Quote:
Originally Posted by Ray
500 square ft. per ton is normal. 400 sq. ft. per ton for higher effenciency.
The wife is retired. The husband works away from home all day.
After Rita, they went to a ridge cap instead of turbines. They have 6 inchs
of pink rolled in insulation. It is an older house, built around the same time
as mine.
They do have the older hard metal ducts. They do lose some effeciency
due to the heat and insulation in the attic. Filters are clean.
I have 3 turbine vents and they have a ridge cap vent system. My attic is
20 deg. cooler than theirs.
I have ceiling fans in 3 bedrooms, living room and kitchen. They have 3 total.
I also have 3 gable vents, they have a hip roof.
They have no kids at home.
The cool air coming out their vents is the same as the temps. coming out of mine.
My a/c is a 10 seer installed in 2003. Theirs is a 14 seer installed last year.
THe a/c puts out, the house is just not insulated like it should be, I guess. It is
putting out 55 to 58 degrees closer to the unit, but it is putting out 69 deg. at
the fartherst register from the unit. Looks like they are loosing some cool air due
to the metal ducts with old insulation in the hot attic.
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6" of roll insulation is less than min. recommended amounts now days.
20 deg is a lot of difference. You have several shad trees....I guessing this other house is not shaded very much but the lack of good ventilation could be the major factor. Another thing that could be a problem....is when the ridge vents were installed, did the contractor cut [or install] the roofing plywood with a big enough gap to allow good air flow through the ridge vents?
It sounds like they need to spend some money to get their house more efficient.
Obama may even pay for most of it.
A 10 deg difference in duct outlet temp. is a lot. Did the A/C men check to see if this "hotter" duct has the same air velocity coming out? The insulation inside this duck may have come loose, blocking the air flow and not getting cooling to that part of the house. A replacement [round] duct is not that expensive.
Just a guess.....but I bet there electric bill is $ 30+ a month more than your's and the houses/living style is about the same.