I agree about the making sure it is an actual amount.
However...it was explained to me by a friend of my grandmother, who has been in the heating/cooling business for 50 years, how the new "high efficiency" furnaces actually sometimes cost more to run than older models. The newer ones put out heat that is barely warm...unlike the older ones which chug out really hot air. The whole purpose of the new ones is to keep a constant, even temperature....so they run more frequently, putting out barely warm air, in order to keep the temperature a constant temperature....whereas my old furnace, when it is on, chugs out massively hot air, then shuts off..then over time, my house cools, it gets triggered to turn on again, etc...so the tempo in my house fluctuates up and down several degrees....but my furnace actually runs a lot less, both less frequently and for shorter periods of time, than a newer furnace which is trying to keep the temperature perfectly even all the time...does that make sense?
also...sometimes it just doen't make sense at ALL..seriously.....my house, which is ancient, 1920's, with NOTHING high efficiency, the windows leak like sieves, the dorrs have whole half-inch lines where they don't match up and let air in and out....there is NO insulation in the entire darn house.....and we heat it as much as we want, all day every day ( and it's been -15 most of the week) And we pay $100 per month. Other people in our same town, with much newer houses, are paying 3-4 times that. *shrug*