top of page

Winter to Spring - What It Means for IAQ, Energy Efficiency and Building Performance

Learn how the winter-to-spring transition affects indoor air quality (IAQ) and energy efficiency in commercial buildings. Explore seasonal challenges, cost impacts, and strategies for filtration, ventilation, and ESG performance.

Ava Montini

Mar 3, 2026

Written by 

Published on

Tags

The transition from winter to spring represents a notable shift in how buildings interact with their environment. While summer and winter tend to dominate operational planning, the periods in between often reveal the most about how systems perform.


During this seasonal change, outdoor temperatures fluctuate widely, and HVAC equipment may operate in both heating and cooling modes within the same week. At the same time, indoor environments are beginning to reflect new pressures: higher humidity, increased pollen levels, and shifts in outdoor particulate matter, all of which directly influence indoor air quality.


Unlike peak seasons, where energy demand is more predictable, the spring shoulder season creates variable conditions that highlight both strengths and weaknesses in building performance. This makes it a particularly relevant time to examine how ventilation strategies, filtration, humidity control, and monitoring systems function together.


Why the Transition Season Matters


During the winter months, most buildings are sealed tightly, which means indoor air is shaped mainly by what happens inside: CO₂ from people, plus everyday pollutants from activities and equipment.


As spring arrives, conditions change. Outdoor air becomes warmer and more humid. Pollen levels rise, and fine dust and particulates increase as the ground thaws and traffic increases. Bringing in more outdoor air during this time can help refresh indoor spaces, but it also means higher energy use to condition that air and the challenge of managing new contaminants.


This creates a tension between air quality and energy performance.


Without seasonal adjustment, several common issues emerge:


  1. System strain

HVAC equipment cycles on and off more often as outdoor temperatures swing, which can wear down components.


  1. Air quality drift

Pollen and particulates are more likely to slip indoors when filters aren’t adequate or properly maintained.


  1. Moisture buildup

Higher humidity increases the chance of mold or microbial growth in ducts and occupied spaces.


  1. Energy waste

Ventilation systems that aren’t tuned for the season often bring in more outside air than needed, raising utility costs.


Research from Lawrence Berkeley National Laboratory (LBNL) shows that economizers are improperly functioning in approximately 20–40% of commercial buildings, resulting in unnecessary energy use during the shoulder seasons.


U.S. DOE research shows that re-tuning building controls and HVAC sequences can reduce building energy use by more than 10 percent by correcting inefficient operations identified during mild weather transitions.


EPA and DOE modeling shows that increasing outside air flow without optimized controls can raise annual HVAC energy costs by approximately 2% to 18%, depending on climate and system configuration.


This translates directly into higher operating costs, elevated carbon intensity, and increased tenant complaints, particularly as occupants become more sensitive to air quality concerns.


What to Do Now?

The winter-to-spring transition acts as a natural diagnostic window. Variability reveals faults that may remain hidden during peak heating or cooling seasons.


Recommission Controls

Seasonal swings often expose calibration errors, damper malfunctions, and overridden sequences. Recommissioning projects have been shown to reduce building energy consumption by 10–20%, with typical measured savings in the 5–15% range and short payback periods of a few years.


Focus areas:

  • Temperature and humidity sensor calibration

  • Economizer functionality verification

  • Clearing manual overrides

  • Verifying demand-controlled ventilation (DCV) logic


Upgrade Filtration

Spring increases exposure to pollen, mold spores, and fine particulates. The U.S. Environmental Protection Agency recommends MERV-13 or higher filtration in commercial buildings where system design allows, citing measurable reductions in PM₂.₅ and improved occupant health outcomes.


Importantly, filtration upgrades must consider pressure drop. High-efficiency filters that significantly increase static pressure can elevate fan energy consumption and strain equipment. Low-pressure, high-efficiency filtration solutions help avoid this trade-off.


Optimize Ventilation Strategy

Outdoor air in spring can provide “free cooling” opportunities, but it can also carry pollutants and add to conditioning loads if not carefully managed. Economizers should be tuned for performance, and demand-controlled ventilation (DCV) should align intake with occupancy levels.


Field studies published in peer-reviewed journals have demonstrated that properly implemented demand-controlled ventilation (DCV) strategies can reduce ventilation-related energy consumption by up to 60% compared with traditional control approaches while maintaining indoor air quality.


Ventilation should respond to:

  • Occupancy (CO₂ levels)

  • Outdoor enthalpy conditions

  • Humidity thresholds


Manage Humidity

Relative humidity plays a major role in both comfort and health outcomes. ASHRAE and associated research show that maintaining indoor relative humidity between 40% and 60% corresponds with the least favorable survival conditions for microorganisms while also reducing symptoms of dry or irritated mucous membranes.


Spring often marks the point where latent load increases. Without monitoring, buildings drift into conditions that elevate mold risk and respiratory irritation.


Track IAQ in Real Time

Monitoring key indicators such as CO₂, PM₂.₅, and relative humidity provides a more accurate picture of performance than relying solely on tenant feedback. Real-time IAQ tracking reduces reliance on reactive tenant complaints and supports ESG reporting transparency. Increasingly, investors expect verifiable indoor environmental quality metrics alongside carbon reporting.


The Business Case

The winter-to-spring transition can carry financial implications beyond utility bills.


Short cycling accelerates compressor wear and reduces equipment lifespan. Poor humidity control increases duct and insulation degradation. Over-ventilation inflates both energy costs and Scope 2 carbon intensity.


CBRE’s 2025 Americas Office Occupier Sentiment Survey found that 37% of occupiers consider indoor air quality a key amenity that influences rent negotiations and leasing decisions, highlighting its role in tenant retention and satisfaction


For portfolio operators, shoulder season inefficiencies compound into:

  • Elevated summer demand charges

  • Higher carbon intensity metrics

  • Reduced mechanical lifespan

  • Increased unplanned maintenance


Spring performance is an early indicator of how well a building will handle peak-season demand. Addressing inefficiencies now protects both operating budgets and long-term capital planning.


The change from winter to spring can be a revealing period for building operations.


Buildings that respond intelligently to variability (balancing ventilation, filtration, humidity control, and energy optimization) reduce waste, improve indoor air quality, and protect long-term asset value.


The portfolios that treat the shoulder season as a diagnostic opportunity rather than a passive transition are better positioned for resilience, tenant retention, and ESG alignment.


Rather than viewing spring as a challenge, it can serve as a performance checkpoint. One that strengthens operational control before the demands of summer arrive.

How to Understand and Manage Wildfire Risks: A Comprehensive Guide for Consumers and Businesses

  • Writer: Jennifer Crowley
    Jennifer Crowley
  • Jun 28, 2024
  • 3 min read

Updated: Jul 15, 2024

Man in PPE vest holds a caution sign amidst forest brush on fire
As climate change continues to impact our environment, it’s crucial to understand wildfire risks and take proactive steps to manage them.

Wildfires are becoming a more frequent and severe threat across North America, posing significant risks to both homes and businesses. As climate change continues to impact our environment, it’s crucial to understand wildfire risks and take proactive steps to manage them. At Blade Air, we are committed to providing the knowledge and tools necessary to protect your property and health from the adverse effects of wildfires.


Understanding Wildfire Risks

Wildfires can ignite due to various reasons, including human activities and natural causes like lightning. Understanding the dynamics and risks of wildfires is essential for effective management.


Geographic and Environmental Factors

  1. Climate and Weather Patterns: Dry, hot, and windy conditions significantly increase wildfire risks.

  2. Vegetation: Dense forests, woodlands, and areas with dry grass are more susceptible to wildfires.

  3. Topography: Fires spread more quickly uphill due to rising heat. Steep terrain can also complicate firefighting efforts.


Human Factors

  1. Urban-Wildland Interface: Areas where human development meets undeveloped wildlands are particularly vulnerable.

  2. Fire Management Practices: Poor land management, such as the accumulation of dead vegetation, can escalate fire risks.


Steps to Manage Wildfire Risks

Both consumers and businesses can take proactive measures to mitigate wildfire risks and protect their properties. Here are comprehensive steps to consider:


Before Wildfire Season

  1. Assess Your Risk:

    1. Use tools like CAL FIRE’s Fire Hazard Severity Zone maps (USA) and the Canadian Wildland Fire Information System (Canada) to understand your risk.

    2. Evaluate factors such as building materials, landscaping, and proximity to vegetation.

  2. Create a Defensible Space:

    1. Clear flammable vegetation within 30-100 feet of your property.

    2. Use fire-resistant landscaping and maintain a well-watered lawn.

    3. Ensure trees and shrubs are well-spaced and pruned.

  3. Prepare Your Property:

    1. Use fire-resistant building materials like metal or tile roofing and dual-pane windows.

    2. Remove combustible materials from decks and nearby structures.

    3. Keep gutters and roofs clear of dry leaves and debris.

    4. Install spark arrestors on chimneys.

    5. Ensure hoses and fire extinguishers are readily accessible.


Develop an Emergency Plan

  1. Create an Evacuation Plan:

    1. Identify multiple evacuation routes from your neighbourhood or business location.

    2. Designate a meeting place and an out-of-area contact for family members and employees.

    3. Practice evacuation drills regularly.

  2. Assemble an Emergency Kit:

    1. Include a 3-day supply of non-perishable food and water (4 litres per person per day).

    2. Pack a first aid kit, sanitation supplies, a battery-operated radio, flashlights, and extra batteries.

    3. Keep important documents (ID, insurance policies, medical records) in a fireproof and portable container.

    4. Include prescription medications, eyeglasses, cash, and a manual can opener.


During Wildfire Season

  1. Monitor Conditions:

    1. Stay informed through local news, radio, and emergency alert systems.

    2. Keep track of air quality through websites like AirNow.gov (USA) and AirHealth.ca (Canada).

  2. Protect Indoor Air Quality:

    1. Create a “clean air room” using high-efficiency air purifiers with true HEPA filters.

    2. Ensure HVAC filters are replaced as needed

    3. Seal windows and doors and use weatherstripping to minimize smoke infiltration.

    4. Avoid indoor activities that generate pollutants, such as smoking or burning candles.

  3. Be Ready to Evacuate:

    1. Keep your emergency kit and important items in an easily accessible location.

    2. Park vehicles facing outward with a full tank of gas.

    3. Follow evacuation orders promptly. Do not delay leaving if you feel unsafe.


After a Wildfire

  1. Inspect and Repair:

    1. Check your property for damage, including roofs, exterior walls, and HVAC systems.

    2. Contact your insurance company to report losses and begin the claims process.

    3. Replace all air filters.

  2. Maintain Indoor Air Quality:

    1. Continue using air purifiers until outdoor air quality returns to safe levels.

    2. Replace filters in all air purification systems and HVAC units exposed to smoke and ash.

  3. Update Your Plan:

    1. Reflect on your emergency response and update your wildfire preparedness plan accordingly.

    2. Replenish any used supplies in your emergency kit.

    3. Schedule an air quality consultation to optimize your indoor environment for future fires.


You can learn more using our comprehensive ebook "The Ultimate Guide to Indoor Air Quality During Wildfires".


Blade Air: Partnering in Fire Risk Management

Blade Air’s commitment to innovation and sustainability extends to our wildfire preparedness solutions. Our advanced air purification systems, such as the HCFM-1 Portable HEPA Purifier, Pro Filter with Advanced Electromagnetic Filtration, and HEPA+ Filter, provide unmatched protection against wildfire smoke and other airborne contaminants.


Benefits of partnering with Blade Air:

  • High-Efficiency Filtration: True HEPA, activated carbon filters and electromagnetic filtration ensure clean indoor air during wildfire events.

  • Energy Efficiency: Our designs reduce energy consumption, making our purifiers both effective and environmentally friendly.

  • Comprehensive Coverage: Suitable for both residential and commercial spaces, ensuring wide-ranging protection.


Understanding and managing wildfire risks requires a proactive approach, blending knowledge and practical steps. By following these guidelines and utilizing Blade Air’s advanced solutions, you can safeguard your health and property from the impacts of wildfires.


Breathe innovation. Breathe sustainability. Breathe easy with Blade Air.


Explore expert insights, stay up-to-date with industry events, and gain a deeper understanding of the developments shaping the built environment.

​

Subscribe to our monthly newsletter below for exclusive early access to Blade's Insights content.

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