The HDI Customer Care Center operates from HDI's headquarters in Colorado Springs. From taking orders to resolving customer concerns, our team is happy to assist you with any HDI-related matter. Contact us with questions about products, services, purchases, account histories, or anything else you may need.

[email protected]
800.248.5667 - United States
+1.719.268.0174 - Worldwide


Monday – Friday
9:00 a.m. – 6:00 p.m. ET
8:00 a.m. – 5:00 p.m. CT
7:00 a.m. – 4:00 p.m. MT
6:00 a.m. – 3:00 p.m. PT


Please note that HDI observes the following holidays:

  • New Year's Day
  • Martin Luther King Day
  • President’s Day
  • Memorial Day
  • Independence Day
  • Labor Day
  • Thanksgiving Day
  • Day after Thanksgiving
  • Christmas Day

Online Learning Management System

Frequently Asked Questions