Frequently Asked Questions

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How can I reduce my building's energy costs?

According to the U.S. Department of Energy, as much as 50% of a commercial building's energy is used to operate its HVAC system*. Higher-efficiency systems and advanced technology from Lennox can help businesses reduce their operational spending by creating comfortable buildings that use less energy.

Compare lifecycle costs

Controlling operational costs is much more than choosing the lowest priced equipment. Installing a system with a lower lifecycle cost can help reduce energy and maintenance costs for the life of the system.

Look for systems with higher energy-efficiency ratings to reduce monthly energy bills. Adding efficiency options such as economizers can improve efficiency even more.

Another way to reduce costs is to choose systems that are easy to install – with features such as hinged access panels – to save labor hours. Reliability features including high- and low-pressure switches that protect compressors from unnecessary wear and tear minimize maintenance expenses.

Investigate new technologies

Demand Control Ventilation

Most HVAC systems provide ventilation based on assumed occupancy, rather than how many people are actually in the room at any given time. Installing a Demand Control Ventilation (DCV) system with a carbon dioxide sensor provides an accurate reading of a room's occupancy level. The system then controls the amount of fresh air introduced based on output from the CO2 sensor.

The result is improved energy-efficiency and indoor air quality.


When a building soaks up heat from equipment, lighting and occupants, the warmth may continue to heat the building even when the outside temperature is cool and comfortable.

That's when it is more economical to shut off the compressors and cool using outdoor air. Integral economizers measure outdoor air's temperature and humidity, determining if it is cool and dry enough to keep occupants comfortable. The economizer will then use the outside air for cooling rather than operating the compressors.

Building Automation Systems

Commercial control systems are available that use a single interface to control a variety of equipment and functions. These include sophisticated technologies such as remote monitoring, advanced diagnostics, system setup and alarm reset.

Equipment made by different companies can communicate with each other via BACnet® and LonTalk® protocols. BACnet or LonTalk capability can be installed on rooftop units to let them communicate with the automation system you use.

Investigate a planned replacement program

Most commercial rooftop HVAC systems have approximately a 15-year lifespan. Replacing a unit a few years earlier on a prearranged schedule—before age and wear take their toll—can dramatically reduce energy usage and help avoid lost revenue.

Installing newer, more energy-efficient equipment can reduce energy costs. While savings vary depending on system settings, maintenance, local fuel rates and other factors, today's ENERGY STAR qualified HVAC systems offer significantly higher SEER efficiency ratings.

According to the U.S. Environmental Protection Agency (EPA), the owner of a commercial building can generate $2 to $3 of incremental asset value for every $1 invested in energy performance improvements. Many utility companies also offer rebates for higher efficiency equipment.

*Office of Energy Efficiency and the U. S. Department of Energy

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