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Sorry if this long story, but Im out of ideas so figured id check online. Summary: roughly 1200sq/ft home, oil furnace with forced air, also have central air with heat pump
So back in early December I ran out of oil what seemed quicker than we should have. Calculated it out to about 4gal/day. In the 10+yrs I've lived at this house its always been about 3gal/day in winter short of extreme scenarios. So called to get the furnace serviced and diagnosed as it had been a couple years, figured it couldn't hurt.
Christmas Eve they serviced it, new filter, nozzle, "tune-up". The tech said there was nothing actually wrong per say but should definitely be running better. We were almost out of oil at this time. Got 100gallons of oil on 12/27, 1/10 we were out of oil again. Thought that's odd, got another 100 gallons, out of oil again on 1/27. Now I panic, do some math and try to wrap my head around how its now over 6gal/day.
Everything seems to be working fine otherwise. Call the place that serviced it, they insist there is nothing they could have done to aversely effect oil usage other then since everything is new, its flowing better, therefore using more oil. To me that makes no sense because if the system is supposedly more efficient how is it using more oil to accomplish the same thing(technically its doing less as we put the t-stat down to 65 from the normal 68 when we started seeing these issues). The offer to have someone come and double check it for only the dispatch fee of $100. Being I have no other option than throwing twice as much money at oil I agree. Of course they find nothing wrong.
Neither the tech of the person I dealt with on the phone could give any explanation a second time other than the using more oil cause its flowing better idea. This obviously seems ridiculous to me because if that was the case why did it never use this much previously after being serviced? Also if that was the cause why would I bother ever getting it serviced since it worked fine and saved me oil usage theoretically.
So now I have talked to two other hvac companies and a friend that used to do hvac for a living before getting a promotion. They all think 6gal/day is definitely excessive for a house/system of our size, especially after just being serviced. A side note to this is the heat pump which runs above 40deg outside as well as a wood stove we have that will easy keep it warm enough to not need to run the furnace at all. During this time of excessive oil consumption there were a couple days over 40deg as well as two weekends of using the wood stove during the day while home, but didn't even include those in the calculation so technically its over 6gal/day usage.
Is there anything I can check/confirm to make sure they didn't screw something up? Im out about $800 in December/January from the extra oil usage, service/cleaning, follow up call, etc. And would love to resolve this before repeating itself in February.