https://www.alpinehomeair.com/hc/calculator/heating_estimator.cfm

The heating capacity of a furnace is measured in thousands of BTU (British Thermal ... This is the proper and scientific method for calculating AC size taught to ...

https://www.acdirect.com/gas-heat-learning-center-furnace-sizing-calculator

Then, to calculate the output on a given gas furnace, multiply it's efficiency rating by it's listed input rating to determine the actual Btu output of heat. For example ...

http://www.oasiscooling.com/blog/furnace-size-estimator/

Sep 27, 2018 ... To avoid these headaches, follow our detailed guide on how to accurately calculate the furnace size that is most suitable for your home.

https://hvacdirect.com/sizing-air-conditioner-and-heater.html

Learn how to size your air conditioner or heater - This System Selector will help you ... Next, if you need to calculate the output you need on a gas furnace, simply ...

https://www.furnacecompare.com/perl/estimate_heat_loss.pl

Sizing Calculator. The following technique can provide you with an approximate size estimate for your new furnace or central air conditioner. Although you may ...

https://www.inchcalculator.com/calculate-many-btus-needed-heat-home/

A more efficient furnace will output more BTUs of heat than a less efficient furnace with the same BTU ...

https://www.hunker.com/12613355/how-big-of-a-furnace-do-i-need-for-a-1600-square-foot-house

Jul 30, 2018 ... When calculating the size of a new furnace, many factors must be considered. ... Gas or oil furnaces typically don't reach 100 percent efficiency, ...

https://www.wikihow.com/Calculate-BTU-Per-Square-Foot

Jun 11, 2019 ... The British Thermal Unit (BTU) is the basic measure of heat energy ... The capacity of furnaces and air conditioners is given in BTUs per hour.

https://www.calculator.net/btu-calculator.html

Two free calculators estimate the number of BTUs needed to cool or heat a room or ... and contrasted; for instance, one of the most popular is natural gas to oil.

https://homeguides.sfgate.com/estimate-gas-furnace-size-20739.html

Dec 29, 2018 ... Getting the right sized gas furnace requires a combination of knowing the proper criteria and the experience to put the information into a ...