I have had almost zero oil usage all winter from my prior system. Mitsubishi's performed flawlessly. I set my oil system to 50 and the Mitsubishi's to 60. Only on a very few very cold nights below zero did I see my oil system run. The following data might be useful.....
Below is the daily KWH consumption...this year vs. last.
Nov 5, 2012 6.933 Nov 5, 2013 8.286
Dec 5, 2012 3.364 Dec 9, 2013 33.118
Jan 5, 2013 3.567 Jan 9, 2014 53.968
Feb 5, 2013 4.333 Feb 10, 2014 49.219
Mar 5, 2013 3.750 Mar 10, 2014 51.036
Apr 5, 2013 3.452 Apr 8, 2014 47.034
Electricity cost increases......based on daily KWH demand & days n billing cycle
Nov. '13 $5.05 (low...system installed Oct. 30)
Dec. '13 $134.80
Jan. '14 $208.19
Feb. "14 $191.39
Mar. '14 $176.42
Apr. '14 $168.42
Total = $884.27 cost increase for electricity. If I divide this by the average cost of oil of about $3.79/gallon, I get 233 gallons of oil equivalent for the increased cost of electricity. Last year, I bought 328 gallons of oil during the same period for a WARMER winter. So I guesstimate my savings are in a range of about 25-30% less EQUIVALENT oil usage.....not bad in a very cold winter. My house is over 2000 sq. ft with excellent insulation, great windows, and a fairly new three pass heating system (8 years old and it sipped oil). Saving about 100 gallons of oil per season isn't bad, but the payback does take a while. Remember, my prior system was very efficient. But the benefits are hard to refute. Our system was installed for the AC benefits and the heat pump benefits were a lucky strike extra. Top notch system installed by top notch team from Home Energy.
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