Heat Pump Revisited
Topic: Indianapolis Living
Last month, the heat pump system in our house went out (see previous article for details). Since that time I have been waiting to get some proof of how efficient this new-and-improved system is. Sick fascination with the numbers? Yes, and I'm fine with that. Earlier this week, I got my electricity bill and the number crunching began...
Since we haven't been in our new house a full year, I wasn't able to make an apples-to-apples comparison of last month's bill against last year's bill for the same time period. I do have the bill for two months ago, plus some old data from our previous house which was on a gas heat system. With that, I can make some apples-to-oranges comparisons.
The first month's electricity bill using the new system was $131.81. This is a difference of $16.48 over the previous month's bill of $148.29. The weather.com site tells me that February's average temp of 30°F of Indy is a bit colder than March's average temp of 40 °F. Time will tell if the month-to-month difference in our electricity bill is purely seasonal, or if the difference is partially coming from the efficiency of the system as well.
A little historical data, our old house used a gas furnace; all other appliances were electric. Total energy costs for Feb and March the past three years :
Year March Feb 2002 - $196.90 $268.01 2003 - $290.88 $314.83 2004 - $213.96 $300.23
Average February energy cost for old house: 294.36
Average March energy costs for old house: $233.91
Since our new house is "all electric", our total energy costs are completely contained within the electricity bill. Looking at our historical monthly numbers above, it is clear that our new house's total energy cost is radically less than our old house. Great news.
Although a heat pump system is pricey to install, its operating costs are much less expensive than a gas furnace. More data is needed to determine if the new heat pump is that much more efficient than the old one.
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