Here are some useful links for Home Energy Audits and Rebates, for Insulation, Replacement Windows, Furnaces, and Solar Power, available from the following utilities when you hire an approved contractor in:

Platte river Power Authority, serving Fort Collins, Loveland, Longmont, Estes Park: http://efficiencyworks.prpa.org/

Fort Collins:
http://www.fcgov.com/utilities/residential/conserve/home-efficiency-program/

Loveland:
http://www.cityofloveland.org/index.aspx?page=1598

Xcel Energy:
http://responsiblebynature.com/?noredirect=1

PVREA:
http://www.pvrea.com/rebates

Laramie, Wyoming:
https://www.rockymountainpower.net/res/sem/wyoming.html

Cheyenne, Wyoming:
https://www.cheyennelight.com/save-money-energy