Request Service By checking this box and signing up for texts, you agree to receive informational messages (appointment reminders, account notifications, marketing and promotional messages such as sales, coupons, seasonal deals, etc.) from Maryland Heating & Air at the number provided. Message & data rates may apply. Message frequency varies. Unsubscribe anytime by replying STOP. Reply HELP for help or email us at service@marylandhvacr.com. Learn more on our Privacy Policy Terms & Conditions page.