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

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

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

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

Guide describing removal of construction debris from flex ducts and protection of ducts and HVAC equipment during construction to keep them free of dust and debris.

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

Guide describing the split system heat pumps used for central forced air heating and cooling.

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

Guide describing ductless heat pump systems used for single-room or whole-house heating and cooling.

Guide describing ground-source (geothermal) heat pumps including an overview of technology and guidance on compliance and installation.

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

Guide describing sizing methods for cold climate heat pumps.