15 practical answers
Home energy FAQ
Start with the question in front of you. Each answer gives the short version first, then the measurements, safety checks, or source documents you need to make a sound decision.
Indoor air and HVAC
Air duct cleaning
Know when duct cleaning is justified, what a credential proves, and which indoor-air claims deserve a closer look.
Browse categoryMaterials and safety
Attic insulation
Compare common attic materials, choose an assembly that fits the house, and recognize insulation that should be left alone.
Browse categoryDepth, bags, and R-value
Blown-in insulation
Turn attic measurements and product coverage charts into a defensible material estimate without guessing from depth alone.
Browse categoryMoisture and durability
Crawl space encapsulation
Understand the full moisture-control system, the materials it uses, and the honest limits of resale-value claims.
Browse categoryHome battery specifications
Tesla Powerwall 3
Check the dimensions, generation-to-generation differences, and battery facts Tesla publishes before comparing installation quotes.
Browse categoryNeed the full project breakdown?
The guide library covers costs, quote checks, and planning steps in more depth.