What Size Gas Furnace For 1800 Sq Ft House

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.

What size gas furnace for 1800 sq ft house. 63 000 to 126 000 btus. 160 square feet. For example if a furnace is rated at 100 000 btus and is 80 efficient then the heat output will be 80 000 btus 100 000 x 8. In the above case an inverter generator with 2 200 starting watts and 1 800 running watts such as honda eu2200i could run the 10 000 btu ac.

If your home is an all electric home and includes electric appliances like an electric range electric clothes dryer electric water heater. Furnaces have come a long way in efficiency over the past few decades. The best way to determine the perfect hvac unit size is to have a manual j calculation done for your house. 550 square feet.

45 000 to 90 000 btus. I have a 20 year old air conditioner that should be replaced. A more efficient furnace will output more btus of heat than a less efficient furnace with the same btu rating. X 15 ft 300 square feet.

260 square feet. How big a furnace should i get for a 1800 sq. Determine how many btus of heating and tons of ac you need. A high efficiency furnace generating 100 000 british thermal units btu with a 93 percent rating will produce significantly.

The furnace is 12 years old so i will consider replacing that too. 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. 70 square feet. 54 000 to 108 000 btus.

As you can see the btu usage recommended for each house size is not a single number but rather a broad range so square footage alone is not. 1900 square feet x 40 heating factor from the chart above 76 000 btu required to heat your home. 72 000 to 144 000 btus. Furnaces are rated on their btus of energy consumption not their btus of energy output.

96 square feet. However you won t be able to use a generator with 2 000 starting watts and 1 600 running watts to power it even though it meets the running wattage requirements. The manual j. X 12 ft 300 square feet.

A heating degree day calculation using the month of july as a factor is a more precise way of estimating furnace size. Natural gas for a furnace is priced by the therm or per 100 000 btus.