#### ah2bwise

##### Member

We're in the process of a new build and I am trying to determine if it is worth the cost to connect natural gas.

I was hoping you could confirm that my process in calculating this is correct.

**House details:**

- Location: Western NY

- 80'x30' footprint, w/ 10-foot ceilings (2,400 square feet)

- R-38 in the attic, insulation batts in 2x6 walls

- Radiant floor heating on a concrete slab

- Single story ranch

**Heating Demand:**

- 10 BTU/sq ft/HDD

- Heating Degree Days (HDD): 5,866

- Total Annual BTU Requirement: 10 × 2,400 × 5,866 = 140,784,000 BTU/year

**Natural Gas cost:**

- Assumed Efficiency: 90%

- Actual Need: 140,784,000 / 0.9 = 156,426,667 BTU/year

**-**$0.78 per ccf (I averaged my last 3 bills at my current address)

- btu/cu.ft: 1,037

- 156,426,667 / 1,037 = 150,842 ccf per yr

- 150,842 ccf × $0.78 = $1,176 total cost per year

**Electric Boiler cost:**

- Assumed Efficiency: 100%

- Conversion factor: 3,412 BTU/kWh

- Total KW need: 140,784,000 / 3,412 = 41,265 kWh

- Electric cost: $0.175 per kWh (I averaged my last 3 bills at my current address)

- Total Cost: 41,265 kWh × $0.175 = $7,221.38

**Propane cost:**

- Assumed Efficiency: 90%

- 91,500 BTU/gallon

- Annual requirement: 140,784,000 BTU/year / 91,500 = 1,538 gallons

- Propane cost: $2.149 per gallon (local quote just received)

- 1,538 gallons x $2.149/gl = $3,305

It would seem that the cost of an electric boiler is unfeasable.

The cost per ft the gas company quoted me to run a main down our road that doesn't have NG comes out to be around $10,000 total.

So, if my math is correct, it should take $10,000 / $2,129 saved per yr = around 4.7 years to pay for itself.

Is the way I am approaching this correct?

Thank you