What Size Gas Furnace Do I Need For 1800 Sq Ft House

For cooler climates a very broad estimate of furnace sizing is to select one that generates 40 to 45 btus per square foot.

What size gas furnace do i need for 1800 sq ft house. The furnace is 12 years old so i will consider replacing that too. Btu charts furnace output and air conditioner size for a bungalow bungalow area sq ft furnace output btu hr air conditioner size ton built after year 1980 built before year 1980 built after year 1980 built before year 1980 up to readmore. I have a 20 year old air conditioner that should be replaced. But there are a lot of details to consider in the process.

I don t want to pay more than i have to so i wonder what the norm is for the size of a furnace air conditioner for an 1800 sq. A mid sized home of 2 000 square feet would need approximately 50 000 to 60 000 btu to heat it properly. Gas or oil furnaces typically don t reach 100 percent efficiency while electric furnaces often do offer 100 percent efficiency. 2000 square feet x 40 heating factor from the chart above 80 000 btu actual output.

This furnace would be suitable for say an older home in atlanta or los angeles and would be more than sufficient for a new home with good insulation. How big a furnace should i get for a 1800 sq. For example if a furnace has a listed input rating of 90 000 btu s and an efficiency rating of 80 it will produce 90 000 btu input x 80 efficiency 72 000 btu actual output. Gas is the most common heating fuel.

A gas furnace in the 1970s had an efficiency rating of about 65 percent. 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. At 40 to 45 btus per square foot you d need a 100 000 to 112 500 btu. If you find a furnace with 90 000 btus and an 80 percent efficiency rating your output will be 72 000 btus.

And if you re in need of a new furnace now is the time to act. Next if you need to calculate the output you need on a gas furnace simply multiply its efficiency by its listed input rating for the btu output of heat. If you get the sizing wrong you will have a hard time escaping winter s chill and or your energy bill. You need to purchase the right size furnace to heat your home effectively and manage your energy costs.

With a less efficient furnace operating at 80 percent efficiency this would require a. Today regulations require that new furnaces must offer at least a 78 percent efficiency rating and some. But the average homeowner can t simply go out and buy just any furnace. Determine how many btus of heating and tons of ac you need.

Figuring out an accurate hvac size involves 2 basic steps.