The Landmark® Rooftop System in Oklahoma City The Landmark® Rooftop System: Greater Performance. More Flexibility.The Lennox® Landmark rooftop system boasts many outstanding features. It’s available in both standard- and high-efficiency units, with a SEER rating of up to 13.0, a 14.5 IEER rating and an EER rating of up to 12.7. And with an optional MSAV® supply fan, the Landmark is up to 27% more efficient1. Saving increase further with this system’s Environ™ coil system, which uses up to 52% less refrigerant and is up to 59% lighter. The Landmark is available in 2- to 25-ton gas/electric and electric/electric and 2- to 20-ton heat pump configurations. Some of its best features include: Field-installed CO2 sensors to decrease CO2 and VOC levels Field- or factory-installed MERV 8 or 13 filters cut back on airborne particles Optional MSAV supply fan reduces humidity ENERGY STAR® designation Interlink compressor delivers better reliability and efficiency Environ™ coil system ensures reliable operation and reduces the time it takes to clean the condensing coil Isolated compressor compartment permits compressor operation to run normally and not disrupt airflow in the middle of performance checks From installation to routine service, Gordon's Service Experts Heating & Air Conditioning in Oklahoma City can take care of all your Landmark rooftop system needs. We’re the experts in this field, so whether you’re looking to buy a new system or only need some repair work, we’ve got you covered. Call 405-432-2197 to find out more. 1 Part load. IEER improvement. Comparing standard 10.9 IEER system to optional MSAV 13.8 IEER system.