Why is my system not heating? The air is lukewarmUpdated 3 days ago

Depends on the ambient temperatures Heat pump heating capacity naturally decreases as outdoor temperatures drop.

For reliable performance in colder climates, it is strongly recommended to choose a Hyper Heat 
model, which maintains effective heating even at temperatures as low as -13ºF.

Before selecting your heat pump, please consider your region’s typical winter temperatures to ensure the system meets your heating needs.