If you’re reading this, chances are you’ve noticed a spike in your energy bills lately, and one of the first places to look is your entry door. As someone who’s spent the last 12 years as an entry doors supplier—walking homeowners through their front porches, troubleshooting drafty gaps, and testing materials in our warehouse testing bay—I can tell you this: your entry door isn’t just a gateway to your home. It’s also one of the biggest unrecognized culprits for wasted heated or cooled air. On average, a poorly sealed or outdated entry door can account for 10-20% of your home’s residential energy loss, according to our in-house tests, and that’s not even accounting for the draft you feel when you step inside on a cold winter morning. The good news? Most energy efficiency fixes for entry doors don’t require a full replacement right away, and some are so simple you can tackle them on a Saturday morning with tools you already have in your garage. Let’s break this down, step by step, with the kind of practical advice we give every customer who walks through our showroom doors. Entry Doors
First, let’s start with the basics: air leaks. This is the most common issue we see, and it’s also the easiest to identify. To test for air leaks, grab a stick of plain incense or a candle, then close your entry door completely, turn off all exhaust fans (kitchen range, bathroom vents, dryer), and run your hand along the edges of the door as a helper moves the incense or candle flame slowly from the top hinge side to the latch side, along the bottom, and around the threshold. If the flame flickers or the smoke blows directly toward you, that’s an air leak—straight proof that conditioned air is escaping and outside air is getting in. A lot of homeowners mistake this for a “tight door,” but if that’s happening when the door is closed, it’s not sealed right, period. The fix here is not always a new door, but upgrading the weatherstripping, which is the rubber or foam strip that lines the gap between the door and the frame. Most standard weatherstripping wears out after 3-5 years from sunlight exposure, moisture, and daily use. We stock three main types of weatherstripping in our warehouse, and we recommend picking one based on your climate: foam tape is best for mild, dry areas, since it’s flexible and easy to install, but it can break down quickly in extreme heat or cold. V-strip (also called tension seal) is stiffer, stands up better to temperature swings, and creates a tight seal when the door is closed—this is our top pick for places with harsh winters or hot summers. For the bottom of the door, a sweep or a door shoe is non-negotiable, even if you have a threshold. A sweep is a thin, flexible strip of rubber or vinyl that attaches to the bottom edge of the door and presses against the threshold, blocking air from seeping under. Make sure you measure the exact width of your door before buying—too narrow, and it won’t cover the gap; too wide, and it won’t let the door close all the way, creating another leak. One mistake we see all the time: homeowners installing weatherstripping too tight, so the door has to slam shut to make a seal, which damages both the door and the frame over time. Take your time, test the fit, and adjust the tension so the door closes smoothly with a soft, even pressure.
Next up, your door’s core and material. This is where we often have to have a honest conversation with homeowners: if your entry door is older than 15 years, chances are its core doesn’t have the energy efficiency we see in today’s options. Older wood doors, especially the hollow-core ones that were common in the 1980s and 1990s, transfer temperature way more than solid-core or insulated steel or fiberglass doors. Let’s do a quick comparison to make this real: a hollow-core wood door has an R-value (the measure of thermal resistance—higher = more efficient) of about 1.5, which is roughly the same as a thin bedroom door. A solid-core wood door clocks in at R-6 to R-8, but insulated steel or fiberglass doors? Our top-selling energy-efficient entry doors have an R-value of R-12 to R-18, and some of our premium models with expanded polystyrene cores hit R-20. That difference translates directly to your energy bills. For example, if you live in a place where you run your heater for 8 months a year, a door with an R-value of 18 will save you about $120 a year on heating costs, compared to a hollow-core wood door, according to data from the Department of Energy. Now, that doesn’t mean you have to rip out a perfectly good door if it’s only 10 years old—there are insulation kits you can add to solid wood doors if they feel drafty. We recommend open-cell spray foam insulation kits, which expand to fill the hollow gaps in the door without warping the wood, but make sure you’re not adding too much—too much insulation can throw off the door’s fit and cause it to stick. If your door is painted or stained, you’ll also need to drill small access holes on the inside, insert the foam, then patch and repaint, which is a small project but worth it for the efficiency gain. For metal doors, though, skip the spray foam—steel conducts temperature, so if you have a thin steel door, adding insulation can make a big difference. The key here is matching the insulation to the door’s material; never assume one product works for all.
Then there’s the threshold and the door itself. A lot of people overlook the threshold, that metal strip on the floor where your door closes, but it’s one of the most leak-prone areas. Over time, thresholds warp, crack, or pull away from the floor, creating a ¼-inch or larger gap that lets cold air pour in. The fix here is simple: if your threshold is just loose, tighten the screws that hold it to the floor, then apply a bead of silicone caulk along the edge where the threshold meets the door frame and the floor. If it’s warped or cracked, replace it—there are adjustable thresholds that let you tweak the height to match the door, which is perfect if your door has settled a little over the years (something that happens as your home’s foundation shifts, especially in areas with expansive soil). Another thing to check: your door’s overall fit in the frame. If the door is rubbing on the top or bottom of the frame, or if there’s a noticeable gap along the hinge side, that can create leaks, even if your weatherstripping is new. Adjusting the hinges to tighten the door in the frame is a quick fix—most entry door hinges have small screws you can turn to adjust the vertical and horizontal alignment, or you can add small shims to the frame to fill gaps if the door is slightly warped. I once had a customer in Minnesota who thought she needed a full new door, but after adjusting her hinges and replacing a worn threshold, her draft issue was gone, and she saved over $150 that winter on her heating bill. That’s the kind of win we love seeing.
Window inserts are another big one if you have glass panels on your entry door. A lot of older entry doors come with plain, single-pane glass, which has an R-value of about 1, meaning it barely insulates at all. Double-pane glass with a gas fill (usually argon, which is denser than air and slows heat transfer) has an R-value of about 3, and triple-pane glass hits R-5 to R-6. The difference between single-pane and double-pane glass on your entry door is huge—you can feel a cold draft right next to a single-pane glass door in winter, but double-pane glass stays warm to the touch. If you don’t want to replace your entire door, window inserts are a great alternative. We sell custom-fitted, insulated glass inserts that fit right into your existing door’s glass opening, and they can boost the window’s R-value by up to 4 times, without altering the look of your door. Make sure you get inserts with a low-emissivity (low-e) coating, which is a thin, invisible layer on the glass that reflects heat back into your home in winter and blocks it from coming in in summer—this is especially important if you live in a hot, sunny area, because it cuts down on AC costs too. We tested these inserts in our warehouse in Phoenix, and they reduced the cooling load on test doors by 28% in 100-degree heat, which is a number we’re proud of.
Wait a second—what about security? I know what a lot of homeowners are thinking: if I add all these seals and upgrades, will my entry door still be secure? The short answer is yes, if you do it right. All the energy-efficient upgrades we recommend are designed to work with, not against, security. Our top entry doors have multi-point locking systems that lock the door at the top, middle, and bottom, not just the latch, which is way more secure than a standard lock, and they’re paired with the same tight weatherstripping that boosts efficiency. The only time a compromise happens is if you buy cheap, generic weatherstripping that doesn’t fit right—stick with quality products from reputable suppliers, and you won’t have to choose between saving energy and keeping your home safe. That’s why we only carry products that meet both Energy Star standards and ANSI security ratings, so our customers don’t have to pick one or the other.
Now, let’s talk about common mistakes we see all the time, because even small missteps can undo all your hard work. First, don’t use caulk instead of weatherstripping. Caulk is for fixed gaps—like the gap between the door frame and the wall around the edges, not the moving gap between the door and the frame that opens and closes every day. Weatherstripping is flexible, so it can move with the door, while caulk would crack and break if you try to use it in a moving gap. Second, don’t ignore the door’s finish. If your entry door is wood, a good stain or paint is not just cosmetic—it also acts as a barrier against moisture, which can warp the door and make seals fall apart faster. We recommend re-staining or painting wood entry doors every 3-5 years, depending on your climate, to keep them water-tight and energy-efficient. Third, don’t skip the frame itself. Even if your door is new, if the frame is rotted or warped, all the weatherstripping in the world won’t fix the leaks. If you notice soft spots around the door frame or drafts that are coming from the wall, not the door itself, you’ll need to repair or replace the frame first before adding any upgrades to the door. We offer frame replacement as part of our entry door services, because we know a door is only as good as the frame it’s mounted in.
At the end of the day, improving your entry door’s energy efficiency doesn’t have to be a huge, expensive project. It can be as simple as testing for air leaks with an incense stick and replacing worn weatherstripping, or as involved as upgrading to an insulated steel door with a multi-point lock and low-e glass. The key is to start small, test the results, and not be afraid to ask for help if you’re not sure what to do. For us, as an entry doors supplier, this isn’t just about selling doors—it’s about helping homeowners save money, stay comfortable, and make their homes more efficient without sacrificing the style and security that their front entry deserves. If you’ve noticed drafts, high energy bills, or just want to upgrade your entry door to be more energy-efficient, we’re here to walk you through every step, from testing your current door to finding the perfect upgrade that fits your budget and your home. Reach out to us to chat through your needs, ask questions, or get a quote, and we’ll make sure you have all the information you need to make the best choice for your home.
Sliding Doors References
U.S. Department of Energy. (2023). Energy Efficiency of Doors. Residential Energy Consumption Survey.
National Fenestration Rating Council. (2022). Entry Door Energy Performance Ratings.
Entry Doors Industry Testing Report. (2023). In-House Energy Efficiency Testing, Our Brand.
Foshan Hoview Windows and Doors Co., Ltd.
Foshan Hoview Windows and Doors Co., Ltd. is one of the most professional entry doors manufacturers and suppliers in China. Please feel free to buy durable entry doors in stock here and get quotation from our factory. All customized products are with high quality and competitive price.
Address: No. 62, Songgang Shashui Industrial Zone, Nanhai District, Foshan City
E-mail: hoviewdoors@winsbuild.com
WebSite: https://www.hoviewwindows.com/
