July Coupons — 20% Geothermal Filter Ending!

Geothermal Filter's goal is to be a one-stop shop for people looking for a permanent, washable filter for their geothermal system. As a manufacturer, they are uniquely positioned to customize any and all types of air filters. Geothermal Filter started selling filters online about 10 years ago. Over the years, their customers have noticed that their 5 stage low resistance air filters perform extremely well in geothermal and high efficiency installations. Their experience also allows them to design a wide variety of common and very rare geothermal filter sizes. Their filters don't require any electricity. The material they are made of is self-charging. Air passing through them creates a natural static charge.

Look out for special seasonal promotions or holiday sales from Geothermal Filter. During these times, additional coupon codes or larger discounts may be available.