What type of air filter does All-Weather 120V heat pump use? January 14, 2025 16:28 Updated Our All-Weather 120V heat pumps come with washable MERV2 air filters. Related articles Does the All-Weather 120V heat pump have a drip line? How loud is the All-Weather 120V? Can I use tap water to clean the condensate filter? How do I clean the All-Weather 120V heat pump's air filter? What is the clearance required for proper airflow?