How to Make Sure Your Windows Keep the Unwanted Out: Bugs, Drafts, Heat and Intruders (2026)

Updated October 2026. Window safety and energy figures checked against the U.S. Consumer Product Safety Commission, ENERGY STAR and the 2026 Florida Statutes, read October 29, 2026.

To keep the unwanted out of your windows (bugs, drafts, heat, water and intruders), fix what’s broken first, then add the right layer for each problem: screens for insects, weatherstripping and storm windows for drafts, shades or awnings for heat, and locks, stops or shutters for security. Keep kids in mind too. As of October 2026, the CPSC says never to depend on screens to keep children from falling, and to use window stops that open no more than four inches.

Jump to: 🪜 Repair first · 🏠 Bugs and pests · ⏱️ Drafts and heat · 📍 Security · 🤝 Child safety · ❓ FAQ

Windows let in the good stuff: light, breeze, the view. They also let in mosquitoes, July heat, rain and, now and then, someone who shouldn’t be there. The trick is to block each unwanted thing without losing what you love about the window. Here’s a practical, room-by-room way to do it, from the cheapest fix up.

What should you repair first?

Start with a walk around the house, inside and out. Look for:

• Cracked or broken glass, and fogging between double panes (a failed seal).
• Gaps where the frame meets the wall, and old caulk that’s cracked or missing.
• Torn screens, bent screen frames and missing screen splines.
• Locks that don’t latch, sashes that won’t stay up, and windows painted shut.
• Soft or stained wood on the sill, which usually means water is getting in.

Fix those first. A broken lock or a gap around the frame undoes any fancy upgrade. Fogged double panes can often be fixed by replacing the glass unit, not the whole window; our guide on addressing window seal issues explains the options. If tenants caused the damage, see property damages by tenants for how to handle it.

Here’s the short version, problem by problem:

How do you keep bugs and animals out?

Screens are the first line. Fine mesh keeps out mosquitoes and gnats; pet-resistant mesh stands up to claws. Replace torn mesh rather than patching it, and make sure each screen sits tight in its frame with no gaps at the corners. Retractable and fly screens work on doors and wide openings.

Window style matters too. Bi-fold aluminum windows open a wall to the patio and pair well with a matching insect screen, which is popular in hot climates. If you’re thinking about that kind of opening, visit Custom Screens to find out more about the frames and screen options.

Seal the outside, too. Caulk gaps where the frame meets siding, and check where pipes, wires or vents pass through the wall nearby. Squirrels, birds and bats find gaps fast. Our guides to getting rid of unwanted animals and keeping bugs at bay cover the rest of the house.

How do you stop drafts, heat and water?

Drafts. Weatherstrip the moving parts (sashes) and caulk the fixed joints (frame to wall). It’s cheap and takes an afternoon.

Storm windows. If you have old single-pane glass you love, ENERGY STAR says certified low-e storm windows installed over single-pane clear glass can save about 20% on annual heating and cooling bills, on a national average, with payback in about three years.

Replacement windows. When the frames are failing, ENERGY STAR says certified windows lower household energy bills by an average of up to 13% when they replace single-pane windows. Savings depend on climate. Our guide to the advantages of high-quality windows and how modern glass installations enhance property value help you compare.

Heat and glare. Cover windows from the inside with cellular shades, blackout curtains or reflective film. On the outside, exterior shutters, solar screens and awnings stop heat before it reaches the glass, which works better than blocking it inside. An awning over a south- or west-facing window also keeps rain off the sill. For more cooling ideas, see Fighting The Heat Wave and Managing Your Home Temperature as a Homeowner.

Water. Check that sills slope away from the house and that exterior caulk is intact. Condensation on the inside of the glass in winter means indoor humidity is high; run fans and a dehumidifier.

How do you make windows harder to break into?

Most fixes are simple and cheap:

• Lock every window, every time, including upstairs ones near a porch roof.
• Add secondary locks or pin locks to sliding and double-hung windows.
• Put a dowel or security bar in the track of sliding windows and doors.
• Trim shrubs below windows so nobody can work there unseen, and add motion lights.
• Consider security film, laminated glass or exterior security shutters on ground-floor windows.

Keep fire safety in mind. Bars and fixed grilles can trap people inside. Any guard on a bedroom window should open from the inside quickly, without a key. For the full picture, read the different ways to protect your home and how to choose.

Renting? In Florida, s. 83.51(2)(a), 2026 Florida Statutes, lists locks and keys among the things a landlord of a unit other than a single-family home or duplex must reasonably provide, unless the lease says otherwise in writing. Ask your landlord before drilling into frames.

How do you keep children safe around windows?

This is the one “unwanted” thing that goes the other way: a child falling out. The CPSC’s April 2026 release estimates about 5,600 children aged 12 and under were treated in emergency departments in 2024 after falling from a window, and about one in three were hospitalized. It counts at least 25 deaths from 2021 to 2023, 80% of them between May and October. The CPSC recommends:

• Install window guards; on the 6th floor and below, use guards adults and older children can open easily in a fire.
• Install window stops so windows open no more than four inches.
• Never depend on screens to keep children from falling.
• Open windows from the top, not the bottom, when you can.
• Keep furniture away from windows so kids can’t climb up.

Renters should talk to their landlords about guards, the CPSC adds. Do a quick check each spring, when windows start opening again: test every stop and guard, move the toddler bed and the reading chair away from the glass, and remind older kids that the window isn’t an exit unless there’s a fire.

Good windows show up when you sell, too. Clean glass, working locks and screens without holes are small things buyers and inspectors notice. When you’re ready, Beycome lists homes on the major home search sites and the MLS with flat fee MLS packages from $99, with $0 Beycome fee at closing, in 17 states and DC. For more ways to add value first, read How To Increase The Value Of Your Property? and 10 expert tips to clean window panes.

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