who talks only about U‑factor is quoting you a window designed for Ohio.
Pinellas Park sits in the wind‑borne debris region
This is the part that catches people out, because it changes what you are legally allowed to install. The Florida Building Code defines the wind‑borne debris region two ways: within a mile of the coastal mean high water line where the ultimate design wind speed is 130 mph or greater with an open‑water exposure, or anywhere the ultimate design wind speed reaches 140 mph or greater.
Pinellas County design wind speeds generally fall in the 140 mph‑and‑up range, so most Pinellas Park addresses land inside it. Your exact figure comes from the code wind maps or the ASCE 7 Hazard Tool, and the city building department settles it for your permit.
Inside that region, every exterior opening has to be protected — and the code accepts two ways of doing it: impact‑rated glazing, or approved shutters over ordinary windows. Both are legal. Impact glass costs more up front and is always in place; shutters cost less and have to be put up. Whichever route you take, the product needs a Florida Product Approval number, and the work needs a permit and an inspection. A contractor who offers to skip the permit is handing you a problem for the next insurance inspection or sale.
Do not budget around the federal tax credit
If someone quotes you a 30 percent federal credit on windows, they are working from old information. The Energy Efficient Home Improvement Credit under section 25C terminated on 31 December 2025, and the IRS is explicit that no credit is allowed for property placed in service after that date. Ask your electric utility whether any current program applies, but plan the job on the price in front of you.
What new windows will fix — and what they will not
We install windows and we insulate attics, so we have no reason to oversell either one. In a typical Pinellas Park block house the glass is a modest share of the surface the sun hits. The ceiling is a much larger one, with a vented attic above it that runs well above outdoor temperature on an August afternoon. If your attic is thin or patchy, that is usually the bigger load of the two — and the cheaper fix.
New windows do reliably change what the glass is responsible for: radiant heat off a sunny window, the hot spot in the west room, fading drapes and flooring, street noise, and sashes that stick or no longer latch. What we will not do is put a number on your power bill — too much depends on your equipment, your ductwork, your ceiling and how the house is shaded. Anyone promising a percentage has guessed.
If windows and the attic are both on the list, the usual order is to seal and insulate the ceiling plane first — see attic insulation and blown-in insulation — and then do the glass. The reverse order works too; it is just slower to pay off.
If a storm did the damage
Wind‑driven water through a failed window does not stop at the frame. It gets into the wall and, where the window sits high, into the attic insulation, which holds it. If that is your situation, look at the ceiling and the attic at the same time as the window — our storm damage repair page covers what we check, and wet material has to come out rather than be left to dry.
Five things to check on any window quote
- Both NFRC numbers, in writing. U‑factor and SHGC, for the actual product being installed — not the brand's best model.
- The Florida Product Approval number (or a Miami‑Dade NOA). No number, no install.
- Who pulls the permit. It should be the contractor, and the price should say so.
- Impact glass or shutters — which one the quote assumes, and what the other option would cost.
- Who repairs the finish. Stucco, trim and interior drywall at the opening are part of the job, and leaving them out is how a quote looks cheaper than it is.
When we come out we measure the openings, check which elevations take the afternoon sun, and look in the attic while we are there. Then you get a written price and a straight answer about which job is worth doing first.