Founded as a HVAC e-commerce site in 2002, National Trade Supply has transformed into a group of highly specialized and diverse e-commerce sites and services. They are dedicated to offering products that provide comfort, clean air, clean water, and energy efficiency. Led by their flagship site discountfilters.com, National Trade Supply offers a world class selection of air and water quality products. The NTSupply.com family of websites are backed by industry experts with an obsession for top notch customer service. National Trade Supply sites include DiscountFilters.com, NT-Ice.com, prothermostats.com, dehumidfierexperts.com, iaqsource.com, BathroomFanExperts.com, crawlspace.net, and AprilaireHumidifierParts.com. They have joined forces with over 50 of the nation's top gas and electric utilities to create FilterChange. Together they offer a program that helps save energy by supplying filters and through building consumer awareness of the importance of regularly changing your HVAC filters. Over 400 HVAC contractors use their FilterFetch suite of filter delivery services. In addition to keeping the customer's equipment in top condition, this unique service helps build contractor's brand and insures customer retention. Finally, by collaborating with their OEM partners, they are able to use NT technology and distribution channels to build unique programs for Air and Water Filter manufacturers. These custom programs can include, marketing, fulfillment, call center and customer service. With over 3 million satisfied customers and over 10 years of safe and secure e-commerce transactions, you can shop with confidence at National Trade Supply sites. Be sure to get great savings and discounts on your next purchase by taking advantage of National Trade Supply coupon codes, special offers, and exclusive promotions.