“My door is always open. Hence my massive heating bill” is a joke that was posted on Twitter on April 14, 2010. A similar joke was posted on Reddit—Jokes on December 20, 2014:
   
“My landlord wanted to come talk to me about the high heating bill. I told him, ‘My door is always open.’”
   
       
Twitter
Matthew Crosby‏
@matthewcrosby
Replying to @HelenZaltzman
@helenzaltzman my door is always open. Hence my massive heating bill. #outofonecrapjokefryingpanintoacrapjokefire
6:46 PM - 14 Apr 2010
   
Twitter
Cody Hall‏
@2Cold2Behold
My door is always open…your heating bill must be outrageous
7:48 PM - 19 Mar 2013
 
Reddit—Jokes
My landlord wanted to come talk to me about the high heating bill
submitted December 20, 2014 by DrDalenQuaice
I told him, “My door is always open”.
 
Reddit—Jokes
My landlord says he needs to come talk to me about how high my heating bill is
submitted October 20, 2017 by DrDalenQuaice
I told him, “My door is always open”.
 
Twitter
Joke Roller‏
@JokeRolling
My landlord says he needs to come talk to me about how high my heating bill is.
I told him, “My door is always open”.
4:20 PM - 20 Oct 2017