# Calculator

### Geothermal vs Conventional Heating and Cooling

When your geothermal system is installed and operating, you have a fully integrated, single-source home energy system. There is no tank to fill and only one energy bill to pay. A single unit provides both heating and cooling. And, you have the peace of mind that comes from a totally combustion-free home.

## Savings Intro

To compare heating systems (apples to apples) you need a common denominator. We have choosen to use "1 million BTUs" because many homes use between 45,000 - 85,000 BTUs per hour on a very cold winter day, which is just over a million BTUs per day (about 125,000,000 BTUs per year).

Because each system uses a different fuel type we need to know how many BTUs a unit of fuel contains (A). Then, using efficiency ratings of each system (B), you can calculate the number of units required to create 1 million BTUs (C), which is used to compare costs (see calculator/next tab).

A
B
C

#### Units Required 1 million BTU

#2 Fuel Oil

Gallon
138,000
65%
78%
84%
92%
11.15
9.29
8.63
7.88
Natural Gas
Therm
100,000
65%
78%
84%
92%
16.7
14.3
12.5
11.1
Propane
Gallon
90,000
65%
78%
84%
92%
17.5
15.0
13.1
11.6
Electric
Baseboard
kWh
3,413
100%
293
Air Source
Heat Pump
kWh
3,413
293 / 2.5 COP (Warm Climate)
293 / 1.8 COP (Cold Climate)

117.20
162.78

Geothermal Heat Pump
kWh
3,413
293 / 3.9 COP (Warm Climate)
293 / 3.4 COP (Cold Climate)
293 / 4.2 COP (Hydronic)
75.13
86.18
69.76

Heat Pump efficiency is measured as Coefficient of Performance (COP). For instance a baseboard electric heater has a COP of 1 (it is 100% efficient). Geothermal Heat Pumps in the Northeast have COPs of 3.4 or higher (depending on system design and performance).

## How to Use This Calculator

To generate 1,000,000 BTUs simply enter the units required and the cost per unit of fuel.

#### Type of Fuel

Units Required per M from Col C - upper table
Price per Gallon of Fuel or kWh

Cost per Million BTUs (\$)

Fuel Oil
Natural Gas
Propane Gas
Electric Resistance
Air Source HP
Water to Air Geothermal HP