A. Simply multiply the appropriate factor below in the chart and by your zone from the map by your home's total heated square footage to arrive at your required heating output.
Zone 3= 40 Btu’s per square foot (from the chart below)
Home square footage= 2000 square feet (your calculated total)
Now it is time to do a little math.
2000 square feet
X 40 Btu’ s per square foot
80,000 Btus (actual Btu’s needed)
Heating Square Footage Range by Climate Zone
Red ZONE 1 30 - 35 Btu's per square foot
Orange ZONE 2 35 - 40 Btu's per square foot
Yellow ZONE 3 40 - 45 Btu's per square foot
Green ZONE 4 45 - 50 Btu's per square foot
Blue ZONE 5 50 – 55btu's per square foot
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