Jim's right- I was making fun of the rule of thumb presented in an earlier post.
Your true number of 14BTU/ft makes my point- those BTU/ft rules of thumb (in this case 35 BTU/ft had been presented) reliably oversizes real loads, often by more than 2x, which is why you should NEVER use them. Old skool heating contractors like them though since it means they never have to actually think about it, and it's never undersized, avoiding the 6AM call from the irate freezing client. But it's the client that pays- more up front for the larger unit, and lower efficiency/higher maintenance down the line as it short-cycles itself into an early grave.
Your true number of 14BTU/ft makes my point- those BTU/ft rules of thumb (in this case 35 BTU/ft had been presented) reliably oversizes real loads, often by more than 2x, which is why you should NEVER use them. Old skool heating contractors like them though since it means they never have to actually think about it, and it's never undersized, avoiding the 6AM call from the irate freezing client. But it's the client that pays- more up front for the larger unit, and lower efficiency/higher maintenance down the line as it short-cycles itself into an early grave.
