What Another Season of Ignoring This Actually Costs
If the garage shares a wall with the living room, or there's a bonus room sitting right above it, a leaky garage door isn't just a garage problem anymore. It's a house problem. Every afternoon the AC kicks on to fight heat that's radiating straight through that shared wall, and every humid morning it's fighting moisture doing the same thing. Energy auditors commonly point to leaky garage doors and gaps as a source of noticeable cooling loss in homes where the garage sits against conditioned space — often cited in the range of 10-20% higher costs for the rooms nearest the garage. Put off the fix through another hot, humid stretch and that's a few more months of the compressor working overtime for air that's leaking right back out.
What's Actually Letting the Air Through
It's rarely the whole door. It's usually a handful of small failures stacking up:
- Bottom seal (astragal): the rubber strip along the floor cracks, flattens, or pulls away after enough seasons of heat and humidity swelling it and shrinking it back down.
- Side and top weatherstripping: this brittle vinyl trim hardens in the heat and splits, especially on the side that gets more sun.
- Warped panels: Florida humidity swells wood and composite panels unevenly, and storm winds can rack a door just enough that the panels no longer sit flush, even if nothing looks visibly broken.
- Worn rollers or a door slightly off track: if the door isn't closing square in the frame, no seal in the world will stop the gap it leaves.
- An uninsulated door: some older single-layer steel doors have no thermal break at all, so even a perfect seal still lets heat soak straight through the metal.
Why Attached Garages Feel It the Most
A detached garage leaking air is a waste, but it's not touching the AC bill. An attached garage is different, especially if the water heater, HVAC air handler, or ductwork runs through it — which is common in this area. Hot, humid garage air pushes against that shared wall and any ductwork seams, and the AC has to work against it around the clock during the long cooling season here, not just in July and August.
A Quick Test to Settle the Argument
No tools required: close the garage door at night and have someone stand inside with the lights off. Run a flashlight along the bottom, sides, and top from outside. Any light leaking through is air leaking through. During the day, run a hand along the same spots feeling for a draft, and check the bottom seal for flat spots or gaps where it's pulled away from the floor. If the door still shows daylight after it's fully closed, that's not a maintenance debate anymore — that's a repair.
Fixes, From Cheapest to Most Worth It
- Replace the weatherstripping and bottom seal: inexpensive and often enough to stop drafts if the door itself is still straight and square.
- Realign the door: if it's sitting off track or the rollers are worn, no seal will hold until the door itself is moving correctly again.
- Add or upgrade insulation panels: worth it for a garage with a room above it or shared HVAC ductwork, since it cuts heat transfer through the door itself, not just the gaps.
- Replace the door: if panels are warped from storm stress or chronic moisture swelling, patch fixes won't hold for long — a new insulated door built for FL wind-load requirements solves the air leak and the storm durability question at once.
When to Call Apopka Garage Door Service
If the flashlight test shows gaps but the door still opens and closes smoothly, that's usually a Garage Door Maintenance & Tune-Up — realigning the track, swapping worn rollers, and replacing seals in one visit. If the door is visibly off track, binding, or leaning, that's Off Track Door Repair before any new seal gets installed, since a crooked door will just tear through a new seal again. We'll tell you straight whether it's a seal, a repair, or time for a new door — no upsell, just what's actually leaking.
If your garage door is leaking air into the house, call Apopka Garage Door Service today — we serve homeowners throughout Apopka, FL and the surrounding area.