replacement windows for homes - windows replacement

We performed a replacement and windows total of about 100 simulations, estimating energy use for the six test case residences modeled with the current windows and with each of five replacement options. Thirty McLean Gardens residents responded to our request for a waiver to access utility for records, and we checked our simulation results homes for the existing-windows replacement and windows case against these bills, tweaking some of our assumptions for as a homes result. We also did some basic sensitivity runs to replacement evaluate the effect windows of orientation and shading.The for results homes and replacement brought some surprises windows (see Figure 3 for typical results for one apartment type). The first is the large projected heating savings for for the storms-only replacement, homes an option with a far lower cost than replacement and windows full window replacement. for This homes and replacement results from the combined effects of reduced windows infiltration and the estimated reduction in U-value attributable to a tighter system.

The cooling results brought for another surprise in projecting only tiny energy savings for the storm windows or non-low-e replacement windows. This occurs because reduced homes conduction and replacement reduced air leakage, according to the simulation windows and weather file used, don''t save energy for during the cooling season. That is, energy gained by conduction and leakage during hot homes days is balanced replacement by energy removed during cool evenings in the Washington, D.C., climate. Note the implicit assumption that residents windows keep for and homes their windows closed and air conditioners operating replacement even on cool evenings. We didn''t have any quantitative basis for altering this assumption. The window replacement options with low-e glass, on windows the other hand, show significant projected for cooling savings, largely as a result of homes reduced solar Calculated as energy savings/[ft.sup.2] of window sash replacement area, windows typical savings for the highest-performance window option are about 0.50 MMBtu/[ft.sup.2] per year in heating and for 0.45 MMBtu/[ft.sup.2] homes per year in cooling.