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answers.yahoo.com/question/index?qid=20061116220710AAFNyOE

An older 65% efficient 75,000 BTU furnace can only deliver 48,750 BTU of heat to the space, while a newer 92% efficient furnace can deliver 69,000 BTU of heat to the space. When sizing a furnace, you need to calculate how much heat is being lost from the home. There are a number of variables that can affect heat loss.

homeguides.sfgate.com/average-btu-furnaces-88602.html

There is a specific size of furnace that will be best suited for your home, and the BTU rating of your furnace will be specific to your home’s Manual J Load ratings, so only one BTU rating will ...

homeguides.sfgate.com/many-btus-furnace-need-house-100318.html

4 Measure the BTUs for the Size of a House; A BTU is a British Thermal Unit, or a measure of thermal or heat energy. BTUs are used to determine thermal energy output in a variety of devices ...

www.reference.com/home-garden/size-furnace-house-25ae0003cb3f12d6

How Do You Size a Furnace for a House? There are several factors to consider when sizing a furnace for a house, including the square footage of the building and the climate it occupies. A rule of thumb is to allow 25 to 30 BTU per square foot for moderate climates and up to 45 BTU per square foot in harsher climates.

budgeting.thenest.com/many-btus-furnace-need-house-26529.html

How Many BTUs Does a Furnace Need for a House? ... For example, an older furnace rated for 100,000 input BTUs at 75-percent efficiency has 75,000 output BTUs. A newer, higher-efficiency furnace might have a lower rating for input BTUs, but still put out the 75,000 output BTUs you need. ... Selecting Furnace Size (BTU) Don Vandervort's HomeTips ...

www.alpinehomeair.com/viewproduct.cfm?productID=453064680

The maximum amount of heat that the unit can produce. The amount delivered into the space will be the input minus the efficiency loss also know as the output. For example a 100000 btu furnace at 80% efficiency will give you 80000 out btus of heat. The same size furnace at 95% will give you 95000 btus of heat.

www.homedepot.com/b/Heating-Venting-Cooling-Heaters-Forced-Air-Furnaces/...

Shop our selection of Natural Gas, Forced Air Furnaces in the Heating, Venting & Cooling Department at The Home Depot.

www.ebay.com/sch/i.html?_nkw=75+000+Btu+Rheem+Gas+Furnace

Save 75 000 Btu Rheem Gas Furnace to get e-mail alerts and updates on your eBay Feed. + Items in search results. RHEEM-RUUD RGRL-07EMAES 52,500/75,000 BTU 2STAGE UPFLOW NATURAL GAS FURNACE 95%. Brand New. $840.00. or Best Offer. Freight. 24 Watching.

www.hvac.com/shop/shopby/gas-furnace/75,000-btu

Rheem RGPE-07EAMKR - 75,000 BTU, Up To 80% AFUE, Upflow / Horizontal, Two Stage, Variable Speed Gas Furnace - DISCONTINUED View Product Rheem RGPQ-07EAMER - 75,000 BTU, Up To 80% AFUE, Upflow Only, Two Stage, Multi-Speed Gas Furnace - DISCONTINUED

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