Fix a cold entry in this order: replace the weatherstrip, corner pads and sweep and adjust the threshold first, because that is where most of the air comes in. Add a storm door if the problem is wind and cold radiating off the door. Replace the door and frame when the slab is uninsulated or warped, the jamb bottoms or threshold are rotted, or the frame gap itself leaks.
That order matters because the three fixes do different things. This guide is for a Twin Cities homeowner standing in a cold hallway trying to decide which one to pay for. If you want the full list of draft repairs on the door you have, that post exists: jmbbuildersmn.com/blog/drafty-front-door-fixes. This one is the decision between a storm door and a new door.
Which fix actually stops the draft?
Air and cold reach you from an entry door in different ways, and each fix addresses one of them:
| What you notice | Cause | Fix |
|---|---|---|
| Moving air at the edges, light showing at corners or under the door | Worn weatherstrip, missing corner pads, worn sweep, threshold out of adjustment | Weatherstrip, corner pads, sweep, adjust threshold |
| Cold air at the casing, not the door edge | Empty or fiberglass-stuffed frame gap behind the trim | Pull casing, foam or backer rod, interior sealant bead |
| Door feels cold to stand near; no moving air | Uninsulated wood slab, single-pane lite, or steel door with no thermal break | Storm door helps; new insulated door fixes it |
| Wind rattles the door or blows it against the latch | Exposed entry with no wind buffer | Storm door |
| Frost on the inside face or around the lockset | Steel slab with no thermal break, or metal frame | New door; a storm door hides it and can make it worse |
| Soft wood at the jamb bottoms, threshold flexes, paint peeling low | Water in the frame; sill pan missing | Jamb and threshold repair, or a new prehung door on a sill pan |
How do I find where the cold is coming from?
Do this on a cold, windy evening with the lights off inside and the porch light on. Look at the door edges from inside for light; light means air. Run the back of your hand slowly around the door edge, then around the outside of the casing. Air at the door edge is weatherstrip. Air at the casing is the frame gap.
Then touch the door face and the jamb. A slab that is cold but not leaking is an insulation problem in the door itself. Frost or condensation on the inside face means the material is conducting, which is a steel door without a thermal break or a metal frame. Finally, press on the threshold and the bottom of the jambs with a screwdriver. Soft wood means water has been getting under the door, and that changes the answer from repair to replacement.
What does a storm door actually do?
A storm door creates a pocket of still air between itself and the entry door. Wind no longer hits the primary door directly, so air leaks around a slightly worn weatherstrip are driven by less pressure, and the glass in the entry door has a second layer in front of it. On an exposed entry that faces the prevailing wind, that buffer is noticeable. It also protects the finish on a wood door from rain and sun.
What it does not do is insulate a bad door. A storm door is a thin aluminum frame with a single pane of glass; its own insulating value is small. If the primary door leaks air at the corners or the frame gap is open, a storm door lowers the wind pressure on the leak but the leak is still there, and in a still cold snap you will feel it. If the slab is an uninsulated wood door or a steel door that frosts, the storm door does nothing for the conduction.
Storm doors come as full-view (one large glass panel, often with a swap-in screen), ventilating (glass that slides to expose a screen), and retractable-screen types. Which one fits your entry is its own decision: jmbbuildersmn.com/services/labor-only/choosing-a-storm-door. For the draft question, any of them gives the same buffer; the ventilating and screen types give you a way to relieve heat in summer, which matters for the next section.
Why do dark doors and glass storm doors not mix?
The still-air pocket that helps in January becomes an oven in July. A full-glass storm door in front of a south- or west-facing entry door traps solar heat between the two doors. A dark-painted or dark-stained entry door absorbs most of that heat. The result is temperatures against the slab high enough to soften finishes, fade paint, warp a wood or vinyl-skinned door, and in some fiberglass and steel doors delaminate the skin or blister the paint.
This is common enough that some door manufacturers tell you not to install a storm door over their entry doors at all; Andersen's help center, for example, says they do not recommend a storm door over Andersen entry or patio doors, and cites heat build-up damaging finishes and components. Other manufacturers allow it with conditions: light-colored doors, a vented storm door, or the storm door's glass swapped for a screen in the warm months. Check your door's warranty language before adding one, because heat damage under a storm door is a common exclusion.
If you have a dark door and want a storm door for winter wind, the workable combination is a ventilating or screen-swap storm door, the screen in from spring to fall, and a lighter color on the entry door when it is next painted.
When is a new insulated door with a new frame the fix?
When more than one thing on the symptom list is true. A prehung exterior door replaces the slab, the jambs, the weatherstrip, the threshold and the sweep as one factory-fitted unit, and the install rebuilds the frame gap with a sill pan, foam and an interior seal. That is why it fixes several problems at once, and why it is the right call in these cases:
- The slab is an old solid-wood or hollow door with no foam core, or a steel door that frosts inside. No weatherstrip or storm door changes the material.
- The jamb bottoms or threshold are rotted. The rot means water has been getting under the door for years, usually because there is no sill pan. A new frame on a pan stops it. If only the jamb bottoms are soft and the slab is good, a splice repair is the smaller job: jmbbuildersmn.com/services/doors/exterior-door-jamb-bottom-rot.
- The door is warped or the frame is out of square so the slab cannot compress the weatherstrip evenly, and adjusting the hinges and strike has not fixed it.
- The glass lite is single-pane or fogged and the slab is not worth a new insert.
- You are already replacing siding or trim at the entry, so the frame gap is exposed anyway.
What should a new entry door have to stay warm?
Since the door is the fix, order the parts that make it one. A polyurethane foam core is standard on steel and fiberglass slabs. On steel, look for a thermal break at the edge so the inside face stays warm. On any door with glass, ask for the Low-E, argon-filled insulated lite with a warm-edge spacer. ENERGY STAR rates doors by glass area; an opaque door carries the strictest U-factor, and the allowed number rises as the lite gets bigger, so less glass is more insulation.
The frame side is just as important: compression weatherstrip in a kerf on the jambs and head, corner pads, a bottom sweep and an adjustable threshold. Composite or rot-resistant jamb bottoms are worth it on an entry with no roof over it. And the install: a sill pan with a back dam under the threshold, low-expansion foam or backer rod around the frame, a continuous sealant bead to the drywall inside, sealant at the exterior jambs and head with the sill left to drain, and a drip cap over the head.
The door itself can come from any brand or store; we install what you buy. If the entry door is sound and the trim around it is what has rotted, that is a smaller repair as well: jmbbuildersmn.com/services/exterior-trim/rotted-door-trim-replacement.
What moves the price of each option?
Weatherstrip and sweep replacement is priced per door and is the smallest job by far; the threshold adjustment is part of it. A storm door install is priced per door as labor, plus whatever storm door you buy; the variables are the condition of the brickmould it mounts to, whether the opening is square, and whether a closer and a handle set are included in the box. A new prehung entry door is priced per opening for labor with the door as your purchase or ours; what moves it is rot repair at the framing, siding or brick that has to be cut back and patched, sidelites or a transom, new interior casing, and painting, which we quote as a separate line or leave primed for you to paint.
The mistake to avoid is buying the middle option because it is the middle price. A storm door on top of a leaking or frosting entry door spends money on a buffer for a door that still needs replacing, and can put the new storm door in front of a dark slab it will cook.
What JMB Builders does
JMB Builders is a licensed Minnesota residential building contractor (BC809005) based in Zimmerman, working across the Twin Cities metro with one crew. We do all three fixes: weatherstrip and sweeps on the door you have, storm doors you bought hung and adjusted, and full entry door replacement on a sill pan with the frame gap sealed. Send photos of the door from inside and out and the bottom of the jambs, and you have a written quote within one business day that says which fix we would do. Paid by check or direct deposit.
- Door sweep and exterior door weatherstripping replacement — jmbbuildersmn.com/services/doors/door-sweep-and-weatherstripping
- Storm door installation, labor only, you buy the storm door — jmbbuildersmn.com/services/doors/storm-door-installation-labor-only
- Exterior door threshold replacement — jmbbuildersmn.com/services/doors/exterior-threshold-replacement
- Rotted door jamb bottom repair — jmbbuildersmn.com/services/doors/exterior-door-jamb-bottom-rot
- Labor-only installation of an entry door you bought — jmbbuildersmn.com/services/finish-carpentry/door-installation-labor-only
Frequently asked questions
Does a storm door help with drafts?
It helps with wind. A storm door creates a pocket of still air in front of the entry door, so wind no longer pushes directly on the weatherstrip and the glass, and a slightly worn seal leaks less. It does not fix a door that leaks at the corners, an open frame gap behind the casing, or a slab that conducts cold. Fix the weatherstrip first, then decide whether a storm door is still needed.
Can a storm door damage my front door?
Yes, through heat. A glass storm door traps solar heat against the entry door, and a dark or sun-facing door can get hot enough to warp, blister, fade or delaminate. Some manufacturers, Andersen among them, advise against storm doors over their entry doors for this reason, and many warranties exclude heat damage under a storm door. A ventilating storm door with the screen in during summer, or a light-colored entry door, reduces the risk.
Is it better to replace an entry door or add a storm door?
Replace the door when the slab is uninsulated or frosts inside, the jamb bottoms or threshold are rotted, or the frame is out of square so the weatherstrip cannot seal. Add a storm door when the entry door is sound and insulated but the entry is exposed to wind or you want protection for a wood door's finish. If the only problem is air at the edges, new weatherstrip and a sweep are the fix and neither of the other two is needed.
Why is my front door cold even though there is no draft?
The door itself is conducting cold. Old solid-wood or hollow doors have no foam core, single-pane lites lose heat through the glass, and steel doors without a thermal break carry cold around the edges to the inside face. Weatherstripping cannot change that. A storm door reduces the effect somewhat by adding a still-air layer; an insulated foam-core door with Low-E glass fixes it.
What does a new entry door include that fixes drafts?
A prehung exterior door comes as a slab and frame fitted together: foam-core slab, compression weatherstrip in the jambs and head, corner pads, a bottom sweep and an adjustable threshold. A proper install adds a sill pan under the threshold, low-expansion foam or backer rod in the frame gap, a sealant bead to the drywall inside and sealant to the siding outside. That replaces every place the old entry leaked in one job.
Should I get a storm door in Minnesota?
On an exposed, wind-facing entry with a sound insulated door, a storm door is a reasonable buffer and protects the finish. On a dark or south-facing door, choose a ventilating or screen-swap model and use the screen in summer, and check the entry door's warranty for storm door exclusions. On a leaking, rotted or uninsulated entry door, spend the money on the door first.
