Clean buildings are more energy-efficient. Dirty HVAC systems use more energy, dirty lighting produces less light per watt, and dirty windows reduce passive solar heating. This guide explains how commercial cleaning directly reduces energy costs.
Energy efficiency is a top priority for commercial building owners and facility managers. While most energy efficiency efforts focus on building systems — HVAC upgrades, LED lighting, building automation, and insulation — one of the most cost-effective energy efficiency strategies is often overlooked: professional cleaning. Clean buildings use less energy than dirty buildings. This is not a marketing claim — it is a measurable fact supported by research from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), the U.S. Department of Energy, and multiple university studies. Dirty HVAC coils can increase energy consumption by 30%, dirty lighting fixtures reduce light output by 50%, and dirty windows reduce passive solar heating benefits. For property owners looking to reduce energy costs and improve sustainability, investing in professional cleaning is one of the fastest-paying energy efficiency measures available. This guide explains the specific ways that commercial cleaning supports energy efficiency and provides a framework for building an energy-efficient cleaning program.
The U.S. Energy Information Administration reports that commercial buildings consume approximately 18% of all energy used in the United States, at a cost of over $200 billion annually. The average commercial building could reduce energy consumption by 10-20% through improved maintenance practices, including professional cleaning. For a 50,000-square-foot office building with annual energy costs of $100,000, a 10% reduction saves $10,000 per year — year after year. The investment in cleaning services that support energy efficiency is typically recovered within 6-18 months through energy savings alone, not including the additional benefits of extended equipment life and improved occupant comfort. See our building maintenance services for energy-efficient cleaning programs.
Energy Efficiency Through Commercial Cleaning
HVAC systems account for approximately 40-60% of total energy consumption in commercial buildings, making them the largest single target for energy efficiency improvements. HVAC cleaning directly affects energy performance in several ways. Dirty evaporator coils (indoor coils) are insulated by dust and dirt, reducing their ability to absorb heat from the air. The U.S. Department of Energy estimates that dirty evaporator coils can reduce HVAC efficiency by up to 30%. Regular cleaning of evaporator coils restores their heat transfer capability and reduces the energy required to cool the building. Dirty condenser coils (outdoor coils) are insulated by dirt, dust, pollen, and debris, reducing their ability to reject heat. The California Energy Commission found that dirty condenser coils can increase compressor energy consumption by 10-15%. Regular cleaning of condenser coils — typically 1-2 times per year depending on location and exposure — restores heat rejection capacity and reduces energy consumption.
Dirty air filters restrict airflow through the HVAC system, causing fans to work harder and reducing system efficiency. ASHRAE recommends that air filters be inspected monthly and replaced when they reach a pressure drop that indicates they are loaded with dust. The frequency of filter changes depends on the filter type and the building environment, but typical commercial buildings should change filters quarterly or every 3-4 months. Clean filters reduce fan energy consumption by 5-10% compared to dirty filters. Dirty supply air diffusers and return air grilles restrict airflow and distribute dust throughout the building. These components should be cleaned quarterly as part of the building’s regular cleaning program. Dirty ductwork accumulates dust that can be distributed throughout the building when the HVAC system operates. Duct cleaning should be performed every 5-7 years or more frequently in dusty environments or after construction. For HVAC maintenance cleaning, see our commercial janitorial services.
HVAC Cleaning and Energy Performance
Lighting accounts for approximately 15-25% of energy consumption in commercial buildings, making it the second-largest energy expense after HVAC. Professional cleaning directly affects lighting energy consumption. Dirty lighting fixtures — including lenses, reflectors, and lamps — reduce light output by 30-50% compared to clean fixtures. The Illuminating Engineering Society (IES) recommends that lighting fixtures be cleaned at least annually, with more frequent cleaning in dirty environments such as manufacturing facilities and restaurants. Clean fixtures produce more light per watt of energy consumed, allowing building operators to reduce the number of fixtures or lamps in use or to dim lighting systems while maintaining adequate illumination levels. The energy savings from regular lighting fixture cleaning typically range from 5-15% of lighting energy consumption, with the exact savings depending on the cleanliness level of the fixtures before cleaning and the type of fixtures in use.
Window cleaning also affects energy consumption, particularly in buildings designed to take advantage of passive solar heating and natural daylighting. Clean windows transmit more sunlight into the building, reducing the need for electric lighting during daylight hours. The U.S. Department of Energy has found that clean windows can increase natural daylight penetration by 20-40% compared to dirty windows, allowing buildings to reduce electric lighting use during the day. In winter, clean windows also allow more passive solar heat to enter the building, reducing heating energy consumption. In summer, clean windows that have been treated with low-e coatings or solar control film can reduce cooling energy by reflecting infrared radiation while transmitting visible light. Window cleaning should be performed at least twice per year, with more frequent cleaning in urban areas with higher pollution levels or in buildings near construction sites. For window and lighting cleaning services, see our window washing services.
Lighting and Window Cleaning for Energy Savings
The reflective properties of floors affect lighting energy consumption in commercial buildings. Light-colored, clean floors reflect light upward, reducing the amount of artificial lighting needed to illuminate the space. The IES calculates that floor reflectance affects lighting energy consumption by 5-15%, with clean, light-colored, polished floors providing the highest reflectance. Dirty floors absorb light rather than reflecting it, reducing the effectiveness of overhead lighting. Regular floor cleaning and maintenance — including dust mopping, damp mopping, and periodic stripping and refinishing of hard floors — maintains floor reflectance and supports lighting energy efficiency. Polished concrete floors and light-colored VCT flooring provide the highest reflectance, while dark carpet absorbs more light and requires more artificial lighting to achieve the same illumination level.
In addition to floor reflectance, the general cleanliness of the building affects occupant perception of lighting adequacy. Studies have found that occupants perceive clean, well-maintained spaces as being better lit than dirty spaces, even when lighting levels are the same. This means that building operators in clean buildings can sometimes reduce lighting levels (and energy consumption) without affecting occupant satisfaction. The relationship between cleanliness and energy efficiency extends to other building systems as well. Clean kitchen exhaust hoods and ducts operate more efficiently, reducing the energy required to ventilate commercial kitchens. Clean refrigerator and freezer condenser coils reduce compressor energy consumption by 5-15%. Clean solar panels (for buildings with solar installations) generate 10-30% more electricity than dirty panels. In every case, the energy savings from cleaning significantly exceed the cost of the cleaning service. For more on energy-saving cleaning, read our company blog.
Floor Cleaning and Reflective Properties
Optimizing cleaning schedules to support energy efficiency requires a strategic approach. The most energy-efficient approach is to clean during occupied hours when the HVAC system is already operating and lighting is already on. Cleaning during occupied hours reduces the need to run HVAC systems and lighting for extended hours just for cleaning. However, some cleaning tasks (such as floor stripping and refinishing, carpet extraction, and heavy cleaning) are better performed during unoccupied hours due to noise, odor, or disruption concerns. For these tasks, the energy impact should be minimized by using energy-efficient cleaning equipment, limiting cleaning to specific zones rather than the entire building, and scheduling cleaning to minimize the time that HVAC and lighting systems need to operate for cleaning purposes.
Energy-efficient cleaning equipment can significantly reduce the energy footprint of cleaning operations. Energy Star-certified commercial vacuums use 30-50% less energy than standard models. Battery-powered cleaning equipment (floor scrubbers, sweepers, burnishers) eliminates the energy losses associated with battery charging and is more efficient than corded electric equipment. Microfiber cleaning systems reduce water and chemical usage by 90-95% compared to traditional cotton systems, reducing the energy required to heat water for cleaning. Cold-water cleaning products eliminate the need for hot water in many cleaning applications, reducing water heating energy. Building operators should work with their cleaning contractor to select energy-efficient cleaning equipment and products and to optimize cleaning schedules for energy efficiency. The combination of energy-efficient cleaning practices and well-maintained building systems can reduce a building’s total energy consumption by 10-20% compared to standard practices.
Cleaning Schedules and Energy Optimization
Green cleaning and energy certification programs recognize the connection between cleaning practices and energy efficiency. LEED (Leadership in Energy and Environmental Design) for Existing Buildings: Operations and Maintenance includes credits for green cleaning practices, including use of certified green cleaning products, sustainable cleaning equipment, and cleaning practices that reduce environmental impact. BOMA 360 certification includes criteria for cleaning practices that support building performance, including energy efficiency. The ENERGY STAR program for commercial buildings recognizes buildings that achieve high energy performance, and cleaning practices that support energy efficiency contribute to ENERGY STAR scores. Building operators who implement green cleaning programs often find that the energy savings from improved cleaning practices help offset the cost of green cleaning products and support their sustainability goals.
The financial case for energy-efficient cleaning is compelling by any measure. A comprehensive energy-efficient cleaning program — including HVAC coil cleaning, lighting fixture cleaning, window cleaning, floor maintenance, and optimized cleaning schedules — typically costs $0.10-$0.30 per square foot annually. The energy savings from these practices typically range from $0.15-$0.50 per square foot annually, providing a positive return on investment from the first year. When the additional benefits of extended equipment life, improved occupant comfort, and sustainability certification are included, the return on investment is even higher. For building owners and facility managers looking for cost-effective strategies to reduce energy consumption, professional cleaning is one of the fastest and most reliable investments available. RBM Building Services has provided energy-efficient building maintenance, commercial cleaning, and window washing since 1974 across Utah, Arizona, Nevada, and Texas. Call 800.403.3564 or contact us for an energy-efficient cleaning consultation.
Green Cleaning and Energy Certification
Building an energy-efficient cleaning program requires integrating cleaning practices into the building’s overall energy management strategy. The first step is to conduct an energy audit that identifies the specific opportunities for energy savings through cleaning. The audit should assess the current condition of HVAC coils, filters, and ductwork, the current cleanliness of lighting fixtures and reflectors, the current cleanliness of windows and the impact on natural daylighting, and the current floor reflectance and its impact on lighting levels. Based on the audit, develop a cleaning program that prioritizes the cleaning activities that have the greatest impact on energy consumption. The program should include written specifications for energy-relevant cleaning tasks, including coil cleaning frequency and methods, lighting fixture cleaning schedule, window cleaning schedule, floor maintenance schedule for reflectance, and filter change schedule. The program should also include monitoring and verification procedures to track the energy impact of cleaning activities.
Documentation is essential for demonstrating the energy benefits of cleaning. Building operators should track cleaning activities and their impact on energy consumption, using utility bills or sub-metering data to measure energy savings before and after implementing energy-efficient cleaning practices. The energy savings from cleaning should be included in the building’s energy management reporting and should be communicated to building owners, tenants, and stakeholders. The combination of professional cleaning and energy management is a powerful strategy for reducing building operating costs and improving sustainability. As energy costs continue to rise and as sustainability requirements become more stringent, the relationship between cleanliness and energy efficiency will become increasingly important for commercial building operators. The buildings that recognize and act on this relationship will have a significant competitive advantage in operating costs and sustainability performance. RBM Building Services has provided building maintenance and commercial janitorial services since 1974. Call 800.403.3564 or contact us for an energy-efficient cleaning assessment. Read more on our company blog.
Energy-saving cleaning programs for every building
Building an Energy-Efficient Cleaning Program
Building an energy-efficient cleaning program requires integrating cleaning practices into the building’s overall energy management strategy. The first step is to conduct an energy audit that identifies the specific opportunities for energy savings through cleaning. The audit should assess the current condition of HVAC coils, filters, and ductwork, the current cleanliness of lighting fixtures and reflectors, the current cleanliness of windows and the impact on natural daylighting, and the current floor reflectance and its impact on lighting levels. Based on the audit, develop a cleaning program that prioritizes the cleaning activities that have the greatest impact on energy consumption. The program should include written specifications for energy-relevant cleaning tasks, including coil cleaning frequency and methods, lighting fixture cleaning schedule, window cleaning schedule, floor maintenance schedule for reflectance, and filter change schedule. The program should also include monitoring and verification procedures to track the energy impact of cleaning activities.
Documentation is essential for demonstrating the energy benefits of cleaning. Building operators should track cleaning activities and their impact on energy consumption, using utility bills or sub-metering data to measure energy savings before and after implementing energy-efficient cleaning practices. The energy savings from cleaning should be included in the building’s energy management reporting and should be communicated to building owners, tenants, and stakeholders. The combination of professional cleaning and energy management is a powerful strategy for reducing building operating costs and improving sustainability. As energy costs continue to rise and as sustainability requirements become more stringent, the relationship between cleanliness and energy efficiency will become increasingly important for commercial building operators. The buildings that recognize and act on this relationship will have a significant competitive advantage in operating costs and sustainability performance. RBM Building Services has provided building maintenance and commercial janitorial services since 1974. Call 800.403.3564 or contact us for an energy-efficient cleaning assessment. Read more on our company blog.
