A 1,500-square-foot home will require between 45,000 to 90,000 BTUs.

How many BTU of heat do you need per square foot?

The general rule of thumb is that you need between 30 and 60 BTUs per square foot, depending on your climate. Climate zones can help you determine how many BTUs per square foot you need.

How many BTUs do you need to heat 1000 square feet?

To determine the number of BTUs per square foot that you need to heat a room, simply multiply the square footage by 20 BTUs per square foot. For example, if a room has 1,000 square feet, you would require 20,000 BTUs to heat it.

How efficient is a 40 year old furnace?

How efficient is the average 35-40 year old furnace? 80% at best. Likely lower if it is indeed close to 40 yes old. A lot of savings to be had with a new furnace 95% with a ecm blower motor.

How many BTUs do I need for a 900 square foot house?

A 100- to 200 square-foot room, such as a small home office, will have an average recommendation of 4,000 to 8,000 BTUs. For a space of 800 to 900 square feet, such as a small home or two-bedroom townhouse, the recommendation is between 30,000 and 45,000 BTUs.

How many BTUs do I need to heat a 24×24 garage?

There is a basic rule of thumb for forced-air heaters, which is to heat a two- to 2-1/2 car garage and a three-car garage with 60,000 Btu.

How many square feet will 18000 Btu heat?

There are calculators available to help homeowners factor the right sized unit, but there are also some rules of thumb that can be followed. For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs.

What size furnace do I need for a 3000 sq ft home?

The general rule of thumb is that you want 40-45 BTUs of heat per square foot of your home. So, if your home is 3,000 square feet, you’ll want a furnace that produces between 120,000 BTUs and 135,000 BTUs.

What size furnace do I need for a 1000 sq ft house?

A basic rule of thumb is that it takes 30 BTUs for every 1,000 square feet. At the most basic level, if you have a 1,000 square foot house, you’ll look for a furnace that has 30,000 BTU output.

How do I size a furnace for my house?

How to Calculate the Right Size Furnace
Calculate the square footage of your home. Find out What Climate Zone Your Home Is In Climate is another factor that helps determine how many BTUs you need to heat your home. Multiply your square footage by 40, the lower number recommended for the climate zone.