Windows are the most oversold upgrade in Florida. They are also, in the right house, the one that fixes three problems at once — heat, noise, and what happens when a storm throws something at your wall. The honest version is that windows are sometimes the right first spend and sometimes the wrong one, and the difference comes down to your house, your county, and your insurance policy. Here is how to tell which situation you are in.
What a window actually does in a Florida house
In a cold climate, a window's job is to stop heat escaping. In Central Florida it is the opposite — the job is to stop the sun's heat getting in. That distinction matters because it changes which number on the sticker you should care about.
Every window sold in the US carries an NFRC label with two figures that matter here:
- SHGC (Solar Heat Gain Coefficient) — how much of the sun's heat the glass lets through, on a scale of 0 to 1. Lower is better in Florida. This is the number that decides how hard your air conditioner works on an August afternoon.
- U-factor — how readily heat conducts through the whole window assembly. It matters far less here than it does in Ohio, because our temperature difference across the glass is small compared with the sun load hitting it.
A salesperson leading with U-factor is selling you a northern window. In Central Florida, a low SHGC with a good Low-E coating is what shows up on the power bill. Low-E is a microscopically thin metallic layer on the glass that reflects infrared heat while letting visible light through — it is the reason a modern window can be bright without being hot.
Impact windows: are they actually required where you live?
This is where most homeowners get talked into something they may not need — or talked out of something they do. Florida's requirement for opening protection applies inside what the code calls the wind-borne debris region. Broadly, that covers locations within a mile of the coast where design wind speeds reach 130 mph or more, and anywhere at all where they reach 140 mph or more.
In practical terms across the areas we serve:
- Pinellas County — St. Petersburg, Clearwater, Largo, Pinellas Park — falls inside the wind-borne debris region county-wide. Opening protection is a code requirement on new and replacement glazing.
- Coastal Hillsborough, Manatee and Sarasota — Tampa's waterfront neighbourhoods, Bradenton, Sarasota — the coastal portions are inside it. Inland addresses in the same counties often are not.
- Polk County — Lakeland, Winter Haven, Plant City, Lake Wales — generally sits outside the wind-borne debris region. Impact glazing here is usually a choice, not a legal requirement.
We say "generally" deliberately. The boundary is drawn from wind-speed maps, not county lines, and your local building department has the final word on your specific address. We check it before quoting, and we will tell you if you do not need what you were about to buy.
Where protection is required, code-approved shutters are an accepted alternative to impact glass. Shutters are cheaper up front. They also have to be put up before every storm, by someone, in the rain, which is a real cost that does not appear on the invoice.
The insurance side, explained properly
Florida law requires residential property insurers to build windstorm mitigation discounts into their rate filings — specifically for construction features that improve opening protection and window, door and skylight strength. That is not a marketing claim; it is written into the statute. A wind mitigation inspection documents what your home has, and the insurer applies the corresponding credit.
Two things homeowners are rarely told, and both matter before you spend:
- The opening-protection credit generally requires every glazed opening to be protected — windows, doors, skylights, the lot. Doing seven of nine windows typically earns nothing. If budget means a partial job, know going in that the insurance benefit usually waits until it is finished.
- The size of the credit varies by insurer and by the rest of your home's construction. We do not quote a figure, because anyone who does is guessing at your policy. What we do is make sure the paperwork and product approvals are in order so your inspector can actually document the work.
When windows are the wrong first spend
We would rather say this than sell you the wrong job. If your upstairs runs hot, your power bill climbs every summer, and your attic has thin or settled insulation, windows are almost never the best first dollar. In a typical Central Florida home the attic is the dominant heat path — a vented attic on a July afternoon can run 30 to 50°F above the outdoor air, and if your ductwork runs through that space, the air conditioner is fighting a battle it cannot win no matter what glass you install.
Air sealing and attic insulation usually deliver more comfort per dollar than window replacement in that situation. New windows on an under-insulated house look better and feel roughly the same.
Windows move to the front of the queue when: the frames are rotted, failed or painted shut; the glass seals have blown and the panes are fogged; you are in a required opening-protection area and have no shutters; road or airport noise is the actual complaint; or you are already at good attic R-values and looking for the next gain.
Frames: what holds up here
Florida is hard on window frames in a way that dry climates are not — UV, salt air near the coast, and daily thermal movement.
- Vinyl — good thermal performance, no corrosion, low maintenance. Quality varies enormously between manufacturers; welded corners and heavier extrusions hold their shape in our heat.
- Aluminum — strong and slim-sighted, which matters on large impact units. Conducts heat readily, so thermally broken frames are worth the difference here.
- Composite and fibreglass — dimensionally stable and durable, at a higher price point.
Older Central Florida homes very often have non-standard openings. We measure every opening and order to fit rather than forcing a stock size and packing out the gap, which is where leaks start.
What the job actually involves
Replacement windows are permitted work. We pull the permit, install to the manufacturer's Florida Product Approval — that approval is what makes the installation legal and insurable — and the work is inspected.
On install day, we protect floors and furniture, remove the old units, prepare and flash the opening, set and fasten the new window to spec, seal it, and finish the interior and exterior trim. Flashing and sealing are the part nobody sees and the part that decides whether the window leaks in five years. A whole-house replacement typically runs one to three days depending on count and access. We clean up and haul the old units away.
What drives the price
Impact-rated glazing costs meaningfully more than standard insulated glass — laminated construction, heavier frames, tested assemblies. Beyond that: the number and size of openings, style (fixed picture units cost less per square foot than operating windows), whether the openings are standard or custom, wall construction — block versus frame changes the labour — second-storey access, and how much trim and finish work the old installation left behind. Anyone quoting you a per-window price without seeing the openings is guessing.
Common questions
Do impact windows replace hurricane shutters?
Yes. Where opening protection is required, code-approved impact-rated windows satisfy it on their own — there is nothing to put up before a storm and nothing to store. That permanence is most of the value for people who travel, rent the property out, or simply cannot get on a ladder before a storm.
Will new windows lower my power bill?
They reduce solar heat gain, and in a house with a lot of west- and south-facing glass that is a real difference you can feel by mid-afternoon. But we will not put a dollar figure on it, and you should be wary of anyone who does — the honest answer depends on your existing windows, your glass area and orientation, and above all how well the rest of the envelope performs. If the attic is under-insulated, fix that first and the windows will do more when their turn comes.
Can I replace just a few windows now and the rest later?
Yes, and it is a sensible way to spread the cost — start with the worst-performing elevation, usually west-facing. Just go in knowing that insurance opening-protection credits generally require every glazed opening to be protected, so that benefit typically waits until the job is complete.
How long does a whole-house replacement take?
Usually one to three days on site once the windows arrive, depending on how many openings there are and how accessible they are. The longer part is the manufacturing lead time after measurement, which varies with the product and the season — impact units ordered in the run-up to hurricane season take longer than the same order placed in February.