I would listen to TOPPS. Just look at the industry authority on the matter ACCA Manual J Residential Load Calculation page 9 section 1-4 Building Losses. Here is what it says (an HVAC Top 3 list if you will):
A. Heat loss through glass windows and doors by conduction.
B. Heat loss through solid doors by conduction.
C. Heat loss through walls exposed to outdoor temperatures or through walls below grade.
Heat transfer multipliers are an indication of how much heat (in BTUS/hr per every square foot of material) is passed from inside a warmer home to a colder outdoor temp. Assuming a 70F indoor temperature and a modest 40F outdoor temp (mild indeed) here are some numbers for a single pane window without and with a simple storm window - not a big cost investment.
Realize that CT has a design outdoor Winter temperature of 7-9F (a 63-61F temperature difference @ a 70F Indoor temp)
ACCA Manual J Residential Load Calculation
TABLE 2 page 65
Single pane wood frame clear glass =
29.7 btuh/sq ft @ 30F TD (64.4 btu/sq ft @ 65F TD)
Single pane wood frame clear glass and storm =
14.3 btuh/sq ft @ 30F TD (30.9 btuh/sq ft @ 65F TD)
I only went to Government schools; however, you have at least a 50% reduction in heat loss through the windows alone with just well installed storm windows. That is for EVERY SQUARE FOOT OF EVERY WINDOW in your house.
As to the waste of insulating walls, lets cruise over a few pages - same book, same table.
TABLE 2 page 68
Wood frame exterior wall no insulation and 1/2" Gypsum Brd =
8.1 btuh/sq ft @ 30F TD (17.6 btuh/sq ft @ 65F TD)
Wood frame exterior as above with R-11 in cavity 1/2" Gyp Brd=
2.7 btuh/sq ft @ 30F TD (5.8 btuh/ sq ft @ 65F TD)
Remember I went to Government school so you all do the math.
Just a thought.
Rock on TOPPS!!
Last edited on Sun Oct 19th, 2008 11:08 pm by dkpd1581
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