Guide describing how to conduct testing for adequate combustion air in the space where a combustion appliance is located if the appliance is located within the conditioned space of the home.

Guide describing combustion furnaces with selection and installation guidance.

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

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

Guide describing the use of electronically commutated motors (ECMs) in HVAC central air handler fans to reduce power consumption compared to a single-stage fan motor.

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 fuel tank anchoring practices for disaster resistance.

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

Guide describing design and installation considerations for combined space and water heating systems using a tankless on-demand water heater, a hydronic heating coil and air handler, and optional cooling coil.

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

Guide describing strategies for purging air in existing steam heating systems in multifamily buildings.

Guide describing how to improve boiler efficiency in multifamily central hydronic heating systems by installing thermostatically controlled radiator valves (TRV) to reduce temperatures in overheated spaces.

Guide describing concerns with un-vented combustion appliances such as sealed fireplaces.