Mail King USA is a full service direct mail marketing firm founded in 2007 and headquartered in Louisville, KY with additional production locations across the country. The company processes millions of pieces of mail every month and acts as a one-stop shop covering design, mailing list acquisition, printing, addressing, postage, and bulk mail drop-off. They maintain a dedicated HVAC heating-and-air vertical at mailkingusa.com/postcards/heating-and-air/ with services focused on generating new leads and re-engaging existing customers for heating and cooling contractors.
For HVAC direct mail and print specifically, Mail King USA produces targeted postcard campaigns with custom design work, neighborhood-level list targeting of homeowners by geography and demographics, and Every Door Direct Mail campaigns that deliver to every address on a chosen postal route without requiring a purchased list. Their model handles the full pipeline from creative through USPS induction, which is attractive for HVAC owners who do not have in-house marketing staff to manage list brokers, printers, and the post office separately. Response rates for postcard campaigns in the trades typically land between 3 and 6 percent, and Mail King sizes campaigns around that expectation.
Beyond HVAC, Mail King serves healthcare, real estate, automotive, and nonprofit customers, which gives them scale and infrastructure most trade-specific print shops lack. The combination of a trade-focused postcard vertical, in-house list data, and coast-to-coast production makes them a strong fit for HVAC companies running recurring seasonal direct mail programs rather than one-off print jobs.