How many BTU furnace do I need for 1700 square feet?
Chloe Ramirez
Updated on April 03, 2026
How many BTU furnace do I need for 1700 square feet?
Using this information, you can get a rough estimate of your required furnace size based on your home’s square footage. The average Kansas City home, which is around 1,700 sq. ft., will need a furnace rated at 68,000 to 78,500 BTUs per hour. Your heating degree day can also provide a rough estimate.
How many BTUs do I need per square foot?
For example, if the bedroom and office area zone is 1,800 square feet and the living areas and kitchen are 2,400 square feet, add together the recommended BTUs for each. You’ll need between about 180,000 and 280,000 total BTUs for your home based on the climate and house factors considered in the calculator.
How big of an AC unit do I need for 850 sq ft?
Hello Ruth, for 850 sq ft you would need a 17,000 BTU device and 6,000 BTU device for the 300 sq ft room. The best option would be to use a 2 zone mini split AC unit (1 outdoor unit with 2 indoor units, one in each room). 2 zones should have a capacity of 17,000 BTU and 6,000 BTU respectively.
How big of a home do you need for 800 square feet?
For instance, if you live in a home that’s 800 square feet, you’ll need a unit with 16,000 BTUs. On the other hand, if you live in a 5,000-square-foot home, get a unit with 100,000 BTUs.
How many BTU does a square foot furnace use?
A furnace that is too large will waste energy and create warm spots at grates near the furnace before the cycle ends. The generally accepted BTU per square foot heating rule of thumb ranges from 30 BTU per square foot to 60 BTU per square foot.
What is the formula for BTU?
Many techs are familiar with the temperature rise formula for checking airflow. It is derived from the specific heat formula: BTU = weight x ΔT x Specific Heat.
How do you calculate BTU per square foot?
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 to calculate BTU load?
How to Calculate Heating Load Calculate the Area BTU using the formula: Area BTU = length (ft.) x width (ft.) x 31.25 Calculate the heat contribution from the solar heat radiating through windows. Determine the number of occupants that normally occupy the space. Locate all of the equipment and appliances that occupy that space such as computers, printers, appliances, etc.
How many BTUs per square foot?
Establishing the Correct Heating Capacity. Depending on where you live, the BTUs per square footage you require vary. Warmer climates need only 30 to 35 BTUs for every square foot while colder climates require 50 to 60 BTUs.