Long-Term ROI of Energy-Efficient Windows in Tampa Bay Homes

I'm over in Odessa (Pasco County). I had all my old aluminum frame windows replaced with hurricane impact windows in 2020. As others pointed out, the energy savings alone won't make you rich, but I calculated that I'm saving around $150 a year on electricity.
The big bonus for me was the insurance discount: my home insurance went down about $300 per year after I upgraded to impact windows (thanks to the wind mitigation credits you get in Florida for having all openings protected). So combined, that's about $450/year I'm saving. On a $10k project, you're looking at roughly 22 years to "pay it off" if you only count those savings. However, I also expect it added to my property value and, importantly, it gave us peace of mind during hurricane season. Not having to mess with storm shutters and knowing the glass can withstand a storm is huge for us.

Has anyone noticed if new windows help with indoor humidity or condensation? Sometimes my current windows get condensation on the inside in the mornings (especially in winter when it's chilly out). I'm near the coast in Dunedin (Pinellas), and the humidity is always high. Wondering if double-pane windows reduce that sweaty condensation on the glass.

@sports_mary, yes, double-pane windows can definitely help with that. With my old single-pane windows, I used to get condensation on the interior glass on cool mornings or when I ran the heater on a cold night. Since upgrading to double-pane, I rarely see condensation on the glass itself. The inside pane of glass doesn't get as cold because of the insulating air gap (and often argon gas fill) between the panes, so it doesn't attract moisture like the old ones did. You might still get a bit of moisture at the bottom of the panes if it's extremely cold outside, but in Florida that's pretty rare. Also, the new windows seal better, so less humid air is sneaking in. Overall, the indoor humidity in my house feels more stable now.

@sports_mary I'm near the bay in South Tampa, and I can relate. Our old windows would get foggy with condensation whenever it was slightly cold out or even just from the overnight humidity in summer. After the upgrade, the glass stays clear and dry inside. A side benefit is that we no longer feel that sticky moisture around the windows or any drafts. I also replaced my front door around the same time, which helped with sealing up the house, but the windows made the biggest difference. So yes, your indoor humidity experience should improve with modern windows.

@animation_summit @slewis17, thanks for the feedback! Good to know. The condensation issue has been annoying, and it sounds like new windows would help 😊.

I’m in Brandon as well, probably not far from you @fashion378. We upgraded to energy-efficient impact windows this year (we hired ProTech Windoors for the job). I have to say, it’s one of the best upgrades we’ve done. The house feels so much cooler in the afternoons now. Before, even with the AC blasting, our kitchen and living room were always a few degrees warmer because of all the sun coming in. Now, those rooms stay even with the rest of the house. Our electric bill dropped by about $25 a month immediately. Another thing I love is how much quieter the house is. We live near a busy street, and now we barely hear the traffic. My only regret is not doing it sooner. If you're on the fence, I'd recommend it.

I haven't done my whole house yet, but I did replace the windows in the master bedroom and one of the worst kitchen windows (the ones that were leaking air and rain). I did those myself to save money, one at a time. Even just doing those few, I noticed the rooms feel less drafty and cool down faster. Planning to slowly do the rest as budget permits. In the meantime, I put a reflective window film on some of the remaining old single-pane windows. The film helps a bit with the heat, but it's nowhere near what the new double-pane windows did. So if you can't afford to do all windows at once, it can still be worthwhile to do them in phases or at least tackle the biggest problem windows first.

@spirituality_rain, that’s exactly my situation. I can’t afford to replace all my windows in one go either. Is it okay to do it in phases like you did? For example, maybe do the upstairs or the south side of the house first, and the rest later? I’m worried I won’t see much benefit unless I do them all, but financially it would be easier to split it up.

@environment_jon, absolutely, you can do them in phases. Any new window you install is going to improve that room’s efficiency. In my case, I did the ones that were in the worst shape first (and the ones getting the most sun). That way I got immediate relief in the most uncomfortable areas of the house. Sure, you won't get the full-house energy benefit until they're all done, but you will definitely notice improvements in the areas you tackle. Just make sure each time you get a few done, you still take advantage of any rebates or credits (I submitted my TECO rebate after the first batch and I'll do it again when I finish the rest, as long as the program is still around). And if you're doing it yourself or using different contractors over time, keep the window style and specs consistent for looks and for the eventual resale.

I did my replacements in stages too. I'm in New Port Richey (Pasco) in a 1970s ranch house. I had about 12 windows, and I replaced 6 of them one year and the other 6 the next year. I focused on the south and west-facing windows first since those got the most sun and were heating up the house. After phase one, the rooms with new windows were noticeably cooler than the rest. Once I did phase two, the whole house equalized. Doing it in two batches was easier on the wallet, and it let me spread out the mess of installation too. Just wanted to chime in that staggering the project is a common approach and it works fine.

What kind of costs are people seeing per window? I know it can vary, but I’m trying to ballpark. I got one quote so far and it averaged out to about $950 per window for double-pane, impact-rated vinyl windows (installed). Non-impact was quoted around $750 each. Does that line up with what others paid in the Tampa Bay area?

@charles_sage, our cost came out to about $900 per window for impact double-pane windows with Karoly, installation included. We had 10 windows of various sizes. The smaller ones were less, the big ones (like a large picture window in our living room) were more, but roughly $900 each on average. Non-impact glass would have been a bit cheaper, maybe $700-ish each, but we figured in Florida the impact upgrade was worth the peace of mind. The quotes we got from others were in a similar range. Just be cautious if you get a quote that is significantly lower – make sure they’re using quality materials and are licensed/insured, etc.

@charles_sage, in my case it was about $1000 per opening for impact windows through ProTech Windoors. Some windows were a little less, but I had a couple of big sliders that were a few thousand each, so when averaged out it was around that $1k mark. Your quotes sound about right for our area. Prices have maybe gone up a bit recently too. I agree with @culture426 – be wary of any quote that is dramatically lower. And also compare the warranties. Sometimes the cheaper options come with shorter or sketchier warranties.

For those who went with vinyl frames (seems most of us did), how are they holding up in the Florida heat? Any warping or discoloration over time? I’ve heard stories about vinyl warping in hot climates. Our old windows are aluminum frame which are awful for insulation, but at least they’re sturdy. Just want to make sure vinyl is durable here.

@snorkeler41, great question. My new windows have vinyl frames (installed two years ago) and so far they're holding up perfectly. No warping, no discoloration – they still look brand new. Good quality vinyl windows are made to handle the heat. I was a bit worried too, but the installer (Karoly) assured me the products they use are tested for Florida weather. Also, vinyl doesn't conduct heat the way aluminum does, so we don't get that heat transfer. My old aluminum frames used to be hot to the touch in the summer sun and even had some corrosion from moisture over the years. The vinyl has solved those issues. Just keep them clean and they'll last a long time.

Does the low-E coating or tint on these energy-efficient windows make your house noticeably darker? I love having a lot of light in my home and I'm a bit concerned that the windows with low-E will have a mirror effect or a tint that reduces the light.

@dennis_rogue, from my experience, the low-E coating is pretty subtle. You might notice a slight tint if you look for it, but it's not like having dark sunglasses on your house or anything. We have plenty of natural light coming in, it just isn't as harsh or glaring as before. One thing I did notice is that the low-E coating cuts a lot of the UV rays, so colors of furniture and flooring won't fade as quickly. But in terms of brightness, I still get a bright, sunlit home – it's just a more comfortable light. If you have a specific preference, some window manufacturers offer different levels of tint, but the standard one used for ENERGY STAR windows in Florida is usually a happy medium that balances efficiency and clarity.

I'll throw in a perspective from an older house. I have a 1950s block home in Tampa that had those old jalousie windows (the crank-out glass slats). Talk about inefficient! We finally replaced them with modern windows. The difference was night and day. Before, it was impossible to keep the house cool – the cold air would go right out those leaky jalousies. After the upgrade, the house holds temperature so much better. Our HVAC run time dropped dramatically. If anyone here has really old style windows like I did, the ROI might actually be quicker because you're fixing a major leak in your home's envelope. Plus, no more rain blowing in through the gaps during storms! So in cases like mine, it was 100% worth it.

I'll echo what others have said about getting quotes. I got three quotes for my window project in Pinellas. Two local companies (one of them was Karoly Windows, which a neighbor recommended, and they gave me a very fair quote) and one quote from a larger statewide company. The pricing varied quite a bit for similar specs. I ended up choosing a local company that wasn't the cheapest or the most expensive, but had the best reputation. So definitely shop around. Also, ask about any promotions or rebates. One of my quotes mentioned a seasonal discount, and as others have pointed out, utilities have rebates and there's also a federal tax credit for energy-efficient windows (I got to claim a tax credit for ours since they were ENERGY STAR rated).

Good point on the tax credit @vr_jeff. I believe currently you can get up to $600 federal tax credit for new energy-efficient windows (at least as of 2023 when I did mine). Also, something to keep in mind is timing: a lot of window companies are super busy these days and windows have to be custom made. I signed my contract in April and the windows weren't installed until late July because of manufacturing lead times. So if you decide to do this, plan ahead. It’s not usually a quick one-week turnaround; in my case it was about a 3-month wait from order to install.