Van Cortlandt Green is a newly constructed 62,000-square foot affordable 86-studio rental building for seniors. The building is LEED Silver rated with 15% better energy and fuel consumption than regulated by the energy code. The building is operated by SelfHelp Community Services: one of the largest and most respected not-for-profit human service agencies in the New York metropolitan area providing a broad set of services to more than 20,000 elderly, frail, and vulnerable New Yorkers each year. Altera Engineering were retained to carry out design and construction services for adult day care facility in the ground and second floor. Home / Multifamily VAN CORTLANDT GREEN ADULT CARE FACILITY ARCHITECT . Dattner Architects (base building) | Fulcrum Proper PROJECT SIZE . 4,000 SF PROJECT COST . SCOPE . HVAC, sprinkler, plumbing and electrical power, fire alarm design Go Go Van Cortlandt Green is a newly constructed 62,000-square foot affordable 86-studio rental building for seniors. The building is LEED Silver rated with 15% better energy and fuel consumption than regulated by the energy code. The building is operated by SelfHelp Community Services: one of the largest and most respected not-for-profit human service agencies in the New York metropolitan area providing a broad set of services to more than 20,000 elderly, frail, and vulnerable New Yorkers each year. Altera Engineering were retained to carry out design and construction services for adult day care facility in the ground and second floor.

A new 31-unit luxury condominium building in Harlem. The building does not use natural gas or any other fuel for heating. The building is cooled and heated with a variable-refrigerant flow system in lieu of more conventional gas-fired boilers. Home / Multifamily 18 WEST 116TH STREET, NYC ARCHITECT . GF55 PROJECT SIZE . 50,000 GSF PROJECT COST . $14.5 million SCOPE . Full MEP design, and construction administration services, energy modeling and sustainability consulting services. HVAC, sprinkler, plumbing and electrical power design and construction administration, sustainability, façade optimization, energy modeling. Go Go A new 31-unit luxury condominium building in Harlem. The building does not use natural gas or any other fuel for heating. The building is cooled and heated with a variable-refrigerant flow system in lieu of more conventional gas-fired boilers.

NYC Department of Housing Preservation & Development has announced the selection of the Norma, an 11-story, 100% affordable home ownership project designed by Leong Leong with Almat Urban and Bedford Stuyvesant Restoration Corporation. The Norma (named in honor of Norma Merrick Sklarek, the first African American woman to pass her license exam to officially become an architect in both New York and California) will give rise to 44 homeownership opportunities through a mix of 1- to 3-bedroom condo-style coops for low- to moderate-income households with a broad range of affordability. Under the plans, the Brownsville Multi Service Wellness and Health Center will operate a new urgent care facility on the ground floor, providing services for adult medicine, pediatrics, physical therapy, OB/GYN, mental health and dentistry among others. A community terrace on the second floor will create space for community building, resident organizing and activities. Additionally, the building is designed to comply with Passive House energy efficiency and sustainability standards with a fully electric mechanical heating and cooling systems. Green Roof, Stormwater Retention, and Mechanical Systems In order to reduce load on the CSO, gardens and green spaces adjacent to the Northern facade can use storm-water in a retention and irrigation effort. A 1,067 sf green roof above the eleventh floor penthouse will absorb heavy rains and provide an extra layer of insulation, which will increase the energy efficiency and lower carbon footprints. The pavement in the rear yard of the site will be permeable so that aquifers can be recharged. Proposed planters on the second floor and eleventh floor amenity spaces with small trees and foliage will provide shade and a nice visual touch, as well as storm-water retention in its own right. The team proposes the use of a high-performance, high-efficiency HVAC system. Initial research centers on the feasibility of a variable refrigerant flow unit (VRF) mini-split with a heat recovery ventilator (HRV) unit, to provide (at least part of) the mechanical heating and cooling for the building. Home / Multifamily THE NORMA on FULTON STREET ARCHITECT . Leong Leong PROJECT SIZE . 80,000 SF SCOPE . HVAC, sprinkler, plumbing and electrical power, fire alarm design and construction administration Go Go NYC Department of Housing Preservation & Development has announced the selection of the Norma, an 11-story, 100% affordable home ownership project designed by Leong Leong with Almat Urban and Bedford Stuyvesant Restoration Corporation. The Norma (named in honor of Norma Merrick Sklarek, the first African American woman to pass her license exam to officially become an architect in both New York and California) will give rise to 44 homeownership opportunities through a mix of 1- to 3-bedroom condo-style coops for low- to moderate-income households with a broad range of affordability. Under the plans, the Brownsville Multi Service Wellness and Health Center will operate a new urgent care facility on the ground floor, providing services for adult medicine, pediatrics, physical therapy, OB/GYN, mental health and dentistry among others. A community terrace on the second floor will create space for community building, resident organizing and activities. Additionally, the building is designed to comply with Passive House energy efficiency and sustainability standards with a fully electric mechanical heating and cooling systems. Green Roof, Stormwater Retention, and Mechanical Systems In order to reduce load on the CSO, gardens and green spaces adjacent to the Northern facade can use storm-water in a retention and irrigation effort. A 1,067 sf green roof above the eleventh floor penthouse will absorb heavy rains and provide an extra layer of insulation, which will increase the energy efficiency and lower carbon footprints. The pavement in the rear yard of the site will be permeable so that aquifers can be recharged. Proposed planters on the second floor and eleventh floor amenity spaces with small trees and foliage will provide shade and a nice visual touch, as well as storm-water retention in its own right. The team proposes the use of a high-performance, high-efficiency HVAC system. Initial research centers on the feasibility of a variable refrigerant flow unit (VRF) mini-split with a heat recovery ventilator (HRV) unit, to provide (at least part of) the mechanical heating and cooling for the building.

A new 5-storey luxury rental building in Bushwick neighborhood of Brooklyn. The project comprises of studios, 1 and 2-bedroom apartments. The building does not use natural gas or any other fuel for heating. The building is cooled and heated with a variable-refrigerant flow system in lieu of more conventional gas-fired boilers. Hot water for domestic use is generated via refrigerant-based heat pump water heaters. Home / Multifamily 1062 HANCOCK STREET, BROOKLYN ARCHITECTURE . Think! Architecture PROJECT SIZE . 13,000 SF PROJECT COST . SCOPE . full MEP design, HVAC, sprinkler, plumbing and electrical power design and construction administration Go Go A new 5-storey luxury rental building in Bushwick neighborhood of Brooklyn. The project comprises of studios, 1 and 2-bedroom apartments. The building does not use natural gas or any other fuel for heating. The building is cooled and heated with a variable-refrigerant flow system in lieu of more conventional gas-fired boilers. Hot water for domestic use is generated via refrigerant-based heat pump water heaters.

In early 2026 (January), new building permits were filed for a 14-story building with approximately 483 residential units, about 242,000+ sq ft of residential space, plus ~21,000 sq ft of commercial space (total height around 150 feet). Currently, it remains the existing low-rise commercial structure, but construction on the new mixed-use affordable housing tower appears to be advancing or permitted. Proposed Development • 333 units of 100% affordable housing, proposing HDC/HPD Mix and Match Program. • Return of existing Fine Fare Supermarket • 6,750 SF of community facility • Enhanced Community Experience with active ground floor supermarket, street level retail and landscaped entryway • 117 Parking Spaces • Sustainable Design • Solar Powered and/or Green Roof Home / Multifamily 2560 BOSTON ROAD ARCHITECTS . Aufgang Architects PROJECT SIZE . 263,000 SF SCOPE . Full MEP design, and construction administration services, energy modeling and sustainability consulting services, commissioning. HVAC, sprinkler, plumbing and electrical power, fire alarm design and construction administration, sustainability, façade optimization, energy modeling Go Go In early 2026 (January), new building permits were filed for a 14-story building with approximately 483 residential units, about 242,000+ sq ft of residential space, plus ~21,000 sq ft of commercial space (total height around 150 feet). Currently, it remains the existing low-rise commercial structure, but construction on the new mixed-use affordable housing tower appears to be advancing or permitted. Proposed Development • 333 units of 100% affordable housing, proposing HDC/HPD Mix and Match Program. • Return of existing Fine Fare Supermarket • 6,750 SF of community facility • Enhanced Community Experience with active ground floor supermarket, street level retail and landscaped entryway • 117 Parking Spaces • Sustainable Design • Solar Powered and/or Green Roof

915 West End Avenue is a 120,000 SF 15-story multifamily building commissioned by a prolific upper west side builder Joseph Paterno (whose initials were inscribed above the entrance), designed by Rosario Candela and completed in 1922 at a cost of approximately $625,000. The building was designed in Renaissance Revival style, and is laid out as two wings around a central core with outer court. Boiler room, laundry facility, oil tank, and incoming services are located in the basement. Lobby and 94 apartments are located on floors 1 through 15. In 2015 the building was included into Riverside-West End Historic District Extension II, and is subject to certain Landmarks restrictions. Following the $ 85.5 million acquisition by a group of investors, Altera Engineering was retained to evaluate the existing heating, plumbing, gas and power distribution systems. Our engineers worked closely with the owner’s architects and marketing team to identify and carry out short payback upgrades to support the investors’ conversion and repositioning program to the ‘best-in-class’ multifamily rental. 915 West End Avenue is one of several Altera Engineering projects along the historic West End Avenue 347 West End and 309 West 86th Street. Home / Multifamily 915 WEST END AVENUE ARCHITECT . PROJECT SIZE . PROJECT COST . SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go 915 West End Avenue is a 120,000 SF 15-story multifamily building commissioned by a prolific upper west side builder Joseph Paterno (whose initials were inscribed above the entrance), designed by Rosario Candela and completed in 1922 at a cost of approximately $625,000. The building was designed in Renaissance Revival style, and is laid out as two wings around a central core with outer court. Boiler room, laundry facility, oil tank, and incoming services are located in the basement. Lobby and 94 apartments are located on floors 1 through 15. In 2015 the building was included into Riverside-West End Historic District Extension II, and is subject to certain Landmarks restrictions. Following the $ 85.5 million acquisition by a group of investors, Altera Engineering was retained to evaluate the existing heating, plumbing, gas and power distribution systems. Our engineers worked closely with the owner’s architects and marketing team to identify and carry out short payback upgrades to support the investors’ conversion and repositioning program to the ‘best-in-class’ multifamily rental. 915 West End Avenue is one of several Altera Engineering projects along the historic West End Avenue 347 West End and 309 West 86th Street.

Altera Engineering Cultural Projects Our Projects Cultural PARRISH ART MUSEUM PS 122 COMMUNITY ARTS CENTER UNITED NATIONS PERMANENT MEMORIAL YWCA OF BROOKLYN MARINER'S HARBOR COMMUNITY CENTER ROCKY MOUNTAIN BAPTIST CHURCH CRYSTAL BRIDGES MUSEUM OF AMERICAN ART STEWART HOTEL

This project, for New York City’s Department of Cultural Affairs, transformed a five-story historic former public school to better house four arts groups and one community-service organization. Built in 1894, PS 122 was originally a public school (hence the name). Since the 1970’s the building has been inhabited by a non-profit collaborative, daycare center and an AIDS drop in center. The primary objective of this project was to bring the building up to code and upgrade the mechanical and fire protection systems. Additionally the building needed significant reorganization and alterations to its interior spaces. The design scope included addition at the roof, to connect the means of egress at the fifth floor. The project was required to meet LL86 requirements. Mechanical systems included: A packaged air-cooled modular chiller plant designed with an 18-degree temperature difference to reduce pumping and piping Variable primary pumping A dedicated outdoor air system (DOAS) with energy recovery and demand-based ventilation controls Sensible-only 4-pipe fan coils Home / Cultural PS 122 COMMUNITY ARTS CENTER ARCHITECT . Deborah Berke Partners PROJECT SIZE . 50,000 GSF PROJECT COST . $ 32 million SCOPE . HVAC design Go Go This project, for New York City’s Department of Cultural Affairs, transformed a five-story historic former public school to better house four arts groups and one community-service organization. Built in 1894, PS 122 was originally a public school (hence the name). Since the 1970’s the building has been inhabited by a non-profit collaborative, daycare center and an AIDS drop in center. The primary objective of this project was to bring the building up to code and upgrade the mechanical and fire protection systems. Additionally the building needed significant reorganization and alterations to its interior spaces. The design scope included addition at the roof, to connect the means of egress at the fifth floor. The project was required to meet LL86 requirements. Mechanical systems included: A packaged air-cooled modular chiller plant designed with an 18-degree temperature difference to reduce pumping and piping Variable primary pumping A dedicated outdoor air system (DOAS) with energy recovery and demand-based ventilation controls Sensible-only 4-pipe fan coils

The current church building is part of a modern mixed-use development that combines a new worship sanctuary with affordable housing to address community needs in the area. Key details include: Construction Timeline: Building began in late summer 2021. As of the church's latest updates (into 2025), the project was nearing completion, with excitement around moving into the new facility. Sunday services are now held in the new space starting at 11:00 AM. Design and Purpose: The development includes a dedicated sanctuary for worship and five stories of low-income housing above it. This was envisioned as a collaborative effort to benefit both the church and the broader neighborhood along Hillside Avenue, helping to provide much-needed affordable units in a high-demand area. City Councilman Ydanis Rodríguez (representing Washington Heights, Inwood, and Marble Hill) highlighted the project's role in adding housing stock during groundbreaking events. Architectural Firm: The project was designed by AiF (likely Anderson Inouye + Fredericks), a firm specializing in community-focused architecture. They were commissioned to create a new worship facility tailored to the longstanding Baptist congregation in Inwood. Prior Location: Before the new build, the church operated from the same Hillside Avenue address (noted as 37-41 Hillside Ave in older records), suggesting the development may involve renovation or expansion of the existing site rather than a full relocation. The building emphasizes functionality for worship and community support, though specific architectural features (e.g., facade materials or capacity) are not detailed in public sources beyond its multi-story residential integration. Home / Cultural ROCKY MOUNTAIN BAPTIST CHURCH ARCHITECT . ARCHITECTURE IN FORMATION PROJECT SIZE . PROJECT COST . SCOPE . Design, approvals and construction administration of mechanical, plumbing, sprinkler, electrical and fire alarm systems. Go Go The current church building is part of a modern mixed-use development that combines a new worship sanctuary with affordable housing to address community needs in the area. Key details include: Construction Timeline: Building began in late summer 2021. As of the church's latest updates (into 2025), the project was nearing completion, with excitement around moving into the new facility. Sunday services are now held in the new space starting at 11:00 AM. Design and Purpose: The development includes a dedicated sanctuary for worship and five stories of low-income housing above it. This was envisioned as a collaborative effort to benefit both the church and the broader neighborhood along Hillside Avenue, helping to provide much-needed affordable units in a high-demand area. City Councilman Ydanis Rodríguez (representing Washington Heights, Inwood, and Marble Hill) highlighted the project's role in adding housing stock during groundbreaking events. Architectural Firm: The project was designed by AiF (likely Anderson Inouye + Fredericks), a firm specializing in community-focused architecture. They were commissioned to create a new worship facility tailored to the longstanding Baptist congregation in Inwood. Prior Location: Before the new build, the church operated from the same Hillside Avenue address (noted as 37-41 Hillside Ave in older records), suggesting the development may involve renovation or expansion of the existing site rather than a full relocation. The building emphasizes functionality for worship and community support, though specific architectural features (e.g., facade materials or capacity) are not detailed in public sources beyond its multi-story residential integration.

Located in the Mariner’s Harbor neighborhood, the currently unoccupied 2,715 SF community space is situated on the ground floor of Building Number 5 within the New York City Housing Authority’s Marnier’s Harbor Houses public housing complex, the westernmost public housing development in New York City. Built in 1954, the complex consists of 22 three- and six-story buildings containing 607 apartments housing 1,658 residents across a 21.75-acre site. The project included a complete renovation of the existing space including all finishes, fixtures, HVAC, fire alarm, plumbing, and lighting, and provided flexible, multi-purpose programming. Support spaces included accessible restrooms, a janitor’s closet, and an IT/server closet. Exterior work included replacement of the existing canopy, new doors with actuator and door bell, and new lighting. The program also included community gathering spaces with audio/visual capabilities, a computer lab, and a commercial kitchen. Mechanical systems included: • An all new high efficient all-electric multi-zone VRF system • Distributed ERV’s throughout the space • All new electrical distribution • All new domestic and sanitary plumbing Home / Cultural MARINER'S HARBOR COMMUNITY CENTER ARCHITECT . Architecture In Formation PROJECT SIZE . 2,700 SF PROJECT COST . $6.1 MILLION SCOPE . MEP design Go Go Located in the Mariner’s Harbor neighborhood, the currently unoccupied 2,715 SF community space is situated on the ground floor of Building Number 5 within the New York City Housing Authority’s Marnier’s Harbor Houses public housing complex, the westernmost public housing development in New York City. Built in 1954, the complex consists of 22 three- and six-story buildings containing 607 apartments housing 1,658 residents across a 21.75-acre site. The project included a complete renovation of the existing space including all finishes, fixtures, HVAC, fire alarm, plumbing, and lighting, and provided flexible, multi-purpose programming. Support spaces included accessible restrooms, a janitor’s closet, and an IT/server closet. Exterior work included replacement of the existing canopy, new doors with actuator and door bell, and new lighting. The program also included community gathering spaces with audio/visual capabilities, a computer lab, and a commercial kitchen. Mechanical systems included: • An all new high efficient all-electric multi-zone VRF system • Distributed ERV’s throughout the space • All new electrical distribution • All new domestic and sanitary plumbing

The Young Women’s Christian Association was founded in 1888. The goal of the organization was to provide a meeting place for young women who were employed in retail stores, as office workers and other occupations throughout Brooklyn. These young ladies could listen to lectures, concerts, enjoy the reading room, and receive Christian instruction, if so desired. It was the first major organization of its kind in Brooklyn to be entirely run by women. In 1928 the Y has moved to its current building at 30 Third Avenue. The 11-story building was designed by Frederick Lee Ackerman and Alexander B. Trowbridge. The building has always served as a multi-use facility, including 214 units of supportive, low-income housing for women, a theater, a pool, health and community services, etc. This was the first YWCA to integrate its residences and programs racially. Altera Engineering were tasked with minor HVAC upgrades as well as a feasibility analysis for a co-generation module. Home / Cultural YWCA OF BROOKLYN ARCHITECT PROJECT SIZE . 180,000 SF PROJECT COST SCOPE . HVAC design, energy efficiency, CHP feasibility Go Go The Young Women’s Christian Association was founded in 1888. The goal of the organization was to provide a meeting place for young women who were employed in retail stores, as office workers and other occupations throughout Brooklyn. These young ladies could listen to lectures, concerts, enjoy the reading room, and receive Christian instruction, if so desired. It was the first major organization of its kind in Brooklyn to be entirely run by women. In 1928 the Y has moved to its current building at 30 Third Avenue. The 11-story building was designed by Frederick Lee Ackerman and Alexander B. Trowbridge. The building has always served as a multi-use facility, including 214 units of supportive, low-income housing for women, a theater, a pool, health and community services, etc. This was the first YWCA to integrate its residences and programs racially. Altera Engineering were tasked with minor HVAC upgrades as well as a feasibility analysis for a co-generation module.

“Inspired by the natural setting and artistic life of Long Island’s East End, the Parrish Art Museum illuminates the creative process and how art and artists transform our experiences and understanding of the world and how we live in it. The Museum fosters connections among individuals, art, and artists through care and interpretation of the collection, the presentation of exhibitions, publications, educational initiatives, programs, and artists-in-residence” Born in 1897 as the Art Museum at Southampton, it was established by a New York lawyer, Samuel Longstreth Parrish, to house his holdings of Italian Renaissance paintings and 19th-century plaster casts; both the building and the collection were given to the Village of Southampton after his death. In the 1950s a local philanthropist, Rebecca Bolling Littlejohn, chartered the museum as an independent entity, named it for Mr. Parrish, and endowed it with her own collection of American painting, rich in work by Impressionists like Chase and Childe Hassam, as well as local artists of the era, like Fairfield Porter and Larry Rivers. Once home to Jackson Pollock, Willem de Kooning and Roy Lichtenstein, among many others, the area has been an artists’ colony since the 19th century. Today’s residents, full time or seasonal, include Chuck Close, April Gornik, Eric Fischl, Ilya and Emilia Kabakov, and Donald Sultan, as well as many more lesser-known names. In 2005 the Museum purchased fourteen acres in Water Mill, New York, and the Board of Trustees selected the internationally celebrated architectural firm Herzog de Meuron to design a new and expanded building there. Ground was broken in July 2010, and the 34,400 square-foot building opened to the public November 10, 2012. Drawing inspiration from local barn houses, Herzog de Meuron envisioned a single-story structure — 94 feet wide and 634 feet long — with the building’s galleries arranged in two rows along a central corridor, designed for flexibility, with temporary walls so that the size of the rooms can be adjusted. The building is covered by two parallel pitched roofs — one for each row — with north-facing windows that take full advantage of the soft northern light. The building doubled the size of the existing facility with 12,000 square feet of flexible galleries, including the first galleries dedicated to permanent collection. The museum includes educational and multi-purpose spaces, café and kitchen. The design incorporates administrative offices and onsite space for storage and care of the permanent collection. To support the architect’s vision for a clean minimalist building, all mechanical equipment was tucked away in the cellar and crawl spaces. As part of design team at Buro Happold’s New York office, Mr. Morozov conceived a geothermal heating and cooling plant that took advantage of high water table below the site. Geothermal water was pumped from 6 standing column wells, circulated through reversible heat pump chillers and dumped into 6 discharge wells downstream. The reversible chillers use ground source water to generate 45-degree water in the summer and 85-degree water in the winter. For even better energy efficiency the heat pump chillers were paired with displacement ventilation. Unlike overhead air supply, displacement ventilation air cools or heats the space with moderately cool or warm air. Custom air-handlers also were located in the cellar spaces. Air distribution was limited to building’s perimeter with supply ducts running in the oversized crawl space. Home / Cultural PARRISH ART MUSEUM ARCHITECT . Herzog De Meuron, Douglas Moyer PROJECT SIZE . 34,000 SF PROJECT COST . $ 30 million SCOPE . Full HVAC design (as design engineer at Buro Happold) Go Go “Inspired by the natural setting and artistic life of Long Island’s East End, the Parrish Art Museum illuminates the creative process and how art and artists transform our experiences and understanding of the world and how we live in it. The Museum fosters connections among individuals, art, and artists through care and interpretation of the collection, the presentation of exhibitions, publications, educational initiatives, programs, and artists-in-residence” Born in 1897 as the Art Museum at Southampton, it was established by a New York lawyer, Samuel Longstreth Parrish, to house his holdings of Italian Renaissance paintings and 19th-century plaster casts; both the building and the collection were given to the Village of Southampton after his death. In the 1950s a local philanthropist, Rebecca Bolling Littlejohn, chartered the museum as an independent entity, named it for Mr. Parrish, and endowed it with her own collection of American painting, rich in work by Impressionists like Chase and Childe Hassam, as well as local artists of the era, like Fairfield Porter and Larry Rivers. Once home to Jackson Pollock, Willem de Kooning and Roy Lichtenstein, among many others, the area has been an artists’ colony since the 19th century. Today’s residents, full time or seasonal, include Chuck Close, April Gornik, Eric Fischl, Ilya and Emilia Kabakov, and Donald Sultan, as well as many more lesser-known names. In 2005 the Museum purchased fourteen acres in Water Mill, New York, and the Board of Trustees selected the internationally celebrated architectural firm Herzog de Meuron to design a new and expanded building there. Ground was broken in July 2010, and the 34,400 square-foot building opened to the public November 10, 2012. Drawing inspiration from local barn houses, Herzog de Meuron envisioned a single-story structure — 94 feet wide and 634 feet long — with the building’s galleries arranged in two rows along a central corridor, designed for flexibility, with temporary walls so that the size of the rooms can be adjusted. The building is covered by two parallel pitched roofs — one for each row — with north-facing windows that take full advantage of the soft northern light. The building doubled the size of the existing facility with 12,000 square feet of flexible galleries, including the first galleries dedicated to permanent collection. The museum includes educational and multi-purpose spaces, café and kitchen. The design incorporates administrative offices and onsite space for storage and care of the permanent collection. To support the architect’s vision for a clean minimalist building, all mechanical equipment was tucked away in the cellar and crawl spaces. As part of design team at Buro Happold’s New York office, Mr. Morozov conceived a geothermal heating and cooling plant that took advantage of high water table below the site. Geothermal water was pumped from 6 standing column wells, circulated through reversible heat pump chillers and dumped into 6 discharge wells downstream. The reversible chillers use ground source water to generate 45-degree water in the summer and 85-degree water in the winter. For even better energy efficiency the heat pump chillers were paired with displacement ventilation. Unlike overhead air supply, displacement ventilation air cools or heats the space with moderately cool or warm air. Custom air-handlers also were located in the cellar spaces. Air distribution was limited to building’s perimeter with supply ducts running in the oversized crawl space.