[Xringer]

Dec 2009
Day, kWh, Temps
1, 9.26, 38
2, 7.23, 44
3, 2.88, 60
4, 5.62, 49
5, 9.17, 36
6, 10.5, 27
7, 12.9, 29
8, 12.2, 29
9, 9.23, 36
10, 8.77, 32
11, 14.2, 23
12, 14.3, 24
13, 12.9, 28
14, 9.95, 37
15, 8.58, 40
16, 10.4, 29
17, 16.9, 16
18, 14.5, 16
19, 11.5, 20
20, 11.5, 21
21, 14.2, 25.3
22, 15.2, 23.3
23, 14.8, 15.2
24, 8.17, 28.7
25, 13.8, 27.1
26, 10.5, 36.2
27, 8.35, 44.6
28, 13.8, 31.7
29, 15.3, 21.0
30, 10.5, 17.0
>>>March, 2010 w/ new outdoor unit<<<
26, 8.56, 38.8
27, 13.9, 26.0
28, 9.37, 37.2
29, 7.05, 49.9


March 30, 2010 note:
On rainy or cloudy days, the power usage will be higher than normal, since there is no solar gain from the south facing windows.


It looks like we spent $67.76 on power for the heat pump in Dec.. (Ave temp 29.9F)

We had an oil delivery on 12-23-09 (see above) but used very little oil in Dec..
(One 1-1-2010, the gauge was still at 7/8. It had dropped to just under 1/2 as of 2/1/2010).

BUT, after the heat-pump broke down, the very cold month of January has been very costly.. (Ave temp 26.9F)
Weather Station History : Weather Underground


The bad news:
Today the oil man delivered 137.4 gallons of oil. $342.12

So, it seems like oil heat cost (in Jan) is about FIVE times more than we paid for running the heat pump in Dec..

According to my quickie calculation, (14 kWh per day x 30= 420 x .201=$84)
IF the heat pump had been working in Jan, it would have cost us between 80 and 90 bucks for electricity . (1/4 oil?)

We do use oil for hot water, so there would have been some oil consumed regardless.


NStar Bill info:
Last month 740 kWh ($150.40) Using Sanyo Heat pump
Current month 615 kWh ($125.93) Using oil heat.
It seems the motors on my oil burner use a good bit of electricity too.
(We have not deployed the old resistive space heaters)..

Conclusion:

A Mini-spit heat pump can save a considerable amount of energy.
(When compared to oil heat).

Once we get the Sanyo working again, I'll be a happy camper..

Note 03/26/2010:
Sanyo is working again!