Many utilities offer incentives to homeowners who make improvements that save energy. Contact your utility company to determine if you're eligible for a low-interest loan or discount for replacing your windows and doors. Ask about energy-efficient insulating features such as argon gas between the panes of glass and a Low-E coating.
When cutting up small pieces for a project, an easier way to doublecheck for accuracy is to measure a number of the pieces at once. If you have four pieces which should be exactly 8 in. long, lay them end to end and measure. This multiplies small errors hard to detect on only one piece. For example, if the four pieces measure 32-1/8 in. instead of 32, then you know that each of the pieces is 1/32 in. too long.