Existing HVAC System Upgrade or Expansion Description Guide describing how to upgrade or expand an existing HVAC system.
Ground-Source Heat Pumps Description Guide describing ground-source (geothermal) heat pumps including an overview of technology and guidance on compliance and installation.
Pre-Retrofit Assessment of Existing HVAC Systems Description Information guide describing considerations for before retrofitting HVAC systems, retrofit scope considerations, and HVAC system replacement options.