If you have a good, well insulated modern door, the storm door is redundant
and in some cases not recommended by the manufacturers of the main door.
This is the case with the steel doors that I have had installed in my house.
Early model mobile homes and travel trailers had the door open outward to
save space in the interior.. But as others have mentioned, it created a
problem with the screen or storm door..
I live in an old '75 mobile home and the entry door presently opens out and
since I have a enclosed porch, the storm door is in the porch entry..
I believe it was a old episode of this old house . They showed a pre fab
house in Sweden which had an out swing ing door . If I remember ,they
said it had to do with weather and heat loss. something about winter
winds pushing against the door helped seal it.
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