When is a door not a door? When it’s a-jar……

Why do I still remember the old puns my parents told me? Anyhow, in this energy conservation age, thermally efficiency wise, a door is not really a door in the energy saving sense, when it is a-jar as, unless it is shut, as obviously, when open it will let out all the energy that has been generated by the property’s heating system.

A door is also not a door when it is a-jar in the security sense, either, as it is designed to provide access and egress for the property’s owner(s), visitors and guests. You don’t find many UK households today who leave their front and/or back doors unlocked at night! I do know a few who do risk leaving them open during the day,…