Furnace nozzle = 1.0 US GPH = 3.785L/h @ 0.97$/L = 3.7$/h
2008-02-14: Overnight outdoor temperature 6°C, wind avg 20km/h
- The furnace didn't come on overnight.
- At 5:45 it came on for 20 minutes, cycled off, then came back on for about 8 minutes, making a 30-minute burn to go from 19° to 21°. 30 min = $1.85 to warm up the house in the morning.
2008-02-18: Overnight outdoor temp 11°C - 7°C. Wind avg 4km/h, gusting to 30.
- Furnace didn't come on overnight
- 5:45: Burner: 0.17h --> 8-minute --> $0.61
2008-02-21:
- Evening: no wind; house at 21°C, outdoor -8°C; 9-minute burn every 2 hours.
- Overnight: average outdoor -9°C, two 9 minute burns
- Morning: 29-minute, 12-minute, 10-minute burn totalling 51 minutes
"Overnight and Morning" burns are in minutes.
| Date | Outdoor °C | Wind | Overnight | Morning |
| 2008-02-14 | +6 | 20 | none | 2, total 30 |
| 2008-02-18 | +9 | 4 | none | 1, total 8 |
| 2008-02-22 | -9 | 0 | 2 x 9 | 3, total 51 |