Had a zoned Water Furnace Series 7 system recently installed here in lower MI. The house is 2200 sq ft from '67, not the most efficient (half the windows have been replaced in the past year, still making improvements), panel roof, the first floor is 4'-6' below grade, and the living room is open to the 2nd floor with 26' ceilings. It's been a fairly mild winter, but even at that, the system seems to have a difficult time heating it. In 32F temps (maybe even up to the low 40's) the system never shuts off. It runs for a solid 24hrs each day. If I move the stat from say 68F to 70F it might take 6hrs to move it two degrees, or maybe it won't be able to at all. Also, no matter what the stat temp is set for the room temp will never reach that number. Even on the warm day the room temp will be 1 degree off. Using the stat as my billing system (power company still has not installed the meter yet after 4 months) it looks like I'm using in the $5-$6 range per day. Does that sound right? The "electric heat" does come on every day per the stat history. The contractor is coming back again to look at things, will be the 3rd time. I just need to hear from someone else on what I should be expecting. Thanks!