BASC Search | Building America Solution Center

Right - All seams in the HVAC equipment and ductwork are sealed with mastic; because the HVAC equipment is in the garage, it is an air-sealed closet.

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Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

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An exhaust fan pulls damp air out of a retrofitted sealed crawlspace while drawing in dry air from the living space

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A direct-vent sealed-combustion fireplace takes its combustion air directly from outside through a dedicated air inlet and vents combustion products directly outside

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Right – A simple stacked rectangular design and well-insulated and air-sealed ICF walls provide for an extremely energy-efficient structure.

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Wrong – Where possible, design walls and specify window sizes and placement to minimize the use of studs around windows; and seal all wood-to-wood seams to minimize air leakage through walls.

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A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used

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No Ducts or Air Handlers Located in Garage

Guide

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 attic, basement, or crawl space.

Retrofit Improvements - Improve Window & Door Flashing/Sealing

Reference

Fact sheet describing methods for flashing and air-sealing windows and doors.

Building Science Introduction - Air Flow

Information Guide

Information guide describing the concept of air flow in residential buildings and its effects on occupants, building durability, and efficiency.

Technology Solutions Case Study: Ventilation System Effectiveness and Tested Indoor Air Quality Impacts

Case Study

Case study describing the effectiveness of various ventilation systems at two unoccupied, single-family lab homes at the University of Texas at Tyler.

Home Performance Assessment

Information Guide

Information guide describing how to apply a whole-house approach to home improvement with energy efficiency upgrades, improved indoor air quality, and increased comfort.