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Guide that illustrates how and when to encapsulate ductwork in unconditioned attics, increasing the R-value of duct insulation, mitigating condensation issues, and reducing air leakage.

Guide describing air-sealing of the seams and holes in HVAC air handler and furnace cabinets.

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 combustion furnaces with selection and installation guidance.

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

Guide describing the installation of boiler controls in multifamily housing.

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.