top of page

Rethinking HVAC: Decarbonization, Energy Efficiency, and Indoor Air Quality

Decarbonizing HVAC systems cuts emissions and boosts efficiency. Explore how sustainable HVAC tech is transforming indoor air quality.

Ava Montini

Nov 14, 2024

Written by 

Published on

Tags

In an era where climate change, energy consumption, and public health intersect, the way we design, operate, and innovate within our buildings has never been more critical. At the heart of this transformation lies the HVAC (Heating, Ventilation, and Air Conditioning) system.


Although typically hidden from sight, HVAC infrastructure plays a crucial role in energy use, indoor air quality (IAQ), and carbon emissions. A closer look reveals that HVAC systems profoundly impact a building’s functionality, environmental footprint, public health outcomes, and operational efficiency.

The Energy-Intensive Reality of HVAC Systems

HVAC systems are among the largest energy consumers in residential and commercial buildings, often responsible for a significant portion of a building’s operating costs and environmental footprint. In the United States alone, HVAC accounts for approximately 35% of a building's energy consumption, a figure that can be even higher in colder and warmer climates due to increased heating and cooling demands. According to the 2021 Global Status Report for Buildings and Construction by the GlobalABC, the buildings sector accounted for 36% of global final energy consumption and 37% of energy-related CO₂ emissions in 2020.


Historically, HVAC systems have been energy-intensive by nature, using vast amounts of power to regulate temperature and maintain air quality within a building. This often places HVAC at the center of energy-saving and decarbonization initiatives. However, balancing energy efficiency with effective indoor air quality control has proven challenging.


Ventilation, which is essential for good IAQ, typically requires large volumes of air to be exchanged, a process that consumes significant energy and raises costs. This trade-off between energy savings and IAQ improvement has long hindered the HVAC industry’s transition to sustainable practices.


The Cost of Compromised Indoor Air Quality

Indoor air quality plays a vital role in health, well-being, and productivity. Poor IAQ has been linked to respiratory diseases, allergies, and even mental fatigue, while the economic cost of inadequate IAQ often goes unmeasured. The World Health Organization estimates that air pollution contributes to more than 4 million premature deaths each year, with indoor air pollution being a significant factor. Studies indicate that improved IAQ can reduce health risks and enhance cognitive function, particularly in office and educational settings where individuals spend extended hours indoors.


A study by the Harvard T.H. Chan School of Public Health found that participants in green office environments experienced a 61% improvement in cognitive scores, while those in green+ environments with enhanced ventilation saw scores double compared to conventional settings, underscoring the link between IAQ and productivity. Improved indoor air quality also reduces absenteeism, as shown by a U.S. Environmental Protection Agency (EPA) study reporting a 10% decrease in student absences with better IAQ, and additional research indicating that increased office ventilation can reduce short-term employee absences by 35%. These findings emphasize the importance of maintaining optimal IAQ in both educational and professional settings for health and productivity.


Comparing Outdoor vs. Indoor Air Quality

While outdoor air pollution often captures public attention, indoor air pollution can pose even greater health risks, largely because people spend nearly 90% of their time indoors. Without proper ventilation and filtration, indoor spaces can accumulate pollutants over time, creating high-risk environments even in areas where outdoor air is relatively clean. Indoor pollutants, such as volatile organic compounds (VOCs) from cleaning products, chemicals from building materials, and particulate matter from HVAC systems, often reach levels that are two to five times higher than outdoor levels. Compounding this, outdoor pollution or environmental factors, like wildfire smoke or high pollen counts, can seep indoors, adding to the burden on indoor air quality if not properly managed.


Bridging the Gap Between IAQ and Energy Efficiency

The perception that energy savings and optimal IAQ are mutually exclusive has evolved with advances in HVAC technology. New systems now offer solutions that provide fresh, filtered air without excessive energy consumption. Energy-efficient HVAC systems are equipped with features like variable-speed compressors, heat exchangers, and intelligent sensors that adjust airflow based on occupancy and usage patterns, more effectively balancing IAQ and energy use.


Key Technologies Redefining IAQ and Energy Efficiency in HVAC:

  1. Variable Refrigerant Flow (VRF) Systems: These systems allow precise control over the cooling and heating of each zone within a building, reducing energy consumption by eliminating the need to heat or cool unused areas.


  2. Heat Recovery Ventilation (HRV) Systems: HRVs reclaim heat from outgoing air and transfer it to incoming air, reducing the energy required to maintain indoor temperatures.


  3. Demand-Controlled Ventilation (DCV): DCV uses sensors to monitor CO2 levels and occupancy within a space, adjusting ventilation rates dynamically. This reduces unnecessary energy use and enhances air quality by providing fresh air only when needed.


  4. Low-Pressure Advanced Filtration: Low-pressure polarized filters efficiently capture pollutants like VOCs and fine particles with minimal airflow resistance, supporting energy and operational efficiency.


  5. Smart Thermostats and Building Automation: These systems enable HVAC units to operate at optimal efficiency by learning usage patterns, predicting occupancy, and adjusting temperature and ventilation levels based on real-time data.


The Role of HVAC in Building Decarbonization

With buildings accounting for nearly 40% of global energy consumption, they play a significant role in carbon emissions. Decarbonizing HVAC systems involves reducing direct emissions from fossil-fuel systems and minimizing indirect emissions through energy efficiency improvements. Efforts to decarbonize increasingly focus on electrifying heating, integrating renewable energy, and adopting advanced technologies that can greatly lower a building’s carbon footprint.


Pathways to Decarbonize HVAC Systems:


  1. Electrification of HVAC: Transitioning from gas boilers and furnaces to electric heat pumps can significantly cut direct emissions from fossil fuels. Paired with renewable energy sources, electric heat pumps further reduce both emissions and operating costs.


  2. Use of Renewable Energy: Integrating renewable sources like solar panels and wind power with HVAC systems reduces reliance on grid electricity. When HVAC systems are powered by renewable energy, buildings can move closer to achieving net-zero emissions.


  3. District Heating and Cooling Systems: Serving multiple buildings from a centralized plant, district heating and cooling systems dramatically reduce energy consumption and emissions. These systems are highly effective in urban areas and industrial complexes, where centralized efficiency can impact entire communities.


  4. Energy Storage and Peak Shaving: Battery storage systems allow buildings to store off-peak energy for later use, lowering demand on the grid and reducing costs. This approach also decreases the carbon footprint by reducing peak-time energy consumption.


  5. Low-Pressure, High Dust Loading Filtration: Low-pressure, high dust-loading filtration technology enables HVAC systems to maintain excellent indoor air quality without increasing energy consumption. By reducing strain on HVAC systems, these filters help optimize energy usage, creating a balanced, low-energy approach to superior indoor air quality. In high-traffic and sensitive environments, this filtration technology promotes sustainability and health but also contributes to lower peak energy demand and overall kWh usage.


Smart HVAC through Real-Time Data and Technology

Smart HVAC systems leverage IoT sensors, AI, and machine learning to enhance building management by providing real-time insights into temperature, occupancy, and indoor air quality (IAQ). IoT sensors enable systems to adjust settings based on occupancy and external conditions, optimizing comfort and reducing energy use. For example, unoccupied zones can automatically receive less heating or cooling, saving energy without sacrificing comfort.


Predictive maintenance is another key feature. It uses data to anticipate and address minor issues before they escalate, reducing repair costs and extending system lifespan. Machine learning further enhances efficiency by learning from usage patterns to optimize settings dynamically, reducing overall energy consumption. IAQ sensors adjust ventilation in response to pollutants, ensuring healthy indoor air, especially in high-occupancy environments like schools and hospitals.


This adaptive functionality not only lowers operational costs and peak energy demand but also supports sustainability goals by reducing carbon footprints. Smart HVAC systems offer continuous optimization, making buildings more resilient, efficient, and environmentally responsible.


Economic Incentives for Sustainable HVAC Systems

The economic benefits of sustainable HVAC upgrades are extensive. Although energy-efficient technology often requires an initial investment, the long-term savings in reduced energy bills can be substantial. Additionally, building owners may qualify for government incentives, grants, and rebates aimed at supporting energy-efficient retrofits. These financial incentives help offset initial costs, making sustainable HVAC upgrades more financially accessible.


Examples of Government Incentives

These incentives make sustainable HVAC systems more affordable and accessible, encouraging widespread adoption and supporting overall energy efficiency and decarbonization efforts.


Future-Proofing Buildings with Sustainable HVAC Solutions

The global transition to net-zero emissions by 2050 hinges on making our built environments sustainable and resilient. HVAC systems, with their substantial energy demands and carbon impact, are essential to this transformation. By embracing energy-efficient and decarbonized HVAC technologies, we can future-proof buildings against rising energy costs, regulatory changes, and environmental pressures.


This shift goes beyond simply improving IAQ or reducing energy bills; it’s about creating spaces where sustainability, health, and operational efficiency coexist. Clean, breathable air is not just a perk—it’s a necessity for well-being and productivity. Likewise, efficient, low-emission buildings are essential for a low-carbon economy.



The future of HVAC is evolving in a way that aligns energy efficiency, decarbonization, and indoor air quality as complementary goals. This shift challenges the traditional trade-offs between these objectives, proving that clean air and efficient energy use can coexist without compromise. HVAC systems of the future will be integrated, smart, and sustainable, paving the way for buildings that are not only more environmentally responsible but also healthier and more enjoyable to inhabit.


With ongoing innovations in HVAC technology, we are reaching a point where buildings can actively contribute to sustainability and public health, setting a new standard for what it means to operate a truly green building. By adopting these advanced systems, we are moving toward a reality where indoor spaces can maintain optimal air quality, reduce energy waste, and significantly cut emissions, creating a cleaner, more sustainable world.

Writer's pictureAva Montini

Navigating Scope 1, 2, and 3 Carbon Emissions

A Guide for Transparent and Responsible Reporting in Commercial Facilities


In the face of growing climate concerns, businesses across industries are under increasing pressure to account for their environmental impact. One of the most significant measures of this impact is a company's carbon footprint, which encompasses the total greenhouse gas (GHG) emissions produced directly or indirectly by its activities. To tackle this challenge, companies must engage in transparent and comprehensive emissions reporting—a practice that has become essential for regulatory compliance but also for building trust with stakeholders, including customers, investors, and employees.


The Greenhouse Gas Protocol, developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), is the leading global standard for measuring and reporting emissions. It introduces a structured approach by categorizing emissions into three scopes: Scope 1, Scope 2, and Scope 3.


Each scope helps companies pinpoint where emissions originate, from direct operations to the broader supply chain, enabling them to develop targeted strategies for emissions reduction. This structured approach is particularly crucial in energy-intensive sectors like commercial facilities and HVAC, where emissions are high and the potential for meaningful reductions is significant.


The Importance of Comprehensive Carbon Emissions Reporting

According to the International Energy Agency (IEA), the built environment, which includes all residential, commercial, and industrial buildings, is responsible for nearly 30% of global energy-related carbon emissions.


Within this sector, commercial facilities play a pivotal role in emissions reduction efforts, as they are among the largest consumers of energy due to heating, ventilation, and air conditioning (HVAC) demands. By publicly reporting their emissions across all three scopes, businesses in this sector contribute to global climate goals and also position themselves for competitive advantage and regulatory readiness.


Transparent emissions reporting goes beyond compliance; it is an opportunity for companies to show leadership in sustainability. The Carbon Disclosure Project (CDP), an international non-profit that promotes transparency in environmental reporting, reports that over 13,000+ companies worldwide now disclose emissions data across their value chains (CDP). This shift toward transparency reflects a growing understanding that managing and reducing emissions is essential to business resilience in a low-carbon economy. For commercial facilities, adopting this practice is not only an ethical choice but also a strategic move to improve efficiency, reduce operational costs, and align with the expectations of eco-conscious clients and investors.


What Are Scope 1, 2, and 3 Emissions?

Companies need to understand the different types of emissions their operations produce to effectively manage and reduce carbon emissions. The Greenhouse Gas Protocol breaks these emissions into three distinct categories, or "scopes," which help businesses identify and take responsibility for their environmental impact across their entire value chain.


Each scope represents a different layer of emissions accountability, from the direct emissions produced by a company’s own operations to the indirect emissions generated throughout its supply chain. This categorization is particularly useful for large organizations, like commercial facilities, where energy use spans multiple levels, from on-site equipment to energy purchased for heating and cooling, and even to the emissions generated by suppliers and end-users. By analyzing emissions through the lens of Scope 1, 2, and 3, companies can more accurately track their carbon footprint, prioritize areas for improvement, and create targeted reduction strategies that align with broader sustainability goals.


This approach also allows businesses to communicate their efforts transparently to stakeholders, showing precisely where emissions occur and the steps being taken to reduce them. As the demand for sustainability intensifies, investors, regulatory bodies, and consumers alike are increasingly expected to expect this level of transparency, as they are looking for companies that demonstrate a proactive approach to managing their environmental impact.


Scope 1



Direct Emissions from Owned or Controlled Sources

Scope 1 emissions cover direct greenhouse gas emissions from sources that a company owns or controls, such as vehicle emissions, fuel combustion in on-site equipment, or leaks from refrigerant systems. For commercial facilities, sources of Scope 1 emissions often include HVAC systems, heating and cooling equipment, and standby power generators. The Department of Energy (DOE) notes that HVAC systems alone account for 35% of energy consumption in commercial buildings, highlighting a significant opportunity for direct emissions reduction.


For a commercial facility, Scope 1 emissions might come from company-owned generators used for backup power during outages.


Mitigation Strategies and Examples

Reducing Scope 1 emissions requires examining on-site equipment and fuel use. Strategies for Scope 1 emissions reductions often include electrification, biofuel adoption, and/or refrigerant management.


Electrification and Energy Source Conversion

Many companies are shifting away from fossil fuels, replacing natural gas or oil with electric heating, solar thermal systems, or biofuels. According to BloombergNEF, electrifying buildings, alongside other key sectors, could reduce global carbon emissions by approximately 20-25% by 2050, as part of the transition to a net-zero future.


Refrigerant Management

Low-GWP (Global Warming Potential) refrigerants can significantly cut emissions from cooling systems. The U.S. Environmental Protection Agency's (EPA) GreenChill Partnership highlights that transitioning to low-global warming potential (GWP) refrigerants can significantly reduce CO₂ emissions. While specific figures per building may vary, the program emphasizes substantial environmental benefits through the adoption of environmentally friendlier refrigeration systems.


Scope 2


Indirect Emissions from Purchased Energy

Scope 2 emissions are associated with the generation of purchased electricity, steam, heating, or cooling consumed by a business. For commercial facilities, these emissions are often tied to energy-intensive systems, such as HVAC, lighting, and IT infrastructure.


A data center’s Scope 2 emissions largely stem from the purchased electricity that powers its servers and cooling systems.


Mitigation Strategies and Examples


Addressing Scope 2 emissions involves both reducing overall energy consumption and transitioning to cleaner energy sources, helping businesses minimize the environmental impact of the electricity, heating, and cooling they purchase. By focusing on these areas, companies can strategically lower their indirect emissions and support a more sustainable energy system.


Energy Efficiency Upgrades

Energy-efficient HVAC systems, such as those with low-pressure drop air filters like Blade Air's Pro Filter, reduce the energy needed for heating and cooling. Implementing high-efficiency HVAC systems can decrease HVAC energy use by an average of 15%.


Renewable Energy Certificates (RECs) and On-Site Renewables

Purchasing RECs allows companies to offset Scope 2 emissions by supporting renewable energy generation. Additionally, on-site solar panels can directly reduce reliance on grid-supplied electricity, minimizing carbon intensity (National Renewable Energy Laboratory).


Scope 3


Indirect Emissions from the Value Chain

Scope 3 emissions are the most complex category, covering indirect emissions both upstream and downstream, including the production of purchased goods, transportation, employee commuting, and even the end use of products. As the World Economic Forum (WEF) notes, Scope 3 emissions typically constitute 70% of a company's total emissions (WEF). For commercial facilities, these can include emissions from manufacturing and transporting building materials, waste disposal, and even tenant activities.


Scope 3 emissions could include the emissions produced when employees commute to work or travel for business meetings.


Mitigation Strategies and Examples

Scope 3 emissions require collaboration across the supply chain and often involve initiatives that encourage sustainable practices among suppliers, employees, and customers.


Supplier Sustainability Programs

Engaging suppliers to reduce upstream emissions can drastically affect Scope 3 emissions. Many organizations, including Blade Air, work with suppliers on sustainability improvements and seek out environmentally responsible partners.


Product Lifecycle and End-of-Life Management

Promoting products that support circular economy principles, such as Blade Air's recyclable filter pads, helps minimize waste and cut down on Scope 3 emissions from disposal.


Common Sources of Scope 1, 2, and 3 Emissions


Understanding the primary sources of carbon emissions within Scope 1, 2, and 3 categories is essential for effective emissions management. Each scope encompasses specific activities, both direct and indirect, that contribute to a business's overall greenhouse gas (GHG) footprint.


Scope 1: Direct Emissions (Our Operations)


Scope 1 emissions are direct emissions that come from sources owned or controlled by a business.


Common sources include:

  • Fleet Fuel Use: Emissions from company-owned vehicles, such as delivery trucks, service vans, and other fleet vehicles, contribute significantly to Scope 1 emissions.

  • Stationary Combustion: Natural gas or other fuels are used for power generation and fuel use in boilers, furnaces, and other on-site equipment.

  • Fugitive Emissions are unintentional leaks from equipment such as air conditioning units or refrigerant systems. They also include leaks of gases like SF₆ (sulphur hexafluoride) used in electric equipment.

  • LNG Venting and Fuel: For companies in sectors like energy, liquefied natural gas (LNG) venting or use in operations contributes to direct emissions.


Scope 2: Indirect Emissions (Energy Purchased)


Scope 2 emissions stem from the generation of purchased electricity, heat, and steam. Although the energy is produced elsewhere, the end-use emissions are attributed to the company using the energy.


Common sources include:

  • Electricity Consumption: Energy used for lighting, HVAC systems, IT infrastructure, and other equipment within facilities.

  • Transmission and Distribution Losses: Emissions associated with the energy lost during the transmission and distribution of electricity to the business.

  • Liquefied Natural Gas (LNG): In certain cases, LNG used for electricity generation may contribute to Scope 2 emissions when used as a purchased source.


Scope 3: Indirect Emissions (Value Chain Upstream and Downstream)


Scope 3 emissions are indirect emissions from sources not owned or directly controlled by the business, covering both upstream and downstream activities in the value chain. These emissions are often the largest and most complex to manage. Common sources include:


Upstream Emissions

  • Purchased Goods and Services: Emissions from the production and transportation of goods and services a business buys.

  • Business Travel and Employee Commuting: Emissions from air travel, hotel stays, and employee commuting contribute to a company’s carbon footprint.

  • Waste Management: Disposal and treatment of waste generated in business operations can lead to emissions, especially if waste is incinerated or sent to landfills.

  • Upstream Fuel Emissions: Emissions related to the extraction, production, and transportation of fuels before they are consumed.


Downstream Emissions:

  • Product Use: Emissions from the use of products sold by the business, such as fuel combustion in customer-owned vehicles or equipment.

  • End-of-life disposal is the disposal or recycling of products after their use, including any emissions associated with product breakdown or disposal.

  • Transmission and Distribution of Sold Energy: Losses incurred in energy distribution to end-users also contribute to downstream emissions.


By identifying these common sources within each scope, companies can develop targeted strategies to reduce their GHG emissions, whether by improving energy efficiency in operations, switching to renewable energy sources, or working with suppliers to adopt sustainable practices. Addressing emissions across all scopes is critical to achieving comprehensive carbon management and meeting sustainability goals.


The Intersection of Indoor Air Quality and Energy Consumption


Indoor air quality (IAQ) is essential for the health and productivity of building occupants, but it also significantly impacts a facility's energy consumption and emissions profile. According to the U.S. Department of Energy, heating, ventilation, and air conditioning (HVAC) systems account for approximately 35% of the energy used in commercial buildings. This high energy demand contributes heavily to Scope 2 emissions, underscoring the importance of efficient HVAC management as part of a comprehensive carbon reduction strategy.


A Harvard School of Public Health study found that improved IAQ can enhance cognitive function and productivity by 61%, with energy-efficient ventilation solutions helping companies meet both health and sustainability goals.


Adopting a thorough approach to Scope 1, 2, and 3 emissions reporting is essential for commercial facilities to meet regulatory standards, build stakeholder trust, and drive industry innovation. With HVAC systems as a primary focus for emissions and IAQ, companies have a unique opportunity to reduce energy demand, improve indoor air quality, and support a healthier, more sustainable built environment.


Blade Air is dedicated to helping facilities navigate these goals through energy-efficient, low-impact air filtration solutions. By integrating emissions management with IAQ improvements, businesses can make strides toward a carbon-neutral future while creating healthier, more resilient workplaces—setting a new standard for sustainable, responsible operations.

Explore expert insights, stay up to date with industry events, and gain a deeper understanding of the cutting-edge developments that are revolutionizing the indoor air quality landscape within Blade Air's comprehensive Insights Hub.

You can also subscribe to our monthly newsletter below for exclusive early access to Blade's Insights content, uncovering tomorrow's air quality advancements before they hit our Hub.

Insights Hub

Lorem ipsum dolor sit amet, consec tetur adipiscing elit. Sit quis auctor 

Lorem ipsum dolor sit amet cotetur 

Lorem ipsum dolor sit amet, consec tetur adipiscing elit. Sit quis auctor 

Lorem ipsum dolor sit amet cotetur 

Lorem ipsum dolor sit amet, consec tetur adipiscing elit. Sit quis auctor 

Lorem ipsum dolor sit amet cotetur 

bottom of page