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 runtime?

Runtime shows you how long your Lennox equipment was in "On" mode. It does not take into account how hard your system worked (percent of demand) which depends on whether you have a low efficiency one-stage, mid efficiency two-stage, or high efficiency variable capacity system and other factors. Runtime can be analogous to how much distance a car ran without accounting for its fuel efficiency. If you want to understand how efficiently your equipment ran, see "How hard is my system working?"

For furnace and A/C systems the following Runtime parameters are displayed
1. Heating
2. Cooling
3. Fan

For Heat Pump (HP) and air-handler systems the following Runtime parameters are displayed
1. Heat Pump + Electric Heat
2. Electric Heat only
3. Heat Pump Only
4. Cooling
5. Fan

A dual fuel system (heat pump with an indoor furnace unit) will have the following parameters
1. Heat Pump + Electric Heat
2. Electric Heat Only
3. Heat Pump Only
4. Heating
5. Cooling
6. Fan

When cooling or heating, the fan is running. Fan runtime values represent when the fan ran alone without heating or cooling. This includes when Fan circulation is manually set to "On" and when allergen defender is on.

Electric Heat only runtime includes time in Defrost mode, Auxiliary heat, Emergency heat setting or if the heat pump is unavailable.

The S40 Smart Thermostat operates with Lennox communicating equipment that sends serial communication regarding the Runtime.

You can view runtime information for your system in the monthly email performance report. In the monthly report, you only receive runtime values for the previous month.