How Much Will It Save?
A guide showing heating savings using
a GHP system.
How much will it save?
As mentioned in the fuel cost comparison, heating savings depend upon the particulars of your case. An exact answer requires a sophisticated computer simulation. To provide a guide, the following data was developed (Kavanaugh, 1992a; Kavanaugh, 1992b) for three U.S. locations with widely differing climates. The values shown are annual kWh consumption for the different system types.
These figures are based on newly constructed homes conforming to local energy efficiency standards (which are much more stringent in the northwest portion of the country). GHPs are assumed to be equipped with desuperheaters for hot water heating. The balance of the water heating is by electric water heaters.
Additional savings information is available from the sources listed on page 22. The U.S. EPA report, "Space Conditioning: The Next Frontier" by L'Ecuyer and others (EPA 430-R93-004) also contains savings information.
| Atlanta GA |
| kWh Cooling |
kWh Heating | kWh DHW* |
kWh Total |
|
ASHP |
3,409 | 7,396 | 4,120 | 14,925 |
| ASHP (variable speed) |
2,499 | 5,540 | 4,120 | 12,159 |
| GHP (std. eff.) |
2,599 | 4,236 | 2,620 | 9,455 |
| GHP (high. eff.) |
2,079 | 3,510 | 2,509 | 8,098 |
* DWH= Domestic Hot Water
| Spokane, WA |
| kWh Cooling |
kWh Heating |
kWh DHW |
kWh Total |
|
ASHP |
773 | 11,475 | 4,120 | 16,458 |
| ASHP (variable speed) |
435 | 9,295 | 4,120 | 13,850 |
| GHP (std. eff.) |
451 | 5,562 | 3,150 | 9,163 |
| Portland, OR |
| kWh Cooling |
kWh Heating | kWh DHW |
kWh Total |
|
ASHP |
513 | 6,666 | 4,120 | 11,299 |
| ASHP (variable speed) |
285 | 4,706 | 3,150 | 9,111 |
| GHP (std. eff.) |
337 | 3,549 | 3,468 | 7,354 |
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