How do you know when it’s time to consider upgrading to a new heating system? Obviously if the unit has died or is not working, but it may be wise to consider replacement well before that happens or before costly repairs add up. Many things can greatly affect the longevity and efficiency of your furnace, heat pump or boiler system over the years such as not changing the air filters often enough or not having regular maintenance to ensure proper operation. Additionally, a poorly operating heating unit can negatively impact the air quality in your home.