Guides A-Z

Guide describing combustion furnaces with compliance and installation guidance.

Guide describing condensing boilers and hot water heat distribution systems used for home heating.

Guide describing how to install a corrosion-resistant drain pan in condensate-producing HVAC equipment.

Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Guide describing how to upgrade or expand an existing HVAC system.

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.

Guide describing additional requirements for HVAC systems in warm-humid climates to operate in a dehumidification mode to maintain indoor relative humidity at or below 60 percent.