To help future furnace owners out, we have developed a simple furnace sizing calculator. You only need to know two things; your home square footage and the climate zone you’re in. After the furnace sizing calculation, you’ll find how the size of the furnace is calculated.

2025年2月4日 · We take the size, climate and insulation value, and give you the most accurate furnace btu calculation results you’ll find online. If you want to double-check your results against ours, see the Table below that uses average-sized homes in a range of Zones, etc.

This furnace size calculator, or furnace BTU calculator, will help you determine what size of furnace you need for any room area, insulation type, or outdoor temperature. With our tool, you will learn how to calculate furnace size for a house and what BTU is in heating.

2025年1月29日 · Our furnace size calculator can tell you how many BTUs your furnace should be. Finding the right size furnace depends on where the house is located, how many square feet it is, and the age of the home’s windows and insulation.

2025年1月2日 · The HVAC size is 2.5 to 3 tons for the AC and 70,000 BTU for the furnace. That’s in Zone 4 – a zone with average temperatures. However, to get exact HVAC sizing for your home, fill out all the details in the calculator.

Use the Gas Furnace sizing calculator below to calculate your required central heating system Btu size. Follow these easy steps: Select the region you live in according to the color keyed map below. Enter the approximate square feet of the area in your home that you need to heat/cool. Click the Calculate System Size button.

Calculating furnace size is vital for maximizing the energy efficiency of your heating system. Read more to answer questions like “What size furnace do I need for my house?” and “How big of a furnace do I need for small rooms?”. Click here to learn about factors to consider when choosing a …

Use our quick and free furnace size calculator to get an estimate on your new propane or natural gas furnace’s recommended size & BTU output. Get a quick idea of the ideal furnace heating capacity for your home with this FREE calculator!

Most furnaces are offered in 15,000-20,000 btu increments so you just need to get close in terms of sizing. If the furnace you selected is more than 10% below your heating requirement, we suggest you go up to the next size.

Use our free furnace size calculator to determine the right furnace BTU for your home based on square footage, climate, and insulation.