DLT $*$ HDD $*24=100,000**5357**24=12856800000($Constant for all conditions$)$

$hs=\%$ efficiency

a$)$ Natural gas $(80\%$ efficiency$)HV=103,000Bt\frac{u}{C}CFb$

b$)$ Natural gas $(92\%$ efficiency$)$ HV $=103,000Bt\frac{u}{C}CFb$

c$)$ Liquid petroleum gas$/$propane $(80\%$ efficiency$)HV=91,000Bt\frac{u}{g}al$

d$)$ Fuel oil number $2(78\%$ efficiency$)HV=140,000Bt\frac{u}{g}al$

e$)$ Electricity, resistance heating $(100\%$ efficiency$)$ HV $=3,413Bt\frac{u}{k}Wh$

f$)$ Wood $($pine$)(50\%$ efficiency$)$ HV $=6000Bt\frac{u}{l}b$

g$)$ Coal $(60\%$ efficiency$)$ HV $($Anthracite$)=14,200Bt\frac{u}{l}b$