Very High Efficiency Dedicated Outside Air Systems

Dedicated outside air systems (DOAS) separate heating and cooling from the ventilation system to allow for optimal control of each of these critical building functions. Building on the DOAS concept, a very high efficiency DOAS includes heat recovery ventilation and focuses on increased equipment efficiency and optimized system design. When compared to a code-minimum system upgrade, very high efficiency DOAS can reduce commercial building energy use by an average of 36%, and HVAC energy use by an average of 65%.

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4 Reasons to Upgrade Your HVAC Using a Very High Efficiency DOAS Approach

Looking to upgrade your HVAC? Learn more about very high efficiency DOAS and what you should consider when planning your upgrade.

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Very High Efficiency DOAS Comprehensive Design Guide

An educational and reference tool for industry stakeholders, building owners and designers in the Northwest to expand the application of very high efficiency DOAS.

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High-Performance HVAC Can Reduce Energy Use in Commercial Buildings by an Average of 36%

Dedicated outside air systems (DOAS) separate heating and cooling from the ventilation system to allow for optimal control of each of these critical building functions. Building on the DOAS concept, a very high efficiency DOAS includes heat recovery ventilation and focuses on increased equipment efficiency and optimized system design. This approach has been proven to yield significant energy and cost savings in new and existing commercial buildings while providing better indoor air quality and improved occupant comfort.

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It's A New Day for Efficiency and Comfort at Portland Preschool

In operation for more than 40 years, New Day School has a deep commitment to environmentally friendly and sustainable practices. When New Day School’s Kishalay building required a renovation, the preschool’s leadership team quickly committed to adopting advanced practices and products to ensure the renovations would result in a net-zero energy building.

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New-School HVAC Approach Improves Comfort and Air Quality for K-12 Students

Motivated to improve the air quality and thermal comfort of their elementary school while reducing monthly energy costs, school administrators of Monument Grade School in Monument, Oregon, sought a new HVAC solution.

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Legal Firm Objects to Older Building's Inefficiencies and Discomfort

Local law firm Immix Group purchased the upper floor of a 1909, two-story historic building in the once-industrial area of Northwest Portland. Vacant for nearly three years, the 12,000-square-foot space presented many comfort challenges. Air leaked between floors, the fresh air dampers were all closed shut, and the oversized existing HVAC system was aging and inefficient.

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Innovative HVAC Approach Helps Airport's Energy Savings Take Off

Although a two-story, 1930s airport terminal building in Seattle underwent a major renovation in 2002, the HVAC was largely untouched. The duo of large, multizone rooftop units (RTUs) were left in place, with a third unit of the same type added during the renovations. This inefficient HVAC system wasted energy and money, led to inconsistent temperatures, and caused severe occupant discomfort.

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High-Performance HVAC Gets to Work for Utility Office

Flathead Electric’s district office is a single-story 1960s-vintage building with offices at the front and a combination of storage space and garage bays for utility trucks in the back. Their former HVAC system had been pieced together from several years of changes and modifications and it was no longer providing indoor comfort or an adequate level of heating efficiency. Flathead Electric took advantage of an innovative approach to HVAC they knew all to well—a very high efficiency dedicated outside air system (also referred to as very high efficiency DOAS).

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Trapper Creek Dorm Snares Energy Savings for Good

The Trapper Creek Dormitory is a federal government work campus in rural Montana. When restricted airflow caused summertime overheating, ventilation issues, and unsafe C02 levels in their dormitories, the facility managers decided to partner with Ravalli Electric Co-op and Bonneville Power Administration to implement a high-performance HVAC conversion.

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Research Firm Engineers a Smaller Energy Footprint

Ecotope, an energy efficiency engineering and research firm in downtown Seattle, outgrew their office space and decided to lease the third floor of a 3.5-story mixed-use building. The building’s existing heating and cooling equipment featured an all-electric, variable air volume (VAV) rooftop unit (RTU) with electric resistance terminal heat in the individual zones including open office areas, conference rooms, a shared breakroom and a server room.

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