When to Swap Your Screen Door for a Thermal Door Curtain
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The short answer: swap when you stop opening the door for fresh air, not on a date. For most of the country that's somewhere between the first week of October and mid-November. The two products do opposite jobs — one lets air through while stopping insects, the other slows air down — so the moment airflow stops being something you want is the moment the screen stops earning its place.
Two products, opposite jobs
| Magnetic screen door | Thermal door curtain | |
|---|---|---|
| Point of it | Air in, insects out | Slow the air exchange at an opening |
| Material | Fine mesh — 0.5 mm aperture | Heavy Oxford fabric, some with a clear window |
| Season | Roughly April–October | Roughly November–March |
| Best doorway | The door you keep open | The doorway you keep walking through but wish you didn't have to open |
Three signs it's time
- You've stopped propping the door open. If the door has been shut for a week straight, the screen is decoration.
- You can feel the doorway. Standing in an interior doorway to an unheated space — garage, basement stairs, a back porch, an unheated addition — and feeling the temperature change is the clearest signal there's something worth slowing down.
- Somebody's propping a door open with their hands full. Carrying laundry to a cold basement or groceries in from the garage is exactly the case a magnetic curtain is for: it closes behind you without a free hand.
Where a thermal curtain actually helps
Be realistic about the physics. A fabric curtain over a doorway is not insulation and won't fix a draughty house. What it does is reduce how much air moves through an opening you use often. That's most noticeable where there's a real temperature difference across the doorway:
- House-to-garage door — the most common case, and usually the biggest gap in comfort.
- Basement or cellar stairs in an unheated basement.
- An unheated back porch or mudroom you cross constantly.
- A room you're not heating and would rather stayed shut off — a spare bedroom, a workshop.
Where it helps less: an exterior front door that's already weather-sealed and rarely stands open. If your problem there is a draught round the frame, that's a weatherstripping job, not a curtain.
Picking the size
Measure the opening, not the door slab, and go by the width first:
- Standard interior and exterior doorways — the standard 32″–38″ curtain ($35.99), or the 32×80 draft stopper ($35.99) for a single fixed size.
- If you need to see through it — a garage passage or a room where cutting the light matters — the clear-window version fits 32″–48″ ($35.99).
- Wide openings and double doors — the 72″ curtain ($79.99), or the 72″ version with a clear window ($79.99).
Prices are list prices at the time of writing. If you're unsure how to measure an opening, the measuring guide uses the same method for both products.
Do the swap in one go
Take the screen down, clean it, and dry it fully before it goes into storage — that's the step that decides whether it's usable next spring. Then hang the curtain in the same doorway while you're already up the stepladder. The takedown and storage method is here.
FAQ
Can I leave both up? Not in the same doorway. In different doorways, yes — a screen on a back door you still air out, a thermal curtain on the garage passage.
Will a thermal curtain lower my heating bill? It may help at a specific opening, but treat any big percentage claim sceptically — ours included. The reliable benefit is comfort: one cold doorway that stops being cold. We went into this properly here.
Does it close by itself like the screen does? The door-sized thermal curtains use magnets down the seam and close behind you. Large garage-door-sized panels are a different product and don't self-close — the span is too wide.
What if my doorway is between two heated rooms? Then there's little to gain. The curtain works on a temperature difference; without one it's just a curtain.