HFS Filter Whistle

A dirty or clogged filter can cause your HVAC system to runharder, which can increase your energy bill or even worse could cost you moneyin repairs. Being notified when to replace your furnace filter on time willallow you to keep your air handler or furnace running properly, saving youenergy in the long run. The filter whistle sounds when your air filter becomes50% clogged letting you know it will soon need replacing.