I have an air conditioned bedroom. I'd like to prevent heat from entering thru the door. I got door seals for the sides the top of the door, but I can't figure out a good solution for the bottom of the door.

The door is above carpet, so I'm not sure if a vinyl door bottom intended for an outside-facing door is appropriate.

I also saw some "draft stoppers" that go on the bottom of the door, but they are visually conspicuous and have mixed reviews.

Any suggestions? Please remember that this is an indoor door over a carpeted floor.

The gap is quite big: enter image description here

  • I guess the room has a window mounted A/C unit and not a house-wide system? – JPhi1618 Apr 18 '16 at 19:36
  • Correct. The rest of the house is hot. The AC works extra hard to counter the rapid stream of hot air seeping thru the door. – Vivek Maharajh Apr 18 '16 at 19:39
  • You say the draft stoppers (which seem like a good choice to me) are "visually conspicuous". Is being attractive a main goal, or do you want it to be somewhat hidden? – JPhi1618 Apr 18 '16 at 19:46
  • Where is the air going once it enters the bedroom? The "rapid stream" must have an exit according to the laws of the universe. Why is there such negative pressure in a bedroom? – isherwood Apr 18 '16 at 19:47
  • @JPhi1618, insulation is my main goal. Ideally the contraption would be hidden, but I'll settle for anything that is easy on the eyes. I haven't seen any draft stoppers that satisfy this need. – Vivek Maharajh Apr 18 '16 at 20:04

Google "bottom mount door sweep" for any number of inconspicuous options. It appears that your gap is roughly 3/4", which should be fairly easy to fill.

Really, though, I'd investigate why an interior door has so much airflow around it. A window a/c unit should have no trouble keeping up in a single bedroom. You should be able to see your breath.

  • I have updated my post with a picture of the gap. I looked at the door sweeps that you mentioned. I'm not sure if they will work well above carpet - will they? – Vivek Maharajh Apr 18 '16 at 19:57
  • Why not? Vinyl flaps and nylon brushes, properly sized, will skim the carpet just fine, assuming a flat floor. – isherwood Apr 18 '16 at 19:58
  • Concerning your other point - "investigate why an interior door has so much airflow". I suspect that this is because of the ceiling vents. I suspect that hot air thru the house rises up and makes its way thru the ceiling vents. Are these supposed to be shut in summer time? – Vivek Maharajh Apr 18 '16 at 20:45
  • If they're truly vents (to the outdoors), and not return air ducts, then I'd say they should be open in summer and closed in winter. I can't really be sure, though. – isherwood Apr 18 '16 at 20:56
  • They also make door sweeps that snap down when the door finishes closing. – Daniel Griscom Apr 18 '16 at 21:29

A 'door sock' will do the trick. A tight cold room can also introduce an abundance of condensation development inside the wall cavity leading to mold growth.


Look for something called an automatic door sweep. These are devices that have a spring loaded sweep which raises when the door is opened. When the door is closed a cam is activated which drops the sweep.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.