An electrostatic filter is an effective and economical alternative to electronic air cleaners. These fit into the existing framework of Water-to-Air Geothermal Heat Pumps. The filter does so by generating its own static charge. They are easy to install with no wiring, duct or sheet metal work required. They are also a permanent, washable alternative that appeal to cost conscious and environmentally minded customers. All filters are Merv 13 and come with a standard steel frame.