FREQUENTLY ASKED QUESTIONS

Perfect comfort is something we want you to experience long after you’ve purchased your Lennox^® product. That’s why we offer a collection of resources that make it as easy as possible for you to get the answers and support you need.

What is variable speed technology and how does it apply to air conditioners?

Variable speed refers to the fan motor inside the air handler - the indoor part of an air conditioner that moves cooled or heated air throughout the ductwork of your home. An air handler is usually a furnace or a blower coil.

Unlike conventional single-speed motors, a variable speed motor runs at a wide range of speeds to precisely control heated and cooled air throughout the home. This is achieved by pairing a variable capacity unit with the S40 Smart Thermostat, which acts as the command center for the system.

Variable capacity systems continuously adjust the heating or cooling capacity from 40%-100% of maximum capacity. The thermostat will maintain comfort by continuously adjusting the capacity of the system. When the demand is below the minimum capacity of the variable capacity system, the system will cycle on and off while running at the minimum capacity.

• A variable capacity system operating at 80% demand will run continuously at 80%. Runtime would be 100% for this case.
• A variable capacity system operating at 40% demand will run continuously at 40%. Runtime would be 100% for this case.
• A variable capacity system operating at 20% demand will run at the minimum capacity of 40% for 50% of the time. Runtime would be 50% for this case.