Heating and Cooling

How do I insulate my entire home?
Do-It-Yourself Guide to Energy Star Home Sealing (.pdf)

How do I insulate my walls or the attic?
US Department of Energy Consumer's Guide - wall insulation

How do I seal attic bypasses?
The Family Handyman - seal attic air leaks

How do I caulk and weather-strip windows and doors?
Energy Efficient Advisor - caulking and weather stripping

How do I change single pane windows to Energy Star?
EnergyStar.gov - windows, doors and skylights

What is the basic maintenance of heating and air conditioning systems?
EnergyStar.gov - heating and cooling
PowerHouse - saving energy: heating and cooling

How do I replace my central air conditioner with an energy efficient unity (SEER rating of 14 or higher)? 
HomeTips.com - central AC energy efficiency
EnergyGuide.com - central AC energy efficiency

How do I replace my old furnace with an energy efficient model with a variable speed blower?                       
ACEEE - information on replacing furnaces and boilers

How do I get rebates?
SCE residential rebates for heating and cooling
So Cal Gas residential rebates program               
SimplyInsulate.com - federal tax incentives FAQs