how many sq ft house can a 75,000 btu furnace heat?

Question

I have a 2 story, 2x6 constructed house in norther NM

Answer 1

In New Mexico, in a fairly well insulated home, about 2083 square feet.
Too many variables, like insulation rating, square foortage of windows, type of windows, etc. Here is an online calculator though:
http://www.hvacopcost.com/equipsize.html

Answer 2

This Site Might Help You.

RE:
how many sq ft house can a 75,000 btu furnace heat?
I have a 2 story, 2x6 constructed house in norther NM

Answer 3

The actual heating capacity of the furnace depends on its efficiency. Furnaces have two heating capacities listed on the nameplate. The first is its input capacity – that is how many BTU’s/hour of gas it is capable of using. The second being its output capacity – that is how many BTU’s/hour of the gas being consumed is actually being delivered to the space for heating. The difference between these two is the amount of heat energy is being wasted as flue gas. A furnace’s output capacity divided by its input capacity is the efficiency.

Furnaces are typically referred to by their input capacity – but the actual heating capacity can be dramatically different depending on its efficiency. An older 65% efficient 75,000 BTU furnace can only deliver 48,750 BTU of heat to the space, while a newer 92% efficient furnace can deliver 69,000 BTU of heat to the space.

When sizing a furnace, you need to calculate how much heat is being lost from the home. There are a number of variables that can affect heat loss. Gare points out just a few in his answer. However, in your area, the 36 BTU’s per square foot is a reasonable safe assumption for a ranch home.

Back to your question… a 75,000 input BTU furnace at 65% efficient could heat a home around 1354 square feet, while a 75,000 input BTU furnace at 92% efficient could heat a home around 1916 square feet.

Answer 4

Btu To Square Feet

Answer 5

normally 1ton btu can heat are of 100 sq. ft. so by approximation one can say that 75000 btu furnace shall heat about 750 sq. ft. area. However factors like opening sizes, shape of the rooms and height also id important factor.

Answer 6

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Answer 7

There are entirely too many variables to answer........
You need to have a professional conduct a heat loss calculation on the structure for which you intend on heating.


A 75k btu unit may or may not be able to heat your space.
A couple of items to consider:
What is the efficiency rating of the unit?
Orientation of the house?
ductwork sizes?
heat loss vs. heat gain?
solar gain?
insulation value?
building construction?
Glass?
Livable space (sq.ft) trying to heat?
Outdoor temp?

Please provide further details and we may be able to aid in the correct selection.

Newt

Answer 8

Mine is a single story in Southeast Michigan, we have mild winters. I just put in a new boiler for radiator heat. I have 900 sq. ft. Sliding glass doors, two entries and jealousy windows, one two by four in each room, a basement that's heated for our workshop (We make quilts) and my workshop separated by a door, no kids ruining in and out. They tried putting in a 115 K I told them "No" I'm retired from construction business after forty years, I know what I'm saying. I told them the 80K boiler. It works beautiful, the second year. Ten below and it wasn't even working. Hope this helps.

Answer 9

about 600 sq ft