I took a cool course where they discussed energy in buildings.
Here is the pdf of the slides.
It contains lots of cool info:
How to calculate your house energy usage
Types of heat transfer
Stack Effect in your house
Wind Effect
Building Envelope
R and U value
Water usage
Electric Mixing valves
Lighting
Motors
Appliances
Conservation Strategies
Heating Systems
Firing Rates for Boilers
Testing for combustion efficiency
Ventilation
Heating Controls
Asthma
Mold
Moisture
Chemical Safety
Green Cleaning Products
VOC
Green Pest Management
Carbon Monoxide
Asbestos
Lead
Radon