Existing HVAC System Upgrade or Expansion Description Guide describing how to upgrade or expand an existing HVAC system.
Home Performance Assessment Description Information guide describing how to apply a whole-house approach to home improvement with energy efficiency upgrades, improved indoor air quality, and increased comfort.
Combustion Furnaces Description Guide describing combustion furnaces with selection and installation guidance.
Pre-Retrofit Assessment of Combustion Appliances Description Information guide describing things to consider before attempting retrofits including any combustion appliances, or that may affect them.
Fireplaces and Wood Stoves Have Proper Ventilation Description Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.
Condensing Boilers Description Guide describing condensing boilers and hot water heat distribution systems used for home heating.
Gas-Fired Boilers Description Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.
Direct Vent Equipment Description Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.