Re: How many BTUs

Posted by TomIn on January 09, 2022 at 04:14:26 from (23.118.149.246):

In Reply to: How many BTUs posted by 44 massey on January 09, 2022 at 00:13:29:

An engineer neighbor of mine once told me that HVAC was the most over-engineered part of most construction jobs. Your goal should be to deliver enough BTU's to the area of your building you will be occupying to make you happy. A BTU output has always been a BTU output--regardless of how it was created. George is correct in saying that heat rises and that the air temperature will tend to be higher at ceiling level. Air circulation can minimize this problem, but air movement will tend to make you feel colder. George's solution of is one way to keep the strongest part of the draft from blowing on you while you are working. If you use ceiling fans, they are generally used to move the air upward in the winter so that the strongest draft is along the ceiling rather than where you are standing on the floor.

It is impossible to predict the necessary BTU output from the limited information you have provided. My pole barn is insulated to some degree by a layer of dust on the underside of the roof and the walls. Yours is likely better insulated, but you don't say how well. As George said, you didn't indicate how frequently you heated the shop.

You mention that a dealer has recommended a 105,000 BTU input furnace that has an output of 80,000 BTU. I'm a geezer who hasn't paid much attention to energy efficiency standards for the last decade or so, but I recall that 80% efficiency has been the minimum standard for northern states for many years. It sounds like the dealer is trying to sell you the least efficient furnace on the market --hopefully to justify a lower price than his competition. If you want to save money on fuel costs, consider a higher efficiency furnace or perhaps an infrared radiant heating system. A HVAC professional once told me that you can save a lot of money, as long as you don't care how much it costs.

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