Some good help here, thanks.
In terms of the windows, it's a bay window in that room, and was added
about 25 years ago (according to the date stamp within the sealed
unit). It's a relatively big window, but it's only on the one wall;
the family room, by comparison, is warmer despite bigger windows on
both walls. I will try the plastic, mind you, and see if that helps.
I hadn't heard of the "plastic bag" test, and will try that. I
suspect that I'm simply not getting enough airflow into those ducts,
and if I can correct that problem, that will be a significant
The house is a 2200 s.f. bungalow, so I'm heating 2200 square feet
upstairs, (including the 200 s.f. addition), and 2000 feet in the
basement. My gas bill in the winter is roughly $175 per month. The
addition is very poorly insulated (it's one of those sunroom things,
and the ceiling is half windows), and even though it's got a beautiful
cedar interior with awesome curved laminated cedar beams, I'll likely
remove the room next year and convert the space to a deck. I've been
hoping to come up with a lake lot or rental property that could
benefit from the extra room and relocate it, likely as a non-heated
sunroom, but haven't found a place for this addition yet.
I'm undertaking renovations, and windows are on the agenda in the next
couple of years, but I truly think that my problem is more heat
related than heat-loss related. The windows don't frost at all,
they're not particularly cold to the touch, and I don't get a draft at
all. I know that's not a perfect test, but it's what I have done so
I think I'll try removing some of the insulation under that portion of
the house and see if that helps. Also use the tests recommended to
check for actual air flow through those ducts.
Anybody know how effective those "in-duct" fans are? And are they
relatively simple to wire to the furnace? Do they cause any other