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This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.

No outdoor air intakes connected to return side of the HVAC system, unless controls are installed to operate intermittently & automatically based on a timer and to restrict intake when not in use (e.g., motorized damper)

Guide describing proper installation of high-MERV furnace and air-handler filters.

Guide describing how to install jump ducts in bedroom walls to balance air pressures between rooms, enabling constant air flow for conditioning and freshness even when room doors are closed.

Guide describing how to air seal and insulate flex ducts.

Guide describing how to install ducted returns in bedroom walls to balance air pressures between rooms and to enable stale air to return to a central heating system's air handler for reconditioning even when room doors are closed.

Guide describing design and installation of compact duct systems for central heating and cooling systems.

Guide describing how to design HVAC systems to be located within the conditioned space of the home, either in a utility closet or in an air sealed conditioned attic, basement, or crawl space.

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

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

Guide outlining how to correctly install flex ducts without excessive coils or loops.

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

Guide describing the uses, selection process, and specification of high-MERV filters.

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

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