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100,000 BTU Gas Furnace

100,000 BTU Furnace FAQs

How many square feet will a 100k BTU furnace heat?

A 100,000 BTU gas furnace unit provides heating coverage for areas of up to 4,500 square feet. To warm a square foot in a mild to warm environment, you'll need between 25 and 30 BTU of heat. To figure out how many BTUs you'll need, measure the length and width in feet of your room or rooms. The square footage is then calculated by multiplying these figures. To calculate the total square footage of a building with several rooms, repeat the procedure and add the products together. 

For smaller spaces, a 60,000 BTU furnace or 80,000 BTU furnace may be more cost-effective. 

Should I buy a 80% or 95% efficiency 100k BTU furnace?

When industry professionals refer to a high-efficiency gas furnace, they usually mean furnaces with a 90% AFUE rating or higher, as they are more efficient and waste less fuel. So, when shopping around for a furnace, noting a high AFUE rating is a good way to identify a furnace that’s likely to save you money in fuel costs in the long-run. 

In order to understand how furnace efficiency works, it’s important to know how it is measured. Furnace efficiency is measured by a unit called AFUE. AFUE stands for Annual Fuel Utilization Efficiency. A furnace’s AFUE rating informs you about what percentage of the furnace's fuel is used during operation and how much of it is lost through exhaust. For example, if you read that a gas furnace has an 80% AFUE rating, you can understand that 80% of the furnace's fuel is consumed as it works, and that 20% is lost through exhaust.

How much does a 100,000 BTU gas furnace cost?

A 100,000 BTU heater can cost between $800 and $2,400, depending on the specific model that you’re shopping for. Note that higher AFUE efficiency can save money over time, which is an important factor to consider when calculating long-term cost-effectiveness. 


If you have further questions about heater efficiency, be sure to ask a technician, who will be happy to help.

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When you need a larger area heated, a 100k BTU furnace is often the best solution. From large houses to bigger office spaces and stores, a 100k BTU furnace will help keep the area toasty and cozy at an affordable price.

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