Chad Clark's Open Journal : 2008-02-09

1) Canadian grant if you upgrade a furnace, water heater, etc.

As of January 1, 2008 there is a grant available for people who replace
insulation, furnance, toilet, or water heater with a more efficient one.

http://oee.nrcan.gc.ca/residential/personal/retrofit-homes/retrofit-qualify-grant.cfm

$500 for installing "an ENERGY STAR qualified gas furnace that has a
     92.0% AFUE or better, and a DC variable-speed motor"

$300 for installing "an ENERGY STAR qualified gas furnace that has a
     90.0% annual fuel utilization efficiency (AFUE) or better"

$250 for replacing "your domestic hot water heater with an instantaneous
     gas water heater that has an energy factor (EF) of 0.80 or a thermal
     efficiency of 90 percent or better."

$300 for replacing "your domestic hot water heater with a condensing water
     heater that has an EF of 0.80 or better."

$50 for replacing "your toilet with a low-flush or dual-flush toilet rated
     at 6 litres per flush or less that meets the Los Angeles Supplementary
     Purchase Specification (SPS) and with a flush performance of 350 grams
     or more."

There is also money available if you add extra insulation to various parts
of the dwelling.  (attic, basement, exterior walls, etc).

Note: "In replacing any of the equipment listed in this brochure, the new
equipment must have a higher efficiency than that of the original"