# what is the formula....

Originally Posted By: five.five
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for calculating the required BTU’s for a certain square feet in a house?

Thank you

Originally Posted By: jbehling
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Did you not get any books with the home inspection courses you took? You did take courses?

Originally Posted By: cbottger
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Some contractors use 400 some use 500 square feet of living space per ton of cooling such as 1500 sq ft home uses a 3 ton unit. The proper way would be to run a heat load on the home such as amount of insulation walls and attic, type of windows, doors ect. ect. ect. The average daily high temperature for the summer summer months for your particular area is also very important and the amount of humidity on a average.

Don’t argue with an idiot someone watching may not be able to tell the difference.

Originally Posted By: phinsperger
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Required BTU’s = Total heat loss - Total heat gain

then you have to determine each. By such things as glazed area, insulation, number of anticpated occupants, location, etc, etc. I can go a bit more in detail if you like but sufice it to say there are a number of factors and assumtions that equate in to it. There is software that will calculate it for you. All you have to do is plug in a few numbers.

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Paul Hinsperger
Hinsperger Inspection Services
Chairman - NACHI Awards Committee
here !

Originally Posted By: jbehling
This post was automatically imported from our archived forum.

 cbottger wrote: Some contractors use 400 some use 500 square feet of living space per ton of cooling such as 1500 sq ft home uses a 3 ton unit. The proper way would be to run a heat load on the home such as amount of insulation walls and attic, type of windows, doors ect. ect. ect. The average daily high temperature for the summer summer months for your particular area is also very important and the amount of humidity on a average.

As stated, a heat loss calculation has to be performed for a proper answer. Most contractors over size heating and cooling units, wasting energy and money.

Originally Posted By: cmccann
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http://www.alpinehomeair.com/Furnace-choosingsize.cfm

http://www.hvacopcost.com/equipsize.html

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NACHI MAB!

Originally Posted By: phinsperger
This post was automatically imported from our archived forum.

.

Paul Hinsperger
Hinsperger Inspection Services
Chairman - NACHI Awards Committee
here !

Originally Posted By: five.five
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this board has not gotten a lot of posts lately, and I am asking questions that may help me, and others.

Thanks to those who answered legitimately.

Originally Posted By: jbehling
This post was automatically imported from our archived forum.

 five.five wrote: this board has not gotten a lot of posts lately, and I am asking questions that may help me, and others. Thanks to those who answered legitimately.

It was a joke, relax. ![icon_confused.gif](upload://qv5zppiN69qCk2Y6JzaFYhrff8S.gif)

Originally Posted By: sbyrnes
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five.five,

you should see the members only section, posts like you wouldn't believe!! nudge, nudge, hint, hint.

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All Corners Home Inspections, Inc
Serving Pasco, Hernando, N. Pinellas & N. Hillsborough counties

Originally Posted By: Gary Reecher
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Just for fun a free airconditioner sizer

http://www.hvaccomputer.com/hvac/sizer.asp

Actually Don Sleeth takes the time to describe heat loss/gain and why proper equipment sizing is important.